Maxima Function
coefmatrix ([eqn_1, ..., eqn_m], [x_1, ..., x_n])
Returns the coefficient matrix for the variables x_1, ..., x_n of the system of linear equations eqn_1, ..., eqn_m.
(%i1) coefmatrix([2*x-(a-1)*y+5*b = 0, b*y+a*x = 3], [x,y]); [ 2 1 - a ] (%o1) [ ] [ a b ]