the short answer is to add [[i]] in your loop,
file_list[[i]] <- paste(index$month[i], index$year[i], sep='')
yet a shorter answer would be,
file_list = apply(index, 1, paste, collapse="")
HTH,
baptiste
2009/8/20 Steve Murray <smurray...@hotmail.com>:
>
> Dear R Users,
>
> I have 120 objects stored in R's memory and I want to pass the names of these
> many objects to be held as just one single object. The naming convention is
> month, year in sequence for all months between January 1986 to December 1995
> (e.g. Jan86, Feb86, Mar86... through to Dec95). I hope to pass all these
> names (and their data I guess) to an object called file_list, however, I'm
> experiencing some problems whereby only the first (and possibly last) names
> seem to make the list, with the remainder recorded as 'NA' values.
>
> Here is my code as it stands:
>
> index <- expand.grid(month=month.abb, year=seq(from=86,to=95, by=1))
>
> for (i in seq(nrow(index))) {
> file_list <- paste(index$month[i], index$year[i], sep='')
> print(file_list[i])
> }
>
> Output is as follows:
>
> [1] "Jan86"
> [1] NA
> [1] NA
> [1] NA
> #[continues to row 120 as NA]
>
>> file_list; file_list[i]
> [1] "Dec95"
> [1] NA
>
>> head(index) # this seems to be working fine
> month year
> 1 Jan 86
> 2 Feb 86
> 3 Mar 86
> 4 Apr 86
> 5 May 86
> 6 Jun 86
>
>
> Any help on how I can populate file_list correctly with all 120 combinations
> of month + year (without NAs!) would be gratefully received.
>
> Thanks,
>
> Steve
>
>
>
> _________________________________________________________________
>
> icons.
>
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
--
_____________________________
Baptiste Auguié
School of Physics
University of Exeter
Stocker Road,
Exeter, Devon,
EX4 4QL, UK
http://newton.ex.ac.uk/research/emag
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