I am just testing the possibility of using grep under for loop:
>for(i in 1:10){grep("a",letters)}
nothing came out;
when I ran:
>grep("a",letters),
I got "1"
so in my for loop, I expected to see ten "1"s, but I did not.
Could anybody help me to figure out why? Thanks a lot for your help.
Capricy
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