L=dwiltlength(Ls,M);
dwiltlength(Ls,M) returns the length of a Wilson / WMDCT system with M channels system is long enough to expand a signal of length Ls. Please see the help on dwilt or wmdct for an explanation of the parameter M.
If the returned length is longer than the signal length, the signal will be zero-padded by dwilt or wmdct.
A valid transform length must be divisable by 2M. This means that the minumal admissable transform length is
Lsmallest = 2*M;
and all valid transform lengths are multipla of Lsmallest