[Mne_analysis] Suppressing pyplot figures

[Mainak Jas]

        External Email - Use Caution        

Hi Dillan,

Did you try using the show parameter that is provided with plot_topomap
function? You should set it to False so that plt.show() is not called by
MNE.

The other option is to call matplotlib.use('Agg') at the very top of your
script before any imports. The only thing you can import before that is import
matplotlib.

Hope that helps,
Mainak

On Thu, Jun 27, 2019 at 4:06 PM Dillan Cellier <cellierdillan at gmail.com>
wrote:

>         External Email - Use Caution
>
> Hello MNE users,
>
> I am seeking help with figuring out how to prevent the figures from
> displaying when using this function:
> https://martinos.org/mne/stable/generated/mne.viz.plot_topomap.html#mne.viz.plot_topomap
>
> In using this mne.viz.plot_topomap, my aim is to save out the figure as a
> .png without it opening in a new window and without me having to manually
> close the figure. Here is how I am using the function:
>
> fig_a=plt.figure()
>
> mne.viz.plot_topomap(data_array, pos=mne.channels.read_montage('biosemi64').pos[:64,:2])
> plt.close(fig_a)
> fig_a.savefig('/home/dcellier/data_array_topoplot.png')
>
> The result is that the topomap figure is popping up and pauses the script
> until I close it. This is problematic because this code is nested in a for
> loop and will be called upon >100 times. It does successfully save the
> topomap in the intended directory.
>
> What I've tried, to no avail:
>
> import matplotlib.pyplot as plt
> plt.ioff() #turning interactive plotter off
> print(matplotlib.is_interactive()) #returns False
> matplotlib.use('Agg')
>
> as well as plt.close(). I also tried assigning the output of
> mne.viz.plot_topomap() to a variable, but it doesn't work to suppress the
> figure.
>
> Thank you in advance for any assistance!!
>
> Best wishes,
> Dillan
>
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