echo on
Mass = rand(1,10000);
Length = rand(1,10000);
Width = rand(1,10000);
Height = rand(1,10000);
echo off

tic;for I = 1:10000;
   Density(I) = Mass(I)/(Length(I)*Width(I)*Height(I));
end;toc

tic;Density = Mass./(Length.*Width.*Height);toc
