Why is one of my subplots being deleted?

Question

L'O.G. 2022-2-25

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https://ww2.mathworks.cn/matlabcentral/answers/1658580-why-is-one-of-my-subplots-being-deleted

编辑： Matt J 2022-2-25

The second subplot is deleted after setting the first, but why? The bottom of the first subplot is at 0.3, whereas the top of the second subplot is at 0.19. There shouldn't be any overlap that would result in deletion.

figure;
ax1 = subplot(2,1,1,'Position', [0.05, 0.3, 0.92, 0.64]);
ax2 = subplot(2,1,2,'Position', [0.05, 0.09, 0.92, 0.1]);

Also, I get the following warning:

Warning: subplot ignores grid location arguments when Position is specified. This syntax will no longer be supported in a future release. 

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Answer 1

Les Beckham 2022-2-25

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编辑：Les Beckham 2022-2-25

在 MATLAB Online 中打开

If you know the position of the two axes already, you don't need to use the subplot function to position them for you.

Just do this:

figure
ax(1) = axes('position', [0.05, 0.3, 0.92, 0.64]);
ax(2) = axes('position', [0.05, 0.09, 0.92, 0.1]);

Note that I created ax as an array of axis handles.

Now you can plot into those axes.

plot(ax(1), 0:0.01:2*pi, sin(0:0.01:2*pi))

plot(ax(2), 0:10, 0:10)

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Answer 2

Voss 2022-2-25

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在 MATLAB Online 中打开

The problem: only one axes was created

figure;

ax1 = subplot(2,1,1,'Position', [0.05, 0.3, 0.92, 0.64]);

Warning: subplot ignores grid location arguments when Position is specified. This syntax will no longer be supported in a future release.

ax2 = subplot(2,1,2,'Position', [0.05, 0.09, 0.92, 0.1]);

Warning: subplot ignores grid location arguments when Position is specified. This syntax will no longer be supported in a future release.

findall(gcf(),'Type','axes')

ans =

Axes with properties: XLim: [0 1] YLim: [0 1] XScale: 'linear' YScale: 'linear' GridLineStyle: '-' Position: [0.0500 0.0900 0.9200 0.1000] Units: 'normalized' Show all properties

% (only one axes was created)

A solution: if you are specifying the positions directly, you can use axes() directly to create the axes rather than subplot():

figure;

ax1 = axes('Parent',gcf(),'Units','normalized','Position',[0.05, 0.3, 0.92, 0.64]);

ax2 = axes('Parent',gcf(),'Units','normalized','Position', [0.05, 0.09, 0.92, 0.1]);

findall(gcf(),'Type','axes')

ans =

2×1 Axes array: Axes Axes

% (two axes were created)