电力系统分析计算程序

				function [x,y,s] = mask(a,idx,orient,vals)								[xo,yo] = fm_draw('O','Oxl',orient);								x = cell(5,1);				y = cell(5,1);				s = cell(5,1);								x{1} = [-1.8 4.1 4.1 -1.8 -1.8];				y{1} = [-1.5 -1.5 1.5 1.5 -1.5];				s{1} = 'k';								x{2} = 1.8+[-1.3 0];				y{2} = [1 -1];				s{2} = 'r';								x{3} = 1.8+[-1.3 0];				y{3} = [-1 1];				s{3} = 'r';								x{4} = 1.5*xo-1.2;				y{4} = 2*yo;				s{4} = 'r';								x{5} = [2.3 2.3 3.6];				y{5} = [1 -1 -1];				s{5} = 'r';