[R] subbing a string vector for another string vector

[Phil Spector]

One way to do it is with mapply:

> mydf = data.frame(image=c('http://$IMAGE_ID$','$IMAGE_ID$'),pattern=c('www.url.com/image.jpg','http://www.blah.com/image.gif'))
> mydf$url  = mapply(sub,"\\$IMAGE_ID\\$",mydf$pattern,mydf$image)
> mydf
               image                       pattern                           url
1 http://$IMAGE_ID$         www.url.com/image.jpg  http://www.url.com/image.jpg
2        $IMAGE_ID$ http://www.blah.com/image.gif http://www.blah.com/image.gif

 					- Phil Spector
 					 Statistical Computing Facility
 					 Department of Statistics
 					 UC Berkeley
 					 spector at stat.berkeley.edu




On Wed, 8 Sep 2010, jlemaitre wrote:

>
> I have a data frame with two columns:
>      image                               pattern
> 1    http://$IMAGE_ID$            www.url.com/image.jpg
> 2    $IMAGE_ID$                      http://www.blah.com/image.gif
> ...
>
> I want to replace "$IMAGE_ID$" with the corresponding entry in the pattern
> column such that the result would appear as follows:
>
> url
> http://www.url.com/image.jpg
> http://www.blah.com/image.gif
>
> Using something like  > gsub("\\$IMAGE\\_ID\\$",image,pattern) doesn't work
> because it only takes uses the first entry in "pattern" as the replacement
> for all "image" entries:
>
> url
> http://www.url.com/image.jpg
> www.url.com/image.jpg
>
> Please help.
> Thanks.
>
>
>
>
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