R help - Nov 2010 - agrep pmatch recursive???

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

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
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


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

	[[alternative HTML version deleted]]