[R] Using a Data Frame/Matrix outside a function
Greg Gilbert
gregory.e.gilbert at gmail.com
Thu Apr 1 18:16:14 CEST 2010
I have code that creates the same matrices , "a" and "b". The code creating
"a" is not in a function and the code creating "b" is in a function. I would
like to do operations on "b" like I can on "a", however I can't figure out
how I can return a matrix (or data frame) from a function. Thanks for your
help!
> r <- 5; c <- 5
> a <- matrix(NA,nrow=5, ncol=5)
> for(i in 1:r) {
+ for (j in 1:c) {
+ if(i==j) a[i, j] <- i
+ }
+ }
>
> diag(a)
[1] 1 2 3 4 5
>
> data.out <- function(r, c) {
+ b <- matrix(NA,nrow=r, ncol=c)
+ for(i in 1:r) {
+ for (j in 1:c) {
+ if(i==j) b[i, j] <- i
+ }
+ }
+ }
>
> data.out(5, 5)
> diag(b)
Error in diag(b) : object 'b' not found
>
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