Alternative to for loops in R with purrr's map, map_dbl, and map_dfr functions (CC043)

[@joseluisloren904]

I discovered this channel looking for answers related to R and RStudio questions I had. I want to thank you for the videos. Great explanations, direct and clear. Thanks!

[@Riffomonas]

Wonderful - thanks!

[@connoross13]

Thanks for the video! Very informative - I'm definitely going to be coming back for more videos. Quick question @15:13 - "I'm only interested in sampling the same number of genomes 100 times... *so threshold = 3*" Why is the threshold 3 here? Is it because we're only sampling 3 genomes?

[@Riffomonas]

Thanks for watching! It's been a while since I did this, but looking back at the code quickly, I think I was drawing 3 genomes from each species 100 times

[@connoross13]

@@Riffomonas Thanks for the clarification! You're a true gentleman for replying.

[@bassamabdelnabi3117]

Great thanks so much. Keep up the good work

[@Riffomonas]

Thanks! 🤓

[@avp300]

Great video and explanation!

[@Riffomonas]

Hi Ankit - Glad you liked it! Thanks for watching and please be sure to spread the word :)

[@javierhernando5063]

Great video! What if some of the columns can't be coerced to numeric value? Let say I am performing iterative analysis through a large database in which several variables can't be calculated, but however, I am more interested in running the whole database than picking one by one the variables

[@Riffomonas]

If your function needs numeric values, then I'd suggest only running the map functions on those columns that are numeric. Alternatively, you could use pivot_longer to put those columns into a single column, then using nest and map with mutate. I have another episode that shows how to do this here: kzbin.info/www/bejne/opnWpWSlmJ6ggbM

[@mikedavis979]

Why does your voice sound funny in this episode? I'm guessing microphone or video processing, or something like that. Or did you have a cold? Ha ha. Anyway, I LOVE your content!!! You have so many videos, surely you can't look through all the comments on all of your videos. That would be a FT job (at least it seems that way). Anyhoo. I took both your online (zoom) MinimalR and mothur workshops, and they have helped so much, as well as your Code Club videos. Thanks again, Pat! Edit on comment: seems like your voice sounded different more in the first 5 minutes of the video. Or maybe I have recently ingested too much EtOH, as an ingredient in double IPAs. Ha! Anyway, your videos are so helpful, they are a positive contribution to reproducible science, insights into Microbiology, Microbiomes, and statistical analyses in general. Also a boon to using R for significant biological research. I better quit before the lauding seems more like exaggerated adulation.

[@doming258]

Hi can you do a episode to compare two graphs for the purpose of validation?

[@Riffomonas]

Hmmm maybe but I’m not sure what you mean. Do you have an example?

[@doming258]

@@Riffomonas if I have two similar graphs done by two independent programmers, how do I compare them programmatically to see if there are differences? For example, two scatter plots

[@russtin1]

Happy birthday

[@Riffomonas]

HAH! Thanks 😊

[@terraflops]

with so many YT channels asking me to "SMASH THE LIKE BUTTON" it has removed my ability to do so on this video.

[@Riffomonas]

HA! Well, just be sure to keep coming back for more :)

[@haraldurkarlsson1147]

Pat, This might sound like an out of place comment but have you heard of something called a "super assignment operator" designed by

[@Riffomonas]

Yeah it allows you to modify a variable so that it remains changed outside of a function even if you don’t return that variable. This is generally seen as a very bad idea

[@haraldurkarlsson1147]

Aha! Basically defining a local variable as global. I know this is considered bad form in python (probably all languages) in general.