LODDSINV

loddsinv
Compute the inverse of log odds.

	  p = loddsinv(z,b)

	  The function is equal to 1/(1+exp(-u)) with 
              u = z if only one input argument is given
              u = z*b if size(z,2) = length(b)
	       u = z*b(1:n-1) + b(n) if size(z,2) < length(b)