Hi


On Wed, Jul 7, 2010 at 7:49 PM, jd6688 <jdsignature@gmail.com> wrote:

>
> Here are what i am going to accomplish:
>
> I have 400 files named as xxx.txt. the content of the file looks like the
> following:
>
>    name    count
>
> 1. aaa     100
> 2. bbb    2000
> 3. ccc    300
> 4. ddd   3000
>
> ........
> more that 1000 rows in each files.
>
> these are the areas i need help:
> 1. how can i only read in the files with the string patterns ggg or fff as
> part of the file names?
>  for instance, I only need the file names with the ggg or fff in it
>     xxxxx_ggg_yyyyy_1.txt
>     yyyy_fff_yyyy_xxx.txt
>
>    i don't need to read in the files, such as xxxx_aaa_yyyy.txt
>

Look at the function list.files() and grep().

list.fiels reads all filenames in a directory into R, with grep you can
search the file for the pattern "ggg" and "fff"

finally, use read.table to load them.


> 2.how cam rename the files:
>
>  for instance: xxxxx_ggg_yyyyy_1.txt======>changed to ggg1a.txt
>

? file.rename

There are several functions, starting with file. , to do file operations
operation system independent.

>
>
> 3.after the files read in, how can i only keep the rows with the aaa and
> bbb, everything elses show be removed from the files, but the files still
> remain the same file name?
>
>   for instance, in the xxxxx_ggg_yyyyy_1.txt file, it shouls looks like:
>  name    count
>
> 1. aaa    100
> 2. bbb    2000
> 3. aaa    300
> 4. bbb    400
>
>
again, check grep or subset.

Cheers,

Rainer

>
> Thanks so lot, I am very new to R, I am looking forward to any helps from
> you.
>
> --
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>
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