Plot a figure in the tutorial

User Support
1

Hi,

I’ve been through the first steps of the openmc tutorial : Modeling a Pin-Cell — OpenMC Documentation

However at step [23], where we are supposed to plot the hemisphere:

universe.plot(width=(2.0, 2.0))
image

I can’t see the drawing displaying on my screen.

Is there a command like universe.show() to actually plot the drawing ?

thank you for your help,
Djinekioule

2

In your Jupyter notebook, try putting %matplotlib inline in the very first cell to indicate that Matplotlib images should be displayed inline.

3

Ok thank you,
However, if I’m editing python on another text editor (let’s say vim) is there another way to display the figure when I run the python code ?
But maybe it’s out of the openmc topics.

[EDIT]
I’ve done something like this:
image

and download it from my “my_openmc” container to windows:

image
image762×24 2.31 KB

Is there an easier way to just display figure while being in the container prompt terminal ?
(I’ve tried eog “eog pin_cell.png” but it doesn’t work)

4

If you’re not inside a Jupyter notebook, you need to run:

import matplotlib.pyplot as plt
...
universe.plot(...)
plt.show()  # <-- causes figure to be displayed
5

Yes, I’ve also tried this option, unfortunately I’ve got no figure output :confused:
Maybe my session is not correctly configured ? ( I’m pretty noob with docker :slight_smile: )

Thank you for your help

6

@Djinekioule Did you try matplotlib.use() function to render figures inside docker?

import matplotlib
matplotlib.use('qt5agg')
7

No I didn’t know this command !
But it still doesn’t work, I’ve got several error messages by calling matplotlib.use(‘qt5agg’), it look like it requires the ‘PyQt5’ package. But even after installing the pyqt5 package I still get an error message, " ‘Qt5Agg’ requires the ‘qt5’ interactive framework, as ‘headless’ is currently running".

After some investigations the problem has been faced here https://www.py4u.net/discuss/220645
I’ve enabled the terminal.integrated.inheritEnv but now docker fails to launch lol
(it’s in french, sorry “Pour pouvoir utiliser cette fonctionnalité, la console hérité doit être désactivée” means ->“For this functionnallity to be used, consol inheritence has to be disabled”)

image

8

@Djinekioule Sorry, I couldn’t come up with any workable solution. If you really want this, please post on https://discourse.matplotlib.org/

9

Ok thank you for your help anyway :slight_smile: