?get
?rowSums
?rowsum
a "group" is not a defined data structure in R, btw. You have a much
better chance of getting precise answers if you ask precise questions.
See the Posting Guide.
-- Bert
On Sun, Apr 8, 2012 at 9:01 PM, Frank Tamborello <frank.ta...@gmail.com> wrote:
> Dear R Help,
>
> I am attempting to write a function that takes a list of variable groups and
> a vector of numbers (e.g., "jtsv" would indicate one group of variables,
> "jtsv1", "jtsv2", etc, each of which name a variable in a data frame), and
> returns a list of variable group sums. For example, given list("jtsv",
> "ptsv") and c(1:10), where jtsv1, etc, are all numeric vectors of the same
> length, the function should return a list of jtsv and ptsv, where
> jtsv <- jtsv1 + jtsv2 + jtsv3 + jtsv4 + jtsv5 + jtsv6 + jtsv7 + jtsv8 + jtsv9
> + jtsv10
> ptsv <- ptsv1 + ptsv2 + ptsv3 + ptsv4 + ptsv5 + ptsv6 + ptsv7 + ptsv8 + ptsv9
> + ptsv10
>
> So far I've used a for loop to paste together the names of the variables as
> character vectors, so that I can at least name the variables that I want to
> get, but I'm stuck on how to add together the numeric vectors that those
> character vectors are ultimately supposed to name. It seems like I should be
> able to map the primitive "+" operator onto a list or vector that contains
> the variable names. If that's a good way to go, what would that look like? Or
> if that's not a good way to go, would someone please point me in a good
> direction?
>
> Sincerely,
> Frank Tamborello
>
>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
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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.
--
Bert Gunter
Genentech Nonclinical Biostatistics
Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm
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