[R] How to remove double for loop?

From: Jonas Malmros <jonas.malmros_at_gmail.com>
Date: Wed, 19 Mar 2008 12:24:24 +0100


Hello everyone.

I use double for loops to fill in matrices, but there are surely better (and computationally faster) ways to perform that task. Could someone show me, given the following example of a double for loop, how this could be done? It is much easier to learn by examples.

Val <- matrix(0, nrow=n+1, ncol=n+1)
for( i in 0:n){

    for(j in 0:i){

        Val[j+1, i+1] <- u^j*d^(i-j)
    }
}

Thank you in advance!

-- 
Jonas Malmros

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