HP PRIME 03 - Variables and Systems of Equations.

[@jesuisravi]

I appreciate your taking the time to make these tutorials.

[@rolinychupetin]

Glad you like them!

[@phrack9998]

Great video.

[@sykromsmile6303]

Great video

[@sykromsmile6303]

Very nice, great

[@bolleke702]

That's a lot of variable assignments... On the PC, that's ok, but on the machine itself it's a bit cumbersome, especially compared to an RPL-machine :-) Thanks for all the nice helpfull videos though!

[@marlonhermilio]

muchas gracias señor rolliny. Dios lo bendiga

[@rolinychupetin]

Amen to that. Thanks. No better to appreciate one's work than that.

[@dooda1193]

genius sensei

[@velocity6509]

Love your videos series on hp prime so far. it helpful in my electronics course but i am confused on what the difference between := is and sto> and when to use what

[@rolinychupetin]

They are equivalent. I use STO> when I have forgotten to pretype the variable that will contain the value in the previous line. As when I compute something and then I realize that I may need that value several times in the future ... THEN I use STO> If I know from the beginning that I will be using the value later in the question, I can type a:= expression. I hope this helps. Thanks for posting.

[@pausalvado7912]

You saved me, thanks brother

[@rolinychupetin]

Glad I could help

[@kristianrigasz8737]

Thank you very much for a very helpful video. I have just one tiny question, once you stored a value in a real home variable (let's say "A"), how could you delete its value?

[@rolinychupetin]

If you have used one of the predefined variables, like A B C D ..., to clear its value you only need to store zero in it. The variable cannot be destroyed, just rewritten. However, if it is a variable that you created, perhaps with a name 'radio:=5', you can destroy the variable completely with the command purge(radio). If you want to destroy a group of variables, let's say the variables 'Iao', 'Vcb', and 'Pout', you just list them between curly brackets like this: purge({Iao,Vcb,Pout});

[@powertube5671]

Excellent lecture, professor. I have no "user" button. I found, in order to get that list, I type vars->CAS, then I get the same listing. It took a bit of poking around. I don't know if there is a firmware update.

[@rolinychupetin]

The "USER" soft button appears when you have user created variables. Otherwise it is not there. Sorry for the long delay in replying. I usually wait for the end of classes to respond, which is in a week. Thanks for the positive feedback. Sincerely.

[@vincent7553]

Great video, thanks. A little question, why do you choose to use HP prime rather than TI nspire CAS(hp 50g rather than ti84)? I prefer nspire since it contains a full keyboard.

[@rolinychupetin]

Choosing the right calculator for you is like choosing the right shoes or clothes. You pick the one that really works for you. The HP-PRIME works for me. I like a slim and very portable machine. I like that it has rechargeable batteries. I like that its CAS is right out of the mind of the Canadian designers and proponents of Maplesoft. It is a personal choice. I put my calculator to the test under very demanding circumstances, environmental and operational, the HP-PRIME seems to keep up with me. If a full keyboard is a must for you, by all means, the HP-PRIME is not a good choice for you. Thanks for posting. I truly appreciate your balanced and praiseful input. Long life to all calculators, HPs and TIs! (I started doing science before calculators were ever released, in the days of log and trig tables). Also Casios, and SHARPs (I still have one of those).

[@jsurinderveygal561]

Thank you kindly. If you have time, on on differential equations, I would be very grateful

[@rolinychupetin]

I briefly review first and second-order O.D.E., in some of the videos on the channel. I believe they are in the one on first order circuits and in the one on second-order circuits, but with so many videos I've forgotten.

[@TreyVaswal]

BUTTSLV? 😉 Helpful video(s) though, thank you.

[@caulist]

Bom vídeo. Compensa trocar HP 50g pela prime? Tenho todos seus vídeos com a HP 50g usando pra cálculos. A prime são poucos. Os programas são diferentes. A 50 g tem 2100 funções embutidas. A prime não chega a 400.compensa a troca?

[@rolinychupetin]

Dear Mr. Claudio, Before I had the HP-Prime forced upon me by the market, I would have said no. But after a year of using the HP-Prime (I have three HP-50gs and two emulators for the 50g one on my iPhone and one on the PC) I find myself using the Prime exclusively. I hope that helps to answer your question.

[@caulist]

Thanks for the answer. I hope one day you will redo the programs you have in your videos for hp50g for hp prime. I could not translate them from 50g to prime.grato

[@kingtyrael13]

When i try to input the lower cases like when you do the Rb:= it says you want to create the new variable? and once i say yes sintaxis error always when i try to put lower case to a variable

[@rolinychupetin]

At some point, HP should separate "system" variables from "user" variables, but until then, we face the annoying "syntax" error message when we try to create a variable with a name that corresponds to a predefined function in the calculator. Some names are obvious, like "sin" or "cos", but some more obscure function names that we never use may take us out for a loop. For instance, asa, is a function name predefined within the triangle app. In those cases, I just add one more character to the name and that usually does the trick.

[@kingtyrael13]

I see, thank you so much for such an useful guides and personal help!

[@Wondermultiverse]

I can't seem to find the colon on the hp prime.... Can you point me to it? thanks!

[@rolinychupetin]

ALPHA [+]

[@leandroandre1004]

Do You know if it is possible calculate multiple equation solver (MES) like others HP48, HP49 and HP50 in HP Prime?

[@rolinychupetin]

I'm sorry, but I am not familiar with this MES that you mention in the HP 50. Can you elucidate, please.

[@bolleke702]

It's not possiple like in the HP-48-50 series

[@JuliusSP1]

i dont understand why he assigned the varialbe results to L0.

[@rolinychupetin]

I would have to watch the video again to be sure what you are asking, but here it goes. The function 'solve' returns a list of solutions. The HP Prime has predefined variables L0, L1, L2, ... as variables that can contain (can be assigned) lists. So I assign the list of solutions that comes out of 'solve' to the list variable L0 for future reference.

[@pssmrteo]

I tried running RR(2,7) in RPN mode and got syntax error. Any way to work around this?

[@rolinychupetin]

Even if I supported RPN as the best way of communicating with all HP's, from the 35 up to the 50g (and I have had each and every one of them over the years) ... for the Prime, I prefer Textmode, so I have had no experience in using programs in RPN on the Prime. Sorry. I am assuming that you programmed RR.

[@rolinychupetin]

EXPORT RR(R1,R2) BEGIN RETURN(R1*R2/(R1+R2)); END;

[@drbarnack1885]

In RPN mode on the Prime you could run this in two ways: a) Put the two values on the stack and then enter RR(). So you would input 2 ENTER 7 ENTER RR() ENTER b) Put the function in algebraic single quotes and evaluate. So you would input 'RR(2,7)' ENTER Eval It seems to behave similarly to the HP-48.

[@Su-io5vw]

Thank you sir

[@rolinychupetin]

Welcome