[R] how to define a function in R

[Stephan Kolassa]

Hi,

I recommend that you look at the following help pages and experiment a 
little (maybe create a toy directory with only three or four files with 
a few lines each):

?files
?dir
?grep
?strsplit

Good luck!
Stephan


jd6688 schrieb:
> 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
> 
> 2.how cam rename the files:
> 
>   for instance: xxxxx_ggg_yyyyy_1.txt======>changed to ggg1a.txt
> 
> 
> 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
> 
> 
> Thanks so lot, I am very new to R, I am looking forward to any helps from
> you.
> 
> 
> On Tue, Jul 6, 2010 at 7:19 PM, Nordlund, Dan (DSHS/RDA) [via R] <
> ml-node+2280308-38709657-312346 at n4.nabble.com<ml-node%2B2280308-38709657-312346 at n4.nabble.com>
>> wrote:
> 
>>  > -----Original Message-----
>>> From: [hidden email]<http://user/SendEmail.jtp?type=node&node=2280308&i=0>[mailto:
>> r-help-bounces at r-
>>> project.org] On Behalf Of jd6688
>>> Sent: Tuesday, July 06, 2010 3:49 PM
>>> To: [hidden email]<http://user/SendEmail.jtp?type=node&node=2280308&i=1>
>>> Subject: [R] how to define a function in R
>>>
>>>
>>> 1. how to write a R script?
>>> 2.How to write a SAS like macro/generic process to process multiple
>>> files by
>>> using the same funstion in R?
>>>
>>> Thanks in advance
>> Don't thank me too soon. :-)  Your question is equivalent to me going to
>> SAS-L and asking someone to teach me SAS macro language.  You need to
>> provide more information about what your task actually is.  Where are these
>> file names that you want to process coming from?  What do you want to do
>> with them?
>>
>> The basic approach would be to put the file names in a list and then pass
>> the list items one at a time to your function.  But how to do that really
>> depends on what you are trying to do.  You might also read the posting guide
>> listed at the bottom of every posting.
>>
>> Dan
>>
>> Daniel J. Nordlund
>> Washington State Department of Social and Health Services
>> Planning, Performance, and Accountability
>> Research and Data Analysis Division
>> Olympia, WA 98504-5204
>>
>>
>> ______________________________________________
>> [hidden email] <http://user/SendEmail.jtp?type=node&node=2280308&i=2>mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html>
>> and provide commented, minimal, self-contained, reproducible code.
>>
>>
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>>
>