Re: Please, help me vectorize this code

[Siki Zoltan]

Dear Pablo,

instead of the loop write simply:

M_(r,c) = M(r,c);

Regards,
Zoltan

On Sun, 17 Sep 2017, Pablo Fernández Bustamante wrote:

> Hi,
>
> I want the elements of a matrix M_ to be equal to those of an original matrix 
> M but only if they satisfy a certain condition, otherwise write a zero.
>
> The following lines of code work as expected but I want to avoid the
> loop if it is possible.
>
> > > M = floor(rand(5, 4)*10);
> > > [r, c] = find(M > 4);
> > > M_ = zeros(5, 4);
> > > for n = 1:length(r)
> M_(r(n), c(n)) = M(r(n), c(n));
> endfor
>
> I have tried
>
> M_ = M(find(M>4));
>
> but that returns a column vector of the elements which satisfy the condition.
>
> Thanks in advance,
>
> Pablo
>
>
>
>
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