Empty figure window when plotted from Python

Question

SHC 2024-4-22

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2110006-empty-figure-window-when-plotted-from-python

评论： SHC 2024-4-26

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Hi,

I tried to plot a MATLAB figure using a MATLAB funciton from Python script.

I used the following MATLAB funtion (plot_test.m) to draw a simple line graph:

function h = plot_test()
    clear; close all;
    h = plot(1:10, 2:11, 'o:')
    grid on;
end

I called the MATLAB funciton from Python (plot_test.py):

import matlab.engine
eng = matlab.engine.start_matlab()
h = eng.plot_test()
input("Press Enter to quit...")
eng.quit()

The MATLAB figure window was opened. But it was empty.

Could you help me?

The system environments are as follows:

MATLAB: R2023b
Python: 3.11.8
OS: Fedora Linux 6.8.6-100.fc38.x86_64
Shell: bash 5.2.26
Resolution: 1680x1050
Gnome:44.1

I suspect that the resolution might have some impact on this result because when I run the same code in another Fedora machine with 1920x1080 monitor, it shows the graph.

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vidyesh 2024-4-22

Can you share MATLAB version and python version as well.

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Answer 1

Debadipto 2024-4-25

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2110006-empty-figure-window-when-plotted-from-python#answer_1447776

Hi @SHC,

To ensure that the MATLAB figure is correctly displayed when called from a Python script, you can make modifications to the MATLAB function to explicitly set the figure's visibility and to force immediate rendering of the plot. Here's how you can adjust your "plot_test.m" MATLAB function:

function h = plot_test()

clear; close all;

figure('Visible', 'on'); % Explicitly set the figure to be visible

h = plot(1:10, 2:11, 'o:');

grid on;

drawnow; % Force MATLAB to draw the figure's content immediately

pause(0.1); % Introduce a brief pause to ensure the content is fully rendered

end

Hope it helps!