用于电力系统的一个很好的分析软件

				function [x,y,s] = mask(a,idx,orient,vals)								x = cell(4,1);				y = cell(4,1);				s = cell(4,1);								[xp,yp] = fm_draw('P','Pmu',orient);				[xu,yu] = fm_draw('U','Pmu',orient);				[xm,ym] = fm_draw('M','Pmu',orient);								x{1} = [-1 0  4 5  4 0 -1];				y{1} = [0 1 1 0 -1 -1 0];				s{1} = 'k';								x{2} = xp+0.5;				y{2} = yp;				s{2} = 'y';								x{3} = xu+3;				y{3} = yu;				s{3} = 'y';								x{4} = xm+2;				y{4} = ym;				s{4} = 'y';