function L = MakeLine(P,del_x,del_y) % P is a point. % del_x and del_y are real numbers. % L is the line through L.P with slope L.del_y/L.del_x. % (Note that if del_x = 0 then L is vertical.) L = struct('P',P,'del_x',del_x,'del_y',del_y);