description: h=plus(f, g) is called for the syntax 'f + g' and means symbolic addition. arguments: f and g are NCpolys representing polynomials or matrix of NCpolys with matching dimensions output: NCpoly representing the polynomial f + g possible usage: f + g, plus(f, g) example: >> f=[x^2-2*x*y,1-x];g=[x*y,x]; >> f+g ans = x^2-x*y 1 |