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Topic: Nx2N lapped orthogonal transform
Replies: 13   Last Post: Sep 12, 2013 7:38 PM

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Nicolas Bonneel

Posts: 6
Registered: 4/23/13
Re: Nx2N lapped orthogonal transform
Posted: Aug 19, 2013 2:04 PM
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On 8/19/2013 12:34 AM, James Dow Allen wrote:
> Let
> ( A B 0 )
> ( 0 A B )
> ( B 0 A )
> be a 3Nx3N real matrix with A,B,0 each NxN and 0 an all-zeros matrix.
> What is the necessary and sufficient condition for that matrix to be
> orthogonal, i.e. that its transpose also be its inverse?

by direct computation, AB=BA=0 and A^2+B^2=Id, right?

Nicolas Bonneel

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