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Topic: very specific symmetric matrix
Replies: 5   Last Post: Jun 16, 2014 3:31 AM

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Bruno Luong

Posts: 9,042
Registered: 7/26/08
Re: very specific symmetric matrix
Posted: Jun 16, 2014 3:31 AM
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"Eric" wrote in message <lnlr9p$f3u$1@newscl01ah.mathworks.com>...
> "Bruno Luong" <b.luong@fogale.findmycountry> wrote in message <lne84h$19k$1@newscl01ah.mathworks.com>...
> >
> > > Thanks; Is there some version of blkdiag or something else which allows you to put blocks on the off-diagonals, instead of only main diagonal?
> >
> > spdiags(), it will creates sparse matrix, but can easity converted to regular matrix using full()
> >
> > Bruno

> I don't see how that answers my question; I'm talking about taking blocks and placing them on diagonals; while there is a command to place them on the main diag (blkdiag), there doesn't seem to be a straightforward way to play blocks on the off-diagonals.

If your blocks is constant in size, might be you can you kron() combined with spdiags() to accomplish building matrix with the blocks off-diagonals


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