error in handle when save multiple figures

Question

JING JIAO 2019-8-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/476051-error-in-handle-when-save-multiple-figures

评论： JING JIAO 2019-9-11

I am running a loop to save multiple figures, in one loop the figure is coded as:

subplot(4,3,1)
plot(1:timesteps,S_RT(1:timesteps),'-b');

where S_RT(1:timesteps) is a variable that changes every loop.

then I save this graph as the following where i, jj, k and h indicate the four nested loop:

filename = sprintf('Tran_RT %d vs Tran_WT %d vs Mig %d vs Grow %d.png',i,jj,k,h);
saveas(gcf,filename);
clf;

It sometimes shows error as:

Error using checkArgsForHandleToPrint
Handle input argument contains nonhandle values.
Error in checkArgsForHandleToPrint
Error in print>LocalCreatePrintJob (line 100)
handles = checkArgsForHandleToPrint(0, varargin{:});
Error in print (line 38)
[pj, inputargs] = LocalCreatePrintJob(varargin{:});
Error in saveas (line 181)
        print( h, name, ['-d' dev{i}] ) 

Is that due to I used "subplot"? How can I handle this issue? Thanks in advance.

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Walter Roberson 2019-8-14

I would suspect that the clf is getting executed before the saveas() has finished. You might need a pause() to get the saveas() time to execute.

JING JIAO 2019-9-11

Thanks, this is what I did, it worked.

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Answer 1

Shashank Gupta 2019-8-26

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在 MATLAB Online 中打开

If we look at the error

Handle input argument contains non handle values

A non-handle value is passed when it expected a handle, that in turn is caused by "saveas" function.

The input argument to this function may not be handle anymore. Although you are using clf command to remove the figure, it shouldn’t have caused the problem as clf only remove the graphical content of the figure. Try looking at your code and see if you are removing the figure window as well because that will remove the handle and thus triggered the error. You can also try putting a breakpoint at "saveas" function and run the code. At the breakpoint inspect the values that are passed to "saveas" and check if the proper handle is passed.