数据= importdata (“data.txt”);
X = data(:，1);
Y = data(:，2);
N = 500;
xi = linspace(min(x)，max(x)，N);
yi = linspace(min(y)，max(y)，N);
[X,Y] = meshgrid(xi,yi);
idx = inpolygon(X,Y, X,Y);
Z = ones(size(X));
Z(idx) = 0;
imshow (Z)
