why can I not create 3 subplots?

Question

Matthias Pospiech 2012-2-21

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/29802-why-can-i-not-create-3-subplots

This code deletes the second subplot when the third is created:

clc
figure(1); clf;
sp(1) = subplot(1,3,1, 'Parent', hfig);
set(sp(1),'Position',[0.02 0.05 0.30 0.80]);
sp(2) = subplot(1,3,2, 'Parent', hfig);
set(sp(2),'Position',[0.32 0.15 0.60 0.80]);
sp(3) = subplot(1,3,3, 'Parent', hfig);
set(sp(3),'Position',[0.22 0.25 0.50 0.80]);

But why???

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Answer 1

Matt Tearle 2012-2-21

3
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https://ww2.mathworks.cn/matlabcentral/answers/29802-why-can-i-not-create-3-subplots#answer_38188

在 MATLAB Online 中打开

subplot deletes any axes that are already where you're trying to put the new one. If you're going to set the position property of the axes manually anyway, why bother with subplot at all? Just use axes:

clc, figure(1); clf;
sp(1) = axes('Parent', hfig);
set(sp(1),'Position',[0.02 0.05 0.30 0.80]);
sp(2) = axes('Parent', hfig);
set(sp(2),'Position',[0.32 0.15 0.60 0.80]);
sp(3) = axes('Parent', hfig);
set(sp(3),'Position',[0.22 0.25 0.50 0.80]);

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Matthias Pospiech 2012-2-21

I do not want overlapping axis, I just did it to show the effect. Actually I wanted to create 3 plots with equal width side by side. But once I create the third one the second is deleted.

Jiro Doke 2012-2-21

Oh I see. The actual axes bounds go beyond the position (since there needs to be space for the axes tick labels), so that's why "subplot" thinks they are overlapping even if you place them side by side.

So you're better off just using the axes function. If you think about it, the first 3 arguments of subplots are meant for axes placement. If you're going to change the placement position, then subplot probably isn't the right choice.

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