[R] problem with grep under loop

[David Winsemius]

Wrap a print or cat function around it.



Sent from my iPhone

On Sep 13, 2013, at 6:29 PM, capricy gao <capricyg at yahoo.com> wrote:

> 
> 
> 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
>    [[alternative HTML version deleted]]
> 
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