[R] Assignment to a list in a function
Peter Dalgaard BSA
p.dalgaard at biostat.ku.dk
Wed Nov 28 18:46:49 CET 2001
"Heywood, Giles" <giles.heywood at CommerzbankIB.com> writes:
> Assignment to a list in a function does not behave as I would expect.
>
> The following function illustrates the point
>
> #----------------------------------------
> temp _ function()
> {
> nf _ 2
> ns _ 5
> z _ vector("list",ns)
> x _ matrix(NA,nrow=ns,ncol=nf)
> for(j in 1:ns)
> {
> for(i in 1:nf)
> {
> x[,i] _ i+j*100
> }
>
> z[[j]] _ x
>
> print(z[[j]])
> }
> z
> }
> #------------------------------------------
>
> Replacing the line that assigns z[[j]] with the following 2 lines produces
> the expected result
>
> y _ x
> z[[j]] _ y
>
> Furthermore, I get the expected result by running the function under Splus
> 6.
Um, you're not telling us what you're expecting, nor what you're
getting, nor what is supposedly wrong, nor which version of R this
relates to, nor the operating system....
Running your code (after removing the tab and underscore damage) I get
exactly the same result with or without the intermediate assignment.
--
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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