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

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Robin Chapman

Posts: 38
Registered: 10/29/12
Re: Nx2N lapped orthogonal transform
Posted: Aug 20, 2013 3:45 AM
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On 19/08/2013 19:04, Nicolas Bonneel wrote:
> 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?


No




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