description: g=uminus(f) is called for the syntax '-f' and means symbolic negation. arguments: NCpoly representing the polynomial f or matrix of NCpolys output: NCpoly representing the polynomial -f possible usage: -f, uminus(f) example: >> f=[x^2-2*x*y, (x-y)^2]; >> -f ans = -x^2+2*x*y -x^2+x*y+y*x-y^2 |