very nice expansion using struct!
And again, Alfonso beats us all. Well done.
Ha... Obi-wan, become matlab you must... :)
I often wish 'expand' was part of matlab base, don't you? (http://blogs.mathworks.com/pick/2012/03/02/when-deal-doesnt-work-disperse-2/)
I agree. Actually, at first glance I thought it was.
System of equations
Is this matrix orthogonal?
Replace Vector Elements
Fill a zeros matrix
Raise Matrix to Power
Count up then down
Create an 'arrow-head" matrix
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