On Fri, 17 Feb 2006, Mathieu Bouchard wrote:
If they are not circulant, then I guess you can fake it by considering them each as the sum of a circulant matrix and a simpler matrix. The latter is actually a triangular Toeplitz minus its transpose.
lies, lies, damn lies. It looks like: [ 0, +a, +b, +c -c, 0, +a, +b -b, -c, 0, +a -a, -b, -c, 0 ]
So it's not really what i said it is, but still it's a subgroup of Toeplitz.
because a circulant matrix is like a cyclic convolution product,
damn. let's rephrase this as: the ordinary matrix product on circulant matrices is like a cyclic convolution product.
_ _ __ ___ _____ ________ _____________ _____________________ ... | Mathieu Bouchard - tél:+1.514.383.3801 - http://artengine.ca/matju | Freelance Digital Arts Engineer, Montréal QC Canada