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2008 Apr 30
8
Why R is 200 times slower than Matlab ?
I am switching from Matlab to R, but I found that R is 200 times slower than matlab. Since I am newbie to R, I must be missing some important programming tips. Please help me out on this. Here is the function: ## make the full pair-wise permutation of a vector ## input_fc=c(1,2,3); ## output_fc=( 1 1 1 2 2 2 3 3 3 1 2 3 1 2 3 1 2 3 ); grw_permute = function(input_fc){ fc_vector = input_fc index = 1 k = length(fc_vector) fc_matrix = matrix(0,2,k^2) for(i in 1:k){ for(j in 1:k){ fc_matrix[index] = fc_vector[i] fc_matrix[index+1] = fc_vector[j] index = index+2 } } return(fc_...
2008 Apr 30
0
Fwd: Why R is 200 times slower than Matlab ?
...R is 200 times > slower than > matlab. > > Since I am newbie to R, I must be missing some important programming > tips. > > Please help me out on this. > > Here is the function: > ## make the full pair-wise permutation of a vector > ## input_fc=c(1,2,3); > ## output_fc=( > 1 1 1 2 2 2 3 3 3 > 1 2 3 1 2 3 1 2 3 > ); > > grw_permute = function(input_fc){ > > fc_vector = input_fc > > index = 1 > > k = length(fc_vector) > > fc_matrix = matrix(0,2,k^2) > > for(i in 1:k){ > > for(j in 1:k){ > > fc_matrix[index]...