Invalid Handle Object with Subplot

Question

Erin MacMillan 2011-10-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/19679-invalid-handle-object-with-subplot

采纳的回答： Daniel Shub

Hi, I would appreciate any help on this matter, thank you for reading :)

I am attempting to do something like the following:

x1 = [1 2 3 4];

y1 = [2 4 6 8];

y2 = [4 8 12 16];

figure; hold on;

h1 = subplot(1,2,1);

hold on;

plot(x1,y1)

h2 = subplot(1,2,2);

hold on;

plot(x1,y2);

set(h1,'title','test1');

set(h2,'title','test2');

However, I get the error:

??? Error using ==> set Value must be a handle

I have also attempted to set both the figure and subplot properties to include 'NextPlot','add' but this did not help.

Thanks for all suggestions!

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Answer 1

Daniel Shub 2011-10-28

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The problem is that the property title requires a handle to a text object and not a string. The help http://www.mathworks.com/help/releases/R2011a/techdoc/ref/axes_props.html deals with this. You can create a text object in the appropriate axis with:

axes(h1);
set(h1,'title',text('string', 'test1'));
axes(h2);
set(h2,'title',text('string', 'test2'));

You might just want to use:

title(h1, 'test1');

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Daniel Shub 2011-10-28

That is because you left out the axes(h1) part. The text command puts the text into the current axes (in this case h2) and you want it in h1.

Erin MacMillan 2011-10-28

Yes that was it! Thank you very much!!

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Answer 2

the cyclist 2011-10-28

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https://ww2.mathworks.cn/matlabcentral/answers/19679-invalid-handle-object-with-subplot#answer_26015

在 MATLAB Online 中打开

Are you just trying to set titles of each subplot?

x1 = [1 2 3 4];
y1 = [2 4 6 8];
y2 = [4 8 12 16];
figure; hold on;
h1 = subplot(1,2,1);
title('test1')
hold on;
plot(x1,y1)
h2 = subplot(1,2,2);
title('test2')
hold on;
plot(x1,y2);

Part of the problem of the way you were trying to do it was that h1 and h2 are the handles for the lines plotted, not for the plotting axes.

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Erin MacMillan 2011-10-28

Hi,

I am actually trying to do something a lot more complicated, but I boiled the problem down to that example. I need to set some properties of a subplot axes when the plots are run in a loop, so the handles get overwritten. I think you have stated the root of the problem: "h1 and h2 are the handles for the lines plotted, not for the plotting axes". How do I make a handle for the plotting axes in a subplot?

Thanks!

Daniel Shub 2011-10-28

The handles h1 and h2 are handles to the axes since they are returned by subplot. The problem is that the title property does not want a string, but rather a handle.

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