very very very slow computing

[Depo]

> I guess your problem is missing semicolon in line
>    new_sign_difference(k,i)=sign_difference(k,i)
> which means that whole matrix is printed in every cycle . After I
> removed output to screen by adding semicolon and removing both disp()
> commands, the assignment takes about 2.5 secs on my computer (for
> 10*3000 matrix).

That was the problem!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Even in my computer
works
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