59
votes
10
answers
642
views
Grouping functions (tapply, by, aggregate) and the *apply family
Whenever I want to do something "map"py in R, I usually try to use a function in the apply family. However,
59
votes
7
answers
2.9K
views
pandas create new column based on values from other columns / apply a function of multiple columns, row-wise
I want to apply my custom function (it uses an if-else ladder) to these six columns (ERI_Hispanic, ERI_AmerInd
63
votes
15
answers
1.4K
views
When should I use CROSS APPLY over INNER JOIN?
What is the main purpose of using CROSS APPLY? I have read (vaguely, through posts on the Internet) that cros
