accessing subplot grid title (sgtitle) from figure properties

Question

hxen 2023-6-14

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https://ww2.mathworks.cn/matlabcentral/answers/1982589-accessing-subplot-grid-title-sgtitle-from-figure-properties

编辑： hxen 2023-6-14

How to get the sgtitle of a figure directly from the properties?

For the fig title, this is fairly straightforward and ideal when wishing to save a large volume of open figures automatically:

titleName = gca(figObj).Title.String

However there is no obvious property name for subplot grid title (sgtitle) that can be readily accessed. Yet clearly the sgtitle information is retained after closing as it reappears upon reopening a figure. Is it just that this property is not accessible to users? This seems unlikely, especially given the many dozens of properties available.

Cheers.

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Answer 1

Star Strider 2023-6-14

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https://ww2.mathworks.cn/matlabcentral/answers/1982589-accessing-subplot-grid-title-sgtitle-from-figure-properties#answer_1255084

在 MATLAB Online 中打开

The sgtitle object is a child of the figure. The problem is that it doesn’t appear straightforward to access using findobj.

x = [1;1]*(0:15);

y = randn(2, size(x,2));

figure

subplot(2,1,1)

plot(x(1,:), y(1,:))

xlabel('x_1')

ylabel('y_1')

title('Subplot #1')

subplot(2,1,2)

plot(x(2,:), y(2,:))

xlabel('x_2')

ylabel('y_2')

title('Subplot #2')

sgtitle('Subplots')

hf = gcf;

Kids = hf.Children

Kids =

3×1 graphics array: Text (Subplots) Axes (Subplot #2) Axes (Subplot #1)

obj = findobj(gcf)

obj =

6×1 graphics array: Figure (1) Text (Subplots) Axes (Subplot #2) Axes (Subplot #1) Line Line

sgt = findobj(hf, 'Type','Text')

sgt =

0×0 empty GraphicsPlaceholder array.

sgt = findobj(hf.Children, 'Type','Text')

sgt =

0×0 empty GraphicsPlaceholder array.

sgt = Kids(1)

sgt =

Text (Subplots) with properties: String: 'Subplots' FontSize: 13 FontWeight: 'normal' FontName: 'Helvetica' Color: [0 0 0] Interpreter: 'tex' Show all properties

It’s definitely possible to get it, however its type appears not to correspond with what I’d normally expect. That appears to be some undocumented property.

.

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hxen 2023-6-14

Thanks Strider. I could find no documentation and you showed me a neat way to hunt for propoerties not readily shown.

Star Strider 2023-6-14

As always, my pleasure!

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Answer 2

Steven Lord 2023-6-14

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1982589-accessing-subplot-grid-title-sgtitle-from-figure-properties#answer_1255134

在 MATLAB Online 中打开

The object created and returned by sgtitle has a Type that is not the same as its class.

x = [1;1]*(0:15);

y = randn(2, size(x,2));

figure

subplot(2,1,1)

plot(x(1,:), y(1,:))

xlabel('x_1')

ylabel('y_1')

title('Subplot #1')

subplot(2,1,2)

plot(x(2,:), y(2,:))

xlabel('x_2')

ylabel('y_2')

title('Subplot #2')

h = sgtitle('Subplots');

h.Type

ans = 'subplottext'

hf = gcf;

sgt = findobj(hf, 'Type','subplottext')

sgt =

Text (Subplots) with properties: String: 'Subplots' FontSize: 13 FontWeight: 'normal' FontName: 'Helvetica' Color: [0 0 0] Interpreter: 'tex' Show all properties

sgt == h % true

ans = logical

1

You can see the list of properties of that object in the documentation.

Of course, even easier is to call sgtitle with an output argument and keep that variable around, as I did with the variable named h.

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Star Strider 2023-6-14

Thank you!

I don’t usually look at the Identifiers section of the documentation. I’ll start.

hxen 2023-6-14

编辑：hxen 2023-6-14

You guys are awesome and love this community who are taking their time out to share their experience and knowledge. I've learned a lot with a recent needed analysis project from things I thought I new (like data precission handling) to arguably more esoteric points. The feedback I've gotten here has been very helpful! Cheers.

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