## bbhadamard

This function is not yet fully documented. This is a transcript of
the text-formatted help.

bbhadamard Create a black-box operator for a Hadamard matrix.
BB=bbhadamard(N) creates an N-by-N Hadamard matrix. A Hadamard matrix
is a unitary matrix where all elements are 1 or -1.
For N>2 it is necessary that rem(N,4)=0 for a Hadamard matrix to exist.
It is conjectured that this is also sufficient. bbhadamard requires that
N can be factorized as a product of 2, 12, 20, 28, 36, and 44.
An operator near the requested size can be retrieved as follows:
[BB,N2]=bbhadamard(N,'next') Ensure N2>=N
[BB,N2]=bbhadamard(N,'prev') Ensure N2<=N
N2 is the order of the generated operator.
See also .

bbfuncmbbhankel