I'm having an issue with grep:
I have numerous columns that end with .at... when I use grep like so:
df[,grep(".at",colnames(df))]
it works fine. When I have one column that ends with .at, it does not
work. Why is that? As this is loop with varying number of columns
ending in .at I would like some code that would work with 1 to n
number of columns.
Is there something more optimal than grep?
Thanks!
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