Performance test

[DaNiMoTh]

Hello to all.

I've tried to execute the same routine (see attachment) with matlab,
octave and a C program.

There are the results ( both of programs under Linux )

MatLab:
>> tic ; kernel(magic(100)) ; toc
Elapsed time is 0.052000 seconds.

Octave:
octave:1> tic ; kernel(magic(100)) ; toc
Elapsed time is 56.9406 seconds.

C:
time ./a.out
real    0m0.075s

Why this difference?
Where is the bottleneck of Octave? There is some documentation about this?

Many Thanks. ( Please CC'd me in reply as I'm not a follower of this list )

kernel.m :

function G = kernel(A)

colonne_m = size(A)(2);
righe_n = size(A)(1);

G = zeros(righe_n,righe_n);

for i = 1:righe_n
       for j = 1:colonne_m
               for k = 1:colonne_m
                       G(i,j) = G(i,j)+(A(i,k)*A(j,k));
               endfor
               G(i,j) = (G(i,j)+1)^3;
       endfor
endfor

matrix_kernel.c
Description: Binary data