[R] use object within rda file in for loop

[Ivan Calandra]

Hi Henrik,

Thank you for this suggestion, it does sound easier indeed!

Ivan

Le 5/20/2010 15:50, Henrik Bengtsson a écrit :
> On Thu, May 20, 2010 at 3:06 PM, Ivan Calandra
> <ivan.calandra at uni-hamburg.de>  wrote:
>    
>> I've found the answer:
>> get() is exactly what I need, I completely forgot about this function.
>>
>> There might be a better way, but that works for me.
>>      
> I R.utils, there are saveObject() and loadObject(), which allows you
> to save and load objects without having to worry about their names.
> For example:
>
> library("R.utils");
> x<- list(a=2, b=3:40, fcn=rnorm);
> saveObject(x, "objs.Rbin");
>
> Then later you can load the list object that 'x' held as whatever you
> want, say, 'y', e.g.
>
> library("R.utils");
> y<- loadObject("objs.Rbin");
>
> This way you don't "contaminate" the working environment with
> variables named according to the file, which sometimes can be a
> surprise (since you don't always know what the file contain).  Except
> from that it works just like save()/load().
>
> /Henrik
>
>    
>> Ivan
>>
>> Le 5/20/2010 14:13, Ivan Calandra a écrit :
>>      
>>> Dear users,
>>>
>>> I would like to process all the lists from all *.rda files that I have in
>>> one folder.
>>> Up to now, I can load all the *.rda files without any problem.
>>>
>>> The problem is when I want to access the list saved within each *.rda file
>>> (only one list per rda file).
>>>
>>> Here is my code:
>>> fpath<- "D:/R"
>>> listnames<- list.files(path=fpath, pattern=glob2rx("*.rda"),
>>> full.names=FALSE)
>>> for (i in 1:length(listnames)) {
>>>   load(paste(fpath, listnames[i], sep="/"))
>>>   z<- list_in_listnames[i]  ## here is my problem
>>>   **do something on z**
>>> }
>>>
>>> It might be really simple, but listnames is a character vector and I
>>> cannot find how to store the values within each element into z.
>>> I think there would be a function to get and use an object with a given
>>> pattern in its name. The pattern itself is no problem, the problem is the
>>> function.
>>> I've tried to look on RSiteSearch but, probably because I couldn't figure
>>> out the keywords, haven't found anything helpful.
>>> Maybe I'm just on the wrong path to do it or missed something obvious...
>>>
>>> I hope my question is clear. If not, please let me know what would help
>>> you to understand.
>>>
>>> Thanks in advance
>>> Ivan
>>>
>>>        
>> --
>> Ivan CALANDRA
>> PhD Student
>> University of Hamburg
>> Biozentrum Grindel und Zoologisches Museum
>> Abt. Säugetiere
>> Martin-Luther-King-Platz 3
>> D-20146 Hamburg, GERMANY
>> +49(0)40 42838 6231
>> ivan.calandra at uni-hamburg.de
>>
>> **********
>> http://www.for771.uni-bonn.de
>> http://webapp5.rrz.uni-hamburg.de/mammals/eng/mitarbeiter.php
>>
>> ______________________________________________
>> R-help at 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.
>>
>>      
>    

-- 
Ivan CALANDRA
PhD Student
University of Hamburg
Biozentrum Grindel und Zoologisches Museum
Abt. Säugetiere
Martin-Luther-King-Platz 3
D-20146 Hamburg, GERMANY
+49(0)40 42838 6231
ivan.calandra at uni-hamburg.de

**********
http://www.for771.uni-bonn.de
http://webapp5.rrz.uni-hamburg.de/mammals/eng/mitarbeiter.php