Re: building dynamic ranges from matrix

[Juan Pablo Carbajal]

On Wed, Nov 22, 2017 at 10:48 AM, Juan Pablo Carbajal
<address@hidden> wrote:
> Hi,
>
> If you want to save memory (wouldn't be my main concern, though) you
> cannot vectorize this easily because the result of each row doesn't
> have the same size. So arrayfun or cellfun might be your only option
> (I feel there might be a solution using accumarray, haven't give a
> thought to it, though).
>
> If you do not care wasting memory for values that will be discarted,
> then do the following (this is reasonable if you know that the gap
> between the intervals is not huge)
>
> M is your Nx2 matrix
>
> x = min (M(:)):max (M(:));
> tf = x >= M(:,1) & x <= M(:,2);
> tf = or (tf(1,:),tf(2,:));
> x(tf)

Error: here should be
tf = or (mat2cell (tf,ones(N,1),size(tf,2)){:})

Also notice that this makes the union of all the intervals, so it
doesn't repeat indexes. It might not be what you are looking for, but
maybe you ca improve from here.