MATLAB: Fast Element-Wise power

Question

Hello all,

I am trying to optimize some code that contains element wise calculations with rather large matrices. I have already shaved off about 50% with things like the bsxfun (which in my case works wonders). But now I am stuck at an operation where a simple line of code value=matrix.^3 takes up most of the runtime of the script. is there any way to perform this element-wise calculation faster?

Best regards

Answer 1

   a=1:10000000;
  b=repmat(3,size(a));
  tic
  c1=a.^b;
  toc
  tic
  c2=a.^3;
  toc
  tic
  c3=a.*a.*a;
  toc

And then the results are,

 Elapsed time is 0.118509 seconds.
 Elapsed time is 0.129281 seconds.
 Elapsed time is 0.006726 seconds.