Try this:

sapply(exclude, grep, x = dataset, value = TRUE)


On Tue, Nov 9, 2010 at 2:36 PM, Broeckling,Corey <
Corey.Broeckling@colostate.edu> wrote:

>  Hello R Helpers,
>
> Business - 64 bit windows 7, R 2.11.1
>
>
>
> I am trying to match the character contents of one list, called 'exclude',
> to those of a second list, called 'dataset'
>
> dataset is a list of file names with folder locations, and looks like this
> when called:
>
> > dataset
>  [1] "A/10-10-29a-13.cdf" "A/10-10-29a-14.cdf" "A/10-10-29a-15.cdf"
> "A/10-10-29a-16.cdf" "A/10-10-29a-17.cdf" .....(about 20
>
> file location/names in this case).....
>
> I also have the 'exclude' list, which looks like this when called:
>
> > exclude
>     Row.names
> 1 10-10-29a-13
> 2 10-10-29a-14
> 3 10-10-29a-17
> 4 10-10-29a-18
>
> or
>
> > exclude[,]
> [1] "10-10-29a-13" "10-10-29a-14" "10-10-29a-17" "10-10-29a-18"
>
> As you can see, the formats of the file names in the exclude list are
> different from those in the dataset list.  What I want to
>
> do is to match file names in the exclude list to those in the dataset list
> and remove them to create a subset_dataset, composed
>
> of all the dataset files minus the files in the exclude list.  Since the
> file names are different, it seems that i have to use
>
> a function such as agrep, and have gotten this to work if I feed in
> individual file names:
>
> > agrep("10-10-29a-13", dataset, value=TRUE, max.distance=0)
> [1] "B/10-10-29a-13.cdf"
>
> However, I don't want to do this manually for each file on the exclude list
> - I want to do so for each character string on the
>
> exclude list.  I am not aware of any list options in agrep specifically,
> and while pmatch takes a list of a match option, it
>
> will not successfully match the partial string:
>
> > pmatch(exclude[,], dataset)
> [1] NA NA NA NA
>
> I am still in the process of teaching myself R, so maybe there is something
> I am missing.  I also tried to figure out how to
>
> use the recursive apply functionality, but haven't been able to get that to
> work.  Any suggestions?
>
> Corey
>
> ______________________________________________
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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