电力系统分析计算程序

				function [x,y,s] = mask(a,idx,orient,vals)								x = cell(2,1);				y = cell(2,1);				s = cell(2,1);								x{1} = [-1 -1 1 1 -1];				y{1} = [-1 1 1 -1 -1];				s{1} = 'k';								x{2} = [-0.35 -0.35 0 0.35 0.35];				y{2} = [-0.35 0.35 0.05 0.35 -0.35];				s{2} = 'b';