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In the interests of efficient coding, rewrite the nested loop example below, where the matrix foo was filled with the multiples of the elements of
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In the interests of efficient coding, rewrite the nested loop example below, where the matrix foo was filled with the multiples of the elements of loopvec1 and loopvec2, using only a single for loop.
R> foo <- matrix(NA,length(loopvec1),length(loopvec2)) R> foo
In the interests of efficient coding, rewrite the nested loop example below, where the matrix foo was filled with the multiples of the elements of loopvec1 and loopvec2, using only a single for loop.
[,1] [,2] [,3] [,4] [1,] NA NA NA NA [2,] NA NA NA NA [3,] NA NA NA NA R> for(i in 1:length(loopvec1)){ + for(jin1:i){ + foo[i,j] <- loopvec1[i]+loopvec2[j] +} +} R> foo
[,1] [,2] [,3] [,4] [1,] 14 NA NA NA
[2,] 15 14 NA NA [3,] 16 15 14 NA
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