[R] unable to update the matrix values within a function

From: Ken Liu <tyliu0522_at_yahoo.com>
Date: Fri, 20 Jun 2008 16:41:43 -0700 (PDT)


I don't understand why this doesn't work:

matTest <- matrix(nrow=3, ncol=3)
testMove <- function(I, J){

    for(i in 1:I){

        for(j in 1:J){
            matTest[i, j] <- i+j

testMove(2, 3)

Why the elements of the matrix matTest are still NA? How could I fix it?


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