I would like to fold a dataset with several columns into one single columns. So I would like to use the built-in function "Fold multiple columns".
The only annoying thing is that I would have 1739 columns to select. It is fairly time-consuming to do this by hand. Would there be any sort of trick to select all the columns, instead of typing each name? I can use a script in R or Python but I was wondering if there was a way to do it in a preparation script.
I tried to select the columns and use the "mass action" but the fold command cannot be found.