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
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