[xvals, yvals, color] = hintmat(w)
[xvals, yvals, color] = hintmat(w)takes a matrix
w and
returns coordinates xvals, yvals for the patches comrising the
Hinton diagram, together with a vector color labelling the color
(black or white) of the corresponding elements according to their
sign.
hintonCopyright (c) Ian T Nabney (1996-9)