control checkerboard pattern size on printed paper

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Brian 2017-12-5

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https://ww2.mathworks.cn/matlabcentral/answers/371296-control-checkerboard-pattern-size-on-printed-paper

编辑： Brian 2017-12-5

I would like to print the following checkerboard to a pdf file such that it has the correct given dimension on the A4 sheet. The example is a 6 times 6 tile pattern where each tile is 20 pixels times 20 pixels. I would like that the pattern is exactly 12 cm times 12 cm when printed on a4 paper. I have tried fig.PaperPosition and ax.Position but, as you can see from my example I did not succeed.

Im = checkerboard(20,3,3);
h = figure;
imshow(Im)
hold on
plot([10,100,100,10,10],[10,10,100,100,10],'r*-')
fig = gcf;
fig.PaperType = 'a4';
fig.PaperUnits = 'centimeters';
fig.PaperOrientation ='landscape';
fig.PaperPosition = [1 1 12 12]; 
print('-dpdf','tester.pdf','-r1080')