[R] spliting strings ...

[seanpor]

Good afternoon Monica,

Relying on regular expressions, substituting nothing "" for everything
starting with a space until the end of the "line" (i.e. with a dollar sign) 

str1 <- sub(" .*$", "", str)

Regards,
Sean


Monica Pisica wrote:
> 
> 
> Hi everyone,
>  
> I have a vector of strings, each string made up by different number of
> words. I want to get a new vector which has only the first word of each
> string in the first vector. I came up with this:
>  
> str <- c('aaa bbb', 'cc', 'd eee aa', 'mmm o n')
> str1 <- rep(1, length(str))
> for (i in 1:length(str)) {
>      str1[i] <- strsplit(str, " ")[[i]][1]
> }
>  str1
> 'aaa'   'cc'   'd'  'mmm'
>  
> Now, is there any way to do this simpler?
>  
> Thanks,
>  
> Monica
>  
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