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From: Oleg Komarov on 11 May 2010 11:02
"Artur Racu" <
> "Oleg Komarov"
> > "Artur Racu"
> > > hy everybody,
> > >
> > > how can help me, i hve a retangular matrix and belove the diagonal i have zeros how can i remove them without removing zeros above the diagonal,
> > >
> > > thank you,
> > > Artur
> >
> > I suppose you have, for example purposes:
> > rectM = rand(3,4)
> > rectM =
> > 0.35 0.55 0.76 0.57
> > 0.83 0.92 0.75 0.08
> > 0.59 0.29 0.38 0.05
> >
> > Then, creating the index for the elements under the diagonal:
> > IDXl = logical(tril(ones(size(rectM)),-1))
> > IDXl =
> > 0 0 0 0
> > 1 0 0 0
> > 1 1 0 0
> >
> > Finally I don't know what you mean by removing elements...I interpret it as NaNning them out:
> > rectM(IDXl) = NaN
> > rectM =
> > 0.35 0.55 0.76 0.57
> > NaN 0.92 0.75 0.08
> > NaN NaN 0.38 0.05
> >
> > Oleg
>
> thank you,
>
> i found a new solution, i made a loop for extracting the upper part of the matrix,
>
> thanks anyway,
>
> Artur
Be aware that looping on big matrices may result significantly slower than using triu or tril.

Oleg
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