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Plot of square region of points

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nick
nick 2017-3-14
编辑： nick 2017-3-14
Hi, how can I plot a square lattice of points in a central region of my axes ?
if true
x1=0;
x2=1;
y1=0;
y2=1;
x = [x1, x2, x2, x1, x1];
y = [y1, y1, y2, y2, y1];
plot(x, y, 'b-', 'LineWidth', 3);
hold on;
x1=150;
x2=350;
y1=150;
y2=350;
x = [x1, x2, x2, x1, x1];
y = [y1, y1, y2, y2, y1];
% plot(x, y, 'b-');
xlim([1, 512]);
ylim([-1, 512]);
end
I mean, to plot points in the rectangular region that is possible to have with this code

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