Error when plotting in parfor loop
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David Perlmutter
el 19 de Dic. de 2018
Comentada: Walter Roberson
el 3 de Sept. de 2021
I'd like to plot inside a parfor loop, but am getting an error I don't understand.
parfor i=1:10
figure;
end
Cannot set WindowStyle to 'docked' when MATLAB is
started with no display or when the -noFigureWindows
option is specified.
I have changed my default window style but got the same error
set(0,'defaultfigurewindowstyle','normal')
set(0,'defaultfigurewindowstyle','docked')
1 comentario
Mark Sherstan
el 19 de Dic. de 2018
Are you running any other code before the loop? What version of MATLAB and parrallel toolbox are your using?
Respuesta aceptada
David Perlmutter
el 19 de Dic. de 2018
1 comentario
Walter Roberson
el 19 de Dic. de 2018
It does sound like you have set(0,'defaultfigurewindowstyle','docked') in effect. Check for a startup.m that might be setting it.
Más respuestas (5)
Walter Roberson
el 19 de Dic. de 2018
It is never possible to plot to the display inside any parallel construct. The workers are in separate processes that do not have access to the graphics subsystem.
You would need to either:
- Calculate all of the data in the parfor and then do the plotting after the parfor; or
- Use parallel.pool.DataQueue or parallel.pool.PollableDataQueue and send() data back to the client to do the plotting such as by using foreach
0 comentarios
Mark Sherstan
el 19 de Dic. de 2018
Editada: Mark Sherstan
el 19 de Dic. de 2018
To save a figure in a parfor loop you must do the following as found here. Otherwise save the data and plot after as mentioned by Walter.
parfor i=1:5
figure(i)
plot(rand(i*10,1));
saveas(gcf,['temp' num2str(i) '.jpg']);
end
Try the code above and let us know if the error continues.
0 comentarios
David Perlmutter
el 19 de Dic. de 2018
1 comentario
Walter Roberson
el 19 de Dic. de 2018
Note that the plots are not just "invisible": they are in a different process. You would need to save them or else find a way to bring back the figures.
David Perlmutter
el 20 de Dic. de 2018
2 comentarios
Jackson Jewett
el 3 de Sept. de 2021
Could you clarify this? Are you able to display plots within a forloop? Could you advise what you commented out in order to see these results? Thank you!
Walter Roberson
el 3 de Sept. de 2021
David was saving the plots inside the loop; see https://www.mathworks.com/matlabcentral/answers/436570-error-when-plotting-in-parfor-loop#answer_353192
You can save plots inside of parfor; you just cannot display them to the user from inside of the parfor.
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