Import Data and Analyze with MATLAB

[@IYoseff]

You are a wonderful teacher, 8 years and countless updates later yet your tutorial still stands!

[@TEAMEXAM24]

thank you sir.. its because of you i am able to complete my final year project.

[@bhartiyasainikjindabad7737]

From where we can get a data file

[@syedmufasir2175]

@Bushra Noor-ul-ain i am getting error can you help

[@JesusLopez-ms6wi]

You sir saved my behind on an Engineering lab, thank you!

[@apm]

🤣Glad to hear that it helped!

[@saptdy]

Thanks a lot for the easiest solution of the problem! From India!

[@rashidkhalil5384]

I am using a Benewake LIDAR TF mini plus and it is working perfectly via UART but I want to use it using TTL converters. I used Termite and the data is unreadable, can you guide me a little on what is the best way to use it with TTL converters?

[@apm]

What type of TTL converter are you trying to use? Here is something I found online: "UARTs transmit one bit at a time at a specified data rate (i.e. 9600bps, 115200bps, etc.). This method of serial communication is sometimes referred to as TTL serial (transistor-transistor logic). Serial communication at a TTL level will always remain between the limits of 0V and Vcc, which is often 5V or 3.3V."

[@rahulkatike6837]

sir, I have 200 x,y coordinates, can i generate a matrix in matlab using those coordinates? from that matrix again I want to generate an Image, Is that possible in Matlab??

[@apm]

Try a meshgrid www.mathworks.com/help/matlab/ref/meshgrid.html I'm not sure about images

[@shrutiawasthi8920]

How can we convert the raw data (802*2) where 802 is no. Of rows and 2 is no. Of columns into an image?

[@apm]

See the 3D Numpy arrays for information on how to do this with Python: apmonitor.com/dde/index.php/Main/PythonNumpy

[@sherinannabraham1918]

sir ,if my text file contains some texts in the starting other than numericals how can I aviod that from reading by matlab (Error using ==> load Number of columns on line 1 of ASCII file C:\Users\Sherin Abraham\Downloads\mag\abg20000212dmin.txt must be the same as previous lines.) this is my error message

[@apm]

Does this help? www.mathworks.com/matlabcentral/answers/27734-how-can-i-skip-lines-when-loading-a-text-file

[@bhaskarojha7100]

thank you very much i was facing the problem since 2 days,now its solved

[@kimberlyn8302]

I am able to run my calculation when I enter in my row value as { : , 2 }, but I want to only use rows in increments of 10. I would assume this would look something like { 1:10, 2} however I keep getting an error message. Please advise! Thank you!

[@apm]

Try something like this: Your_array{1:10:end,2}

[@alec5335]

I was trying to plot the data but it said there was an error in color/linetype, I pretty much copied exactly what you did to get a better feel of matlab, so I'm not sure why it was not working.

[@apm]

Try copying the code from here: apmonitor.com/che263/index.php/Main/MatlabPlots specifically at apmonitor.com/che263/index.php/Main/MatlabPlots?action=sourceblock&num=1 or apmonitor.com/che263/index.php/Main/MatlabPlots?action=sourceblock&num=2

[@apm]

You can get the source files for this problem from: apmonitor.com/che263/uploads/Main/matlab_data_analysis.zip

[@karthia6373]

How to open and view the DAT.file which is in binary image format as well as table text format.

[@apm]

Try imopen: www.mathworks.com/help/images/ref/imopen.html

[@Star-wc2nw]

i want to put data in matlab automatically which i collect them from sensor and at a time by using this data i want to creat a running plot , that means automatically input in matlab and creat a running plot ,sensors will give me data continually and always it will be uploaded in matlab and at a time creating a plot which is running.... how can i do this..?

[@apm]

There is an example here: apmonitor.com/heat.htm

[@RixtronixLAB]

where can I download the code ? thanks

[@apm]

apmonitor.com/che263/index.php/Main/MatlabDataAnalysis

[@mezourachahinez5721]

How Can i download data of ball bearings ( base de données de roulement )

[@apm]

Maybe a Google search?

[@mezourachahinez5721]

Je ne trouve pas la base de données de roulement

[@apm]

@@mezourachahinez5721 Does this help? www.ntnamericas.com/en/website/documents/brochures-and-literature/catalogs/ntn_a1000xi_ball_and_roller_bearings_lowres.pdf

[@EsraaAziz-fk7hn]

Hello, could someone help me how to add the wind uncertainty to my model ?

[@gourabmohapatra9543]

How can we do that using MATLAB guide??

[@apm]

Here is information on importing data with a GUI: www.mathworks.com/matlabcentral/answers/68470-import-data-using-guis

[@panchaminayak9850]

could you please tell me where you got the data? It would help a lot. Thanks!

[@fionacameron5442]

Hi, do you know how you would find the x values which cross a plot at y=0, really struggling! Thanks

[@apm]

+Fiona Cameron, you can do a linear regression (apmonitor.com/che263/index.php/Main/MatlabDataRegression) and then set y=0 and solve for x in the equation for a line: y=slope x + intercept.

[@JohnDoe-l1kmya5s]

Thanks for this video. Thank you for being brief and clear.

[@cihatguleryuz7493]

thanks for sharing.. i have a 3 colomns data. i want to find radius of curvature of this data. Could you help me please ?

[@apm]

Here is information on Regression with MATLAB: apmonitor.com/che263/index.php/Main/MatlabDataRegression

[@hamidrezanaseri3546]

hello, professor, I would like to simulate human detection by hog and Inriaperson dataset .my dataset contains train and test part and in each part have pos and neg what should I do?? how should I load this huge dataset??

[@apm]

I'd recommend loading each file individually and then perform the training and testing / validation. Alternatively, you can load one file and then parse out the training and test data. Here is a related example but in Python: apmonitor.com/do/index.php/Main/DeepLearning

[@rasikadilhani8342]

I am using matlab 2011b and when I try to import my excel file like this it does not work. My excel file contain separate column as date+ time (this is one column Eg. 1/2/2013 12.30am) , Region (text) , and Power (number) . Pls help me to import my excel file to matlab.

[@apm]

Rasika Dilhani You probably need to select in Excel the Save As option and save the file as a txt or csv file. There is also a xlsread function in MATLAB if you'd like to read an Excel file directly: www.mathworks.com/help/matlab/ref/xlsread.html

[@rasikadilhani8342]

APMonitor.com Thank you so much. Now it works properly. I waste too much my time to do this. Your guideline help me to success this matter.

[@kisore7921]

can you explain why i get an error like this? Traceback (most recent call last): File "", line 1, in data[0:4] NameError: name 'data' is not defined

[@apm]

+kisore hari It is probably because the file import wasn't successful. Take a look at the companion video to this one (on Python), starting here: kzbin.info/www/bejne/iqKZo3aNhcmLpbMm38s This is a MATLAB tutorial but you appear to be using Python.

[@Rainstorm121]

Thanks sir. After I load my .mat file into the editor. How can I read each variable column in my dataset?

[@apm]

disp(x(:,2))

[@tsehayenegash8394]

How can I open huge .nc data like this one

[@apm]

I'm not familiar with .nc files. If they are text files then it shouldn't be a problem.

[@muqtasidaliawan]

Thank you sir. I have 6000-36000 values in form of rows. Each time i copy data from excel file to matlab, some of values are shown as NaN, how can i change NaN to numeric values... The data is large and i can't even put every value by hand. Is there any solution?

[@apm]

You can type Ctrl-h to open up the dialog box for Find and Replace.

[@muqtasidaliawan]

@@apm Thank you. So I have to change each value separately?

[@apm]

@@muqtasidaliawan no - you can select "Replace All"

[@muqtasidaliawan]

@@apm Thank you so much for your reply. It will help. 👌 👍

[@Truthonlyify]

Thank You very much for brief and simple presentation

[@gv6980]

Sir, can you please suggest any project that I can start in ML!?

[@apm]

Here is an example to help get you started: apmonitor.com/do/index.php/Main/DeepLearning

[@gv6980]

Oh soo much Thank you!!!

[@meghabillure2612]

sir, suppose i have single column of 16 values, if i want to represent these values as 4x4 matrix, then how to do it..?

[@apm]

I'd recommend the reshape function: www.mathworks.com/help/matlab/ref/reshape.html

[@BlinkTF2]

hello! i've been trying to import some special functions that my teacher gave me to practice Matlab, but i've been struggling to load the functions into my workspace. The error says that ""Number of columns on line 1 of ASCII file (my file directory) must be the same as previous lines."", and i feel like i am loading the functions badly because Matlab thinks they're supposed to be ASCII files when they're not: how do you think i could fix this? is that the actual problem or is it something else? thanks in advance, have a nice day!

[@apm]

+BlinkTF2, for functions you should use the addpath command. Place your functions in a directory and then include something like addpath('c:/my_functions'). You should then be able to use the functions in that directory.

[@joezakarya7293]

Hello sir , i use import tab from the Toolstrip , but my file contains both texts and numbers so i have to customize the selection by A , B , C ,... rows , is there a way to save this customized settings so i dont have to do it all over again every time i import data from these text files , as those texts files all have the same format so it will be easier if i could save my selection settings , Thank you

[@apm]

+Youssef Zakaria, one way to avoid this is to import the data as a cell array and then you don't need to differentiate between numbers and text. www.mathworks.com/help/matlab/cell-arrays.html

[@tareqatiany1890]

hello, how can I generate multivariate random data add percentage of contamination data(outliers)

[@apm]

+Tareq Atiany There is an example of noise, outliers, and drift for contamination of data on the dynamic optimization course web-site here: apmonitor.com/do/index.php/Main/DynamicData (see the example at the bottom).

[@angelabremi1527]

Hello, I have a zipfile(named proposal) that contains 3 different devices and each device has a list of voltages from (0 volts - 10 volts) and each of these voltages has a very long list of currents(numbers only), how can I use the data from all 3 devices(device1, 2 & 3) to calculate the Autocorrelation for each signal, calculate the Fourier Transform of the Autocorrelation for each signal and the Fast Fourier Transform for each signal. With time = 10^-15. Everything I tried hasn't worked. Thanks.

[@apm]

I recommend that you try this function for autocorrelation: www.mathworks.com/help/econ/autocorr.html I also like to use the svd function to determine the degree of correlation between the signals. The relative magnitude of the singular values is the thing that you want to use to determine if the signals are unique versus just scaled values of each other. Here is help on the fft function: www.mathworks.com/help/matlab/ref/fft.html

[@mounicapandiarajan6236]

How to do pca using matlab

[@apm]

www.mathworks.com/help/stats/pca.html

[@aniruddhasharma5738]

what if it is in .dat file format?

[@apm]

As long as it is text, you should be able to import it. Here is information on changing file extensions: kzbin.info/www/bejne/j52xapSubN52ZqM

[@hardikvaniya4787]

How to creat data file?

[@apm]

You can get the data file from apmonitor.com/che263/index.php/Main/MatlabDataAnalysis An easy way to create your own is to use Excel and export as a CSV file.

[@nickkeboi]

Please, am working on permeability calculation using matlab, how do I create the codes I need to work on this, having my datas

[@apm]

+Chinomso Uche do you also have equations or just data? You can either use a data driven empirical approach where the equation form is determined at the time you perform the regression (e.g. artificial neural network), a correlation that is based on first principles (e.g. ab initio calculations), or a combination of the two.

[@nickkeboi]

+APMonitor.com I want to run a simple model to simulate the permeability measurement using a given parameters n data. Some of the parameters are constant since I ran the experiment on one core sample but for five time where I had to Chang the flow rate which ended up having a change in the value of the change in pressure and the permeability. So which is the best way to model this on Matlab, am to compare the real values gotten from the experiment and the simulated values from the Matlab.

[@momenabdulrazzaq8861]

hi.i am very new to matlab my problem is how to divide large amount of data into 4 group the data contain 181*500 .please i need your help

[@apm]

+Momen Abdul Razzaq You could do it with the following commands: group1 = data(1:end, 1:100); group2 = data(1:end, 101:200); group3 = data(1:end, 201:300); group4 = data(1:end, 301:500); Just adjust the row or column ranges to select the appropriate data. You can also shorten the part "1:end" to just ":".

[@kavithasenthilkumar4533]

Sir I m using matlab online how can extract my excel file

[@apm]

Does it work to upload your Excel file to drive.matlab.com so that you can import it?

[@94afifah]

Hello sir, I have a problem with importing data. Let's say I have a 5 set of data. Each data contain 50 values. so how I am gonna do to create a benchmark and combine it in a workspace for each set?

[@apm]

After you import the data files, you can combine them with combined_data = [data1 data2 data3 data4 data5] for column oriented data or combined_data = [data1; data2; data3; data4; data5] for row oriented data.

[@ateflaiche4436]

How Can i import Data file into simscape multibody, thx in advance Dear

[@apm]

I'm not sure about that. Maybe check with mathworks?

[@ateflaiche4436]

@@apm i'm sorry for my question, it is not clarify , i extracted mass and striffness Matrix from Ansys workbench (.txt) files format and i want to import them to MATLAB, how Can i do it plz?

[@bashirmuhammadjibril3279]

It is an enterprising video for me. But I have a separate problem using data collected to detect malware. How can I input this series of data to SVM in order to generate a result?

[@apm]

Bashir Muhammad Take a look at the SVM documentation here: www.mathworks.com/help/stats/svmtrain.html It appears that there is a particular input format that is required.

[@rayho_]

thanks for the info! how can I implement a search feature that would bring up the value I want to associate with each name given (say, gene accession number with the name of a gene). I'm sorry if this is very simple, but I'm brand new to programming!

[@apm]

+ray ho, look at functions such as strfind and strcmp. Once you find the name, you can look up the associated value or use the index to go onto the next step.

[@Islamallam99]

sir, when i plotting there is an error occurs, "Vectors must be the same length." ps: i took 6 values of data with the all column of time.

[@rrc]

Islam, you may need to transpose one of your data vectors so that you have the same number of rows. You can see the size of each thing you are trying to plot with the "size" function: www.mathworks.com/help/matlab/ref/size.html. Make sure that x and y have the same dimensions. You can use the command "hold on" to plot multiple data sets on the same plot.

[@slimjim_l7936]

Try adding an ‘ to the vector. It’s probably because one is a column and one is a vector

[@muslimgirl66]

how can I use POS tagger and SentiWord in MATLAB for opinion mining/TextMining and feature extraction??? dataset is in excel extracted by twitter..

[@apm]

This is easy with Python or NodeRed but I haven't tried it with MATLAB. Here is another question that you may want to follow to see if Mathworks provides an answer: www.mathworks.com/matlabcentral/answers/130100-sentiment-analysis-and-opinion-mining

[@ramezalotoom7911]

Do you have an idea for source coding with n gram in matlab?

[@apm]

Sorry, I don't know about that one.

[@syedmufasir2175]

Sir where can i get that dataset of Fault detetcion in WSN >>>

[@apm]

Sorry, I don't have datasets for Wireless Sensor Networks.

[@ibrahimmusa9348]

I am very new to matlab, my difficulties are how to import data from excel to matlab and running a code to do analysis like PCA ,LDA etc.please I need your help....thanks.

[@apm]

+Ibrahm Musa Here is a link on LDA: www.mathworks.com/matlabcentral/fileexchange/29673-lda--linear-discriminant-analysis and PCA: www.mathworks.com/help/stats/pca.html

[@apm]

One other resource that may help you as a beginner is to visit the Matlab section of my course on computational tools apmonitor.com/che263 Please navigate to the Matlab section for introductory videos.

[@deeksharai2563]

Am doing my project on import analysis so that I need find reasons for fluctuations in imports ... Whether I can find using multiple regression

[@apm]

There are multiple courses that teach regression concepts (basic to advanced) here: apm.byu.edu I recommend starting with this material: apmonitor.com/che263/index.php/Main/MatlabDataRegression

[@sandeeptamber9525]

You saved my life

[@maneldjebbar7864]

hello, please help me am hopeless its my first time to work with matlab please how can i load my database on matlab (my application is to classify this data using decision trees in matlab) i put my data in text file or execl file??? and how do i load it in matlab for machine learning ??????????

[@apm]

+toukal manel A text file is probably the easiest method to import data. You can also access the database directly: www.mathworks.com/products/database

[@mahfouzmahfouz3408]

thank you sir . but i want to know how can i make the ANN takes the output of GLCM and make a database for ANN

[@apm]

I recommend that you take a look at the ANN toolbox in MATLAB and the commands related to graycomatrix.

[@mahfouzmahfouz3408]

okay thanks sir

[@nickname1417]

Hello, I am doing ANN, because of Mu amount data training Process will stop after 2 epoch only. how I can deactivate Mu or other training parameters? Thanks

[@apm]

+Far id This video doesn't deal with ANNs so I'm a little surprised that you asked it here. It sounds like you need to adjust the tolerance for your solver. Are you using the ANN toolbox?

[@nickname1417]

+APMonitor.com You are right, sorry about differences. I need a syntax or comment to add on ‘advanced script’ of ANN toolbox that totally deactivate a desired training parameter like Mu. Thanks again

[@apm]

+Far id No problem - best of luck with your efforts.

[@namasteygermany9867]

Hello sir, I have a problem with multiplication as I have to multiply a=101x1 matrix with b=202x2 matrix in the form of a(1,:)*b(1:2,:) a(2,:)*b(3:4,:) and so on for that I have created 4 loops for n = 1:1:202 for l = 0:1:100 for m = 0:1:100 for k = 1:1:101 mm(n,:) = a(k,:)*b((l+1)+m:(l+2)+m,:) but I am getting an error 'Subscripted assignment dimension mismatch.' Could you please help me with this?? Thank you

[@apm]

The inner dimensions of the matrix must agree for multiplication. You can do the multiplication yourself or let MATLAB do it for you (much more efficient). You can even take a slice of a matrix for multiplication. Here is an example: clear all; close all; clc A = rand(101,1); b = rand(202,2); MM = A' * b(1:101,1); disp(MM)

[@namasteygermany9867]

Thank you Sir.

[@namasteygermany9867]

How to multiply a complex matrix with its conjugate in matlab. I am trying the normal function of a*a' but not getting the desired result

[@sunlight7498]

How I can convert coe file ( generated by ip core in fpga) to image file by using matlab??

[@apm]

Sorry, I don't have experience with COE files.

[@bhavikpatel2387]

Can you explain that if i want to find equation of the plot which i have plotted then how can i do that???

[@apm]

Here is information on regression: apmonitor.com/che263/index.php/Main/MatlabDataRegression

[@mictorioz9580]

Sir, is there any way by which I can use or export the plotted graph as a signal in Simulink?

[@apm]

Mehfooz Ali, here is some help on importing data into Simulink: apmonitor.com/che436/index.php/Main/ProjectProgramming (see the first example).

[@soumendrasingh1]

How to handle a time series data with occasional data gaps? for example how to make a weekly average of monthly data file, when data is missing...a loop will land into errors ...please help

[@apm]

+soumendra singh One way to do this is to indicate the missing data as NaN values. Then you can apply the nanmean function to average over the data, ignoring the NaN data (www.mathworks.com/help/stats/nanmean.html). If you don't know if a particular number is missing or not and want to do this as a loop, then use the isnan function to determine which elements are numbers (www.mathworks.com/help/matlab/ref/isnan.html)

[@madhumithaj7394]

Sir what if i want to process the data in time attribute.Like time has a set of data ,in which if anyone of the data is higher than some threshold value print some information.

[@apm]

This may help: www.mathworks.com/matlabcentral/answers/29099-importing-formated-time-data-into-matlab

[@musabara6269]

Sir, my dataset contains 6 columns and 19 rows in CSV format. But whenever I import it to MATLAB it will turn the rows to columns and vice versa. How can I make it to read the data? Thank you Sir.

[@rrc]

you can transpose the data after importing data = data'

[@musabara6269]

Thank you Sir. If I have further question, I can still ask.

[@shahabanjum7249]

i have 1x1099 double value in 'sg' variable max value 39.2885 and min 30.1231 how i can normalized it b/w 0 and 1 can u please help me with that i will be thankful

[@apm]

You could normalize with something like this: x = 100.*randn(1,10); x_norm = (x - min(x)) / (max(x) - min(x))

[@muhammadaskari5793]

sir when i try to load the data it gives me the error

[@apm]

You can get the program and data file from apmonitor.com/che263/index.php/Main/MatlabDataAnalysis

[@muhammadaskari5793]

Thank You Sir ☺

[@z.a7130]

Hie Sir, Can I have your email address ? My question to you is, if I need to know the position of sensor 2, row 5. What will be the command for that ?

[@apm]

It is: sensors(5,2)

[@noramiraabubakar8583]

TQ so much, I am calculating ATC Power Flow system, my code blocked given an indication related mpoption.m function, could u please lead me to right solution , TQ

[@apm]

+nor amira abu bakar I'm not familiar with your code. Maybe a paper like ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=6559645 can help you.

[@ateflaiche4436]

Nice work sir!! Can you tell me how Can i import striffness Matrix in MATLAB , when i type import('Matk.txt') i have all the Matrix parameters in the same column!!!

[@apm]

Try the reshape function: www.mathworks.com/help/matlab/ref/reshape.html

[@zulkifliarsyad3411]

cannot load file because have Unknown text on line number 1 of ASCII file..can u help me??

[@apm]

You may have headers that interfere with the numeric value read. I'd recommend either deleting the header row or else looking at a forum post where it discusses reading a text file with headers.

[@alaanghazi292]

I want insert data to neural network as two dimensional ,so for example i have two group T and B .T have one raw and 10 column and B also same , so i want both of this data become as one input but 2-Dimensional and target also it will be same process .my question are neural network accept (2-D input , 2-D target) and if it's accept how i can do this process in matlab ,thank you for your help.

[@apm]

Alaan, check out the ANN (artificial neural network) toolbox. It will help you fit a model. However, you may find that an ANN model extrapolates poorly. With such a small system (2 x 2) you may find other forms that extrapolate better such as a first principles model or better empirical approaches. Make sure you keep a separate data set for validation.

[@shylendersingh1682]

sir where i will get eeg data.....any site for text format

[@apm]

Here are instructions for building your own EEG: www.instructables.com/id/DIY-EEG-and-ECG-Circuit/ or here are some publicly available datasets: sccn.ucsd.edu/~arno/fam2data/publicly_available_EEG_data.html The data appears to be in an rdf format and you'll need a program such as sccn.ucsd.edu/wiki/A01:_Importing_Continuous_and_Epoched_Data to import it. If you can convert it to a text file then you can use MATLAB to manipulate the data or maybe use a program such as EEGLAB for MATLAB: sccn.ucsd.edu/eeglab/

[@mashitahcherazali7895]

Thanks sir for the great explanation. Btw I really need your help, actually I got data file in .mat format which are 1 input data (4000x1) and 2 output data (4000x2). How can I use these data in order to get the transfer function model? I already used the 'iddata' command, but some how I'm not sure how to determine the number of pole and the number of zero.

[@apm]

Here is information on obtaining a model from data: apmonitor.com/do/index.php/Main/ModelIdentification

[@طارقمحمد-د7ج6ق]

In the medical field how to create a data database for the disease

[@apm]

+طارق عطية There are some great resources in MATLAB for disease modeling and parameter estimation from data. Check out xps.apmonitor.com/wiki/index.php/Main/SBML for some of our recent work with the Scientific Biology Markup Language. You may also want to look at other model forms from your data such asLewis, N.R., Hedengren, J.D., Haseltine, E.L., Hybrid Dynamic Optimization Methods for Systems Biology with Efficient Sensitivities, Special Issue on Algorithms and Applications in Dynamic Optimization, Processes, 2015, 3(3), 701-729; doi:10.3390/pr3030701

[@AyushSharma-hm9bm]

Sir, I need to implement a similar operation. I need to take the text file, where the text file includes some set of rows for a particular date and some rows for some other dates and so on. Now, i need to take the data corresponding to the required data (the user will enter the date) Please note that the first column of each row contains the date. The Matlab needs to compare first column of each row and if the first column data ie: date of the current row matches with the date entered , then this row will be copied to the a new test file. The code will do this process till the end of the text file, and finally, I will get the required data text file only. Kindly response Regards

[@apm]

+Ayush Sharma, you may need to use a different method such as textscan to read in the date information: www.mathworks.com/help/matlab/import_export/import-formatted-dates-and-times.html Once you import the data, you can use one of these methods to lookup the row: www.mathworks.com/matlabcentral/answers/218033-efficient-method-for-finding-index-of-closest-value-in-very-large-array-for-a-very-large-amount-of-e

[@kwesi4812]

I am a first time user of matlab and am trying to use Matlab to analyse torque at the ankel of the leg after conditioning it with some stretching protocols and using a dynamometer to measure and collect data of force at angle of 5,10,15.. How do i calculate the torque at sey 5deg?

[@apm]

Check out the optimization course material at apmonitor.com/me575 under the application project section. There was one project that was similar to yours at apmonitor.com/me575/uploads/Main/2013_Knee_Simulator.pdf

[@bermalharman2454]

I am using matlab 2011b I add to spm in to the matlab but spm not run give me error constatntly error : "undefined function file_array for input arguments of type char" I changed file name this time matlab didnt find spm and I delete all spm file , download and back to add but problem still constient How can I check this problem?

[@apm]

I'm not familiar with the SPM package - is it for analysis of brain images? It appears that the versions available here www.mathworks.com/matlabcentral/linkexchange/links/977 have newer versions (SPM8 or SPM12) - maybe try the newer versions.

[@bermalharman2454]

APMonitor.com thank you for attention and for helpful videos ☺️

[@NehaGupta-qg5cv]

sir can you suggest any reference from where i can get that data

[@apm]

+Neha Gupta, here is the top Google search for your request: sccn.ucsd.edu/~arno/fam2data/publicly_available_EEG_data.html

[@evan_still_playz]

sir if i had two different sensors data which are sampled at different rate and i want to plot in single graph i want calculate difference??

[@apm]

+Saeed Muhammad, you have a couple different options. (1) create an interpolation of your data and compare the functions that fit your data (see apmonitor.com/che263/index.php/Main/MatlabDataRegression or www.mathworks.com/help/matlab/ref/spline.html). (2) compare nearest data points by finding one value that is close to the time in the other list (see stackoverflow.com/questions/8089031/how-do-i-find-values-close-to-a-given-value)

[@evan_still_playz]

thanks allot sir for yours reply

[@yaminajouili2987]

using matlab 2012a and I need install compiler c++ under matalb.Can you help please!!Hi,I am

[@apm]

There are many good resources online such as www.mathworks.com/help/matlab/matlab_external/choose-c-or-c-compilers.html

[@engr.ibrahimabdul-alim7386]

Hello Prof, the dataset i have are 45x11 dataset which i want to modelled it inn matlab using linear and non linear regression, i need your help with a tutorial that i can be able to modelled it. Thank you

[@apm]

+ABDUL ALIM IBRAHIM How many inputs and outputs do you have in your data? If you only have 1 or 2 outputs (and 10 or 9 inputs) then it may be possible to model. With only 45 data points, the results may not be very good because there can be more unknown parameters than data points. Is there a possibility to get more data?

[@engr.ibrahimabdul-alim7386]

+APMonitor.com Thank you for your responce sir, it is possible for me to attached the data for you to see it yourself? its a data collected from ABU, Zaria, teaching Hospital for Short Insulin Tolerance Test, I want to identify the model from the data to analyse Glucose-insulin kinetics. Thank you

[@apm]

+ABDUL ALIM IBRAHIM Your data looks very interesting. You may be able to do an analysis similar to the one found here: www.ncbi.nlm.nih.gov/pmc/articles/PMC2628038/ We also have some mechanistic models for Type-I diabetes but I'm assuming that the data you sent were for Type-II diabetics. What is the dosage of insulin delivered as part of the test? You need this information as well to develop a model from the step test data.

[@namasteygermany9867]

Hello again could you please tell me that why there is a different in answers when I am converting a vector in complex form one by one with that when I am using a for loop to do the same type of calculation. Individually I am getting its real and imaginary part but when put in a loop its showing only the real part and because of this my further calculation is affected.

[@apm]

+Shikha Singh, here are some functions that may help you with imaginary numbers: www.mathworks.com/help/matlab/complex-numbers.html I'd recommend that you enter debug mode and step through the first couple cycles of your loop to have a more detailed look at what is changing.

[@namasteygermany9867]

there is an error in this statement E = [elec(:,4)+elec(:,5)*i elec(:,6)+elec(:,7)*i elec(:,8)+elec(:,9)*i]; instead of giving ans in terms of a+bi, its is giving only a how to overcome this problem?

[@apm]

Shikha Singh, is this statement in a loop? Your syntax looks correct to me. One problem could be if "i" is defined as your loop variable then you are redefining the definition of an imaginary number. Either use a different iterator in your "for" or "while" loop or else switch to "j" for your imaginary number.

[@namasteygermany9867]

I have to store 80 values in an array with 10 rows and 8 columns using statement poyndb = 10*log10(modu) - 3 array_poyndb(k) = poyndb; and then finding average using array_poyndb(k) = poyndb; could you tell me is there a problem in this statement?

[@ameraabdullah5818]

good day, how to i extract all data from fis.file into matlab because i want so plot a graph based on the data that i collected. In that fis file there will be around 10k data. thats why i want to extract them to matlab so that i can do the plotting. please help me for my final year project

[@ameraabdullah5818]

im sorry, its not a fis file but .mat files

[@apm]

Here are instructions on fis files: www.mathworks.com/help/fuzzy/readfis.html

[@apm]

You can load a mat file with the command: load(myFile.mat). It will load the values into your workspace. www.mathworks.com/help/matlab/ref/load.html

[@flowerwht]

I don't know why loading isn't working for me ; u did it with text file let me see if that works ..

[@apm]

What type of file are you trying to load?

[@namasteygermany9867]

Sir I am not able to load my text file into Matlab. I have to perform poynting vector calculation on matlab using electrical and magnetic fields real and imaginary part. Could you please help me on this ?

[@apm]

A common error is that the text file has a header and is not just numbers. You may want to try textread (www.mathworks.com/help/matlab/ref/textread.html) or else remove the headers.

[@namasteygermany9867]

I removed the header just kept the numbers in the text file, but its showing like this ??? Error using ==> load Number of columns on line 1 of ASCII file C:\Users\SHIKHA\Desktop\poynting\Monopole800_FFefe.txt must be the same as previous lines.

[@apm]

That is a strange error because line 1 doesn't have any previous lines. I'd recommend that you open the file with a program such as Notepad++ and turn on the option to view all characters. Make sure your numbers are separated by commas or tabs as well.

[@namasteygermany9867]

That error has gone. Could you please tell me to how Plot module and phase in polar coordinates of poynting vector? Which commands to use?

[@apm]

Shikha Singh, check out the programming class at apmonitor.com/che263 There is a section on generating plots in Matlab.

[@noobality3890]

hello! i need your help.. how i can contact with you?

[@apm]

As you can imagine I get a lot of requests like this. I support apmonitor and Gekko applications but don't have the time to support all of the Matlab and python questions. I recommend that you post to a public discussion page to seek an answer for your question or else contact MathWorks.

[@hamzaalbaze8926]

Thank you but how to select aset of primary dependent variable and plting four graohes of different secondary dependent variable derived from the set of primary dependent variable

[@apm]

hamza albazr One thing that I didn't show in the tutorial is how to create an inline function. Here is one example of plotting derived variables where the dependent variables may not have been known before the function was defined. y = @(t) t.^2; % create a function y(t) = t^2 t = linspace(0,10); % create a vector t with 100 points between 0 and 10 plot(t,y(t)); % create a plot with t and y(t) In the case of the tutorial video, you could select a sub-set of the times (first 5 rows) with time = sensors(1:5,1), s1 = sensors(1:5,2), s2 = sensors(1:5,3), s3 = sensors(1:5,4) and then an average with avg = @(v1,v2,v3) (v1+v2,v3)/3. You should be able to plot with the command plot(time,avg(s1,s2,s3)). Please let me know if this doesn't answer your question or if you have another question.

[@afefsaidi9803]

Please how can i import data from edf file ?

[@apm]

+saidi afef, here is a MathWorks file exchange contribution for EDF file reading: www.mathworks.com/matlabcentral/fileexchange/31900-edfread

[@afefsaidi9803]

ok thank you

[@ziedmahjoub3797]

Thanks for showing us how we can analyse data with Matlab ! I would appreciate if you give me an explanation about how we can import data online from an SQL server ! Thanks

[@apm]

+Zied Nouir Mahjoub I don't have a video on SQL statements but here is some information online: www.mathworks.com/help/database/run-sql-query.html and www.mathworks.com/help/database/ug/create-a-query-using-a-matlab-variable.html

[@Earth098]

This helped me a lot. Many thanks!!!!!!!!!!!

[@reubenroy]

Thank you kind sir. You have made easy a daunting task

[@jeyaneepan]

how van i download this data_file.txt. i can easylu follow your instruction.

[@apm]

It is available from apmonitor.com/che263/uploads/Main/matlab_data_analysis.zip

[@jeyaneepan]

thanks for response

[@chandinisaikumar2736]

how can I open a DOT file in matlab Sir

[@apm]

You can open any file in MATLAB with fopen.

[@hahashah]

how did u get those data?

[@apm]

+shahfiq amran, the data in this example (apmonitor.com/che263/index.php/Main/MatlabDataAnalysis) is from an industrial application in offshore oil and gas.

[@hahashah]

really appreciate it...but do you know how to extract a web url or features to become those data.? my project is detection of phishing web pages using ANN...really appreciate if you could help me...

[@apm]

+shahfiq amran, I use urlread and then parse the data in my APMonitor toolbox. You can download it from apmonitor.com/wiki/index.php/Main/MATLAB.

[@hahashah]

do you happen to know how to extract url to those data?

[@apm]

It is in a zipped archive posted to apmonitor.com/che263/index.php/Main/MatlabDataAnalysis Specifically, download the file apmonitor.com/che263/uploads/Main/matlab_data_analysis.zip and unzip the contents to see the data file and script.

[@jrM5492]

4:38 avg=mean(sensors,2); what is the 1st dimension then?

[@apm]

The first dimension is the row dimension (sampling instances in time for this case) and the second dimension is the column dimension (redundant sensors at one particular time point). We are taking the mean of the sensors at one particular time point with mean(sensors,2).

[@dragoon1983]

Thanks dude. It really helped me

[@ankitknight6304]

can i forcast the data if i have a database in excel ?

[@apm]

Yes, you can import data from Excel with 4 different tools or functions that you can use: 1. Import Tool: Import a worksheet or range to column vectors, a matrix, a cell array, or a table. You can generate code to repeat the operation on multiple similar files. 2. readtable: Import a worksheet or range to a table. 3. xlsread: Import a worksheet or range to numeric and cell arrays. 4. importdata: Import one or more worksheets in a file to a structure array. For forecasting, you'll want to generate a model from the data. The type of model that you train (classifier, artificial neural network, time series model, etc) will depend on what you are trying to forecast. See additional information: www.mathworks.com/help/matlab/import_export/ways-to-import-spreadsheets.html apmonitor.com/do/index.php/Main/DataSimulation apmonitor.com/do/index.php/Main/ModelIdentification

[@ankitknight6304]

thank you so much for replying so quickly. i am doing this little project in college where i want to forecast the wind power production, so i have data of 24hrs*31days of a month in excel. so now i need to forecast the wind speed of next day . which tool can be used for this problem and i am fairly new to matlab, so what should i refer to get the coding done. thank you so much ! cheers !

[@apm]

There are lots of examples online for wind speed forecasting such as www.mathworks.com/matlabcentral/answers/130178-wind-speed-prediction-using-arima-model (empirical approach) and stratus.astr.ucl.ac.be/textbook/ (atmospheric modeling approach). From your question, it sounds like you are most interested in an empirical approach so I'd recommend the first link.

[@ankitknight6304]

thank you so much for your time and effort...i'll go through the link.. thank you !

[@yuxiangswjtu]

Thank you very much for such a useful and neat tutorial.

[@apm]

Thanks!

[@brian_mcnulty]

Slick demonstration.

[@apm]

Thanks!

[@SonGoku-rl9qf]

great video. Thank you sir.

[@engr.ibrahimabdul-alim7386]

I found this tutorial very interesting, i really need your help on how to import and excel data into matlab and develop a linear, non linear regression model and ANN (Artifial neural network) with the imported data. Thank you looking forward fro your responce

[@apm]

+ABDUL ALIM IBRAHIM I don't have a tutorial on ANNs specifically but here are some on linear and nonlinear regression: apmonitor.com/che263/index.php/Main/MatlabDataRegression

[@NehaGupta-qg5cv]

sir can i get meditation based EEG data?

[@apm]

+Neha Gupta, sorry, I don't have that data.

[@nehasinghjaswal]

Thank you for this wonderful video Sir. I would appreciate it if you help me out with the following problem solution. After loading the dataset I want to select only the rows in which Response time is 3 cost is

[@apm]

You could create a loop and select only those rows that have that condition. Alternatively, it is easy to do this with Python (Pandas package): apmonitor.com/pds/index.php/Main/CleanseData