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Position-based substitution in arrays (See related posts)

// Replace array values based on their row and column position
// This is an alternative to using for loops to test each position

a <- array(0, dim=c(10, 10))
a[row(a) <= col(a)*2] <- 1
to array r substitute by mroutley on Fri Apr 21 19:59:43 -0400 2006

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