Issue with 'transport' Module

Chandrasekar_Palanisamy

Hi.. I am attempting to run the tutorial programs. While running a program, I am encountering a problem with the 'transport' module. I have attached a snapshot for your reference.

fbeaudoin

Hello Chandrasekar_Palanisamy , thanks a lot for reaching out. Are you encountering this problem only with the gaafet_diamond tutorial ? If you run the examples/tutorials/gaafet.py tutorial, do you encounter the same issue ? Since QtAgg is a dependency of matplotlib, I suspect that the issue is related to plotting more than to the QTCAD solvers.
Have you tried plotting a simple function with pyplot inside the QTCAD environment.
For example, if you run the following script, do you get the same issue ?

from matplotlib import pyplot as plt
import numpy as np

fig = plt.figure(figsize=(8,5))
ax = fig.add_subplot(1,1,1)
x = np.linspace(0,1)
ax.plot(x,x**2)
plt.show()

Chandrasekar_Palanisamy

Hi fbeaudoin
Thanks for your response. For the following code, I get the expected result.. the graph is shown.. however when I use example programs which uses 'transport' module, the problem arises.

fbeaudoin

Chandrasekar_Palanisamy Thanks for the clarification, we will investigate further. Could you please tell me which OS you are running on?

fbeaudoin

I just realized that I was potentially looking at the wrong part of you screenshot.
The problem indeed seems to arise when you import the Junction class, and seems related to the fmm3dpy module.
This is a dependency of QTCAD and should be installed automatically through pip when creating the qtcad conda environment.
Here is a screenshot of the qtcad.yaml file which defines all QTCAD dependencies.

You can see that fmm3dpy is in the list of pip-installed dependencies.
For a reason that I do not understand yet, it did not work on your side.
Can you try to manually install fmm3dpy like this?

conda activate qtcad
pip install fmm3dpy

Normally, once fmm3dpy is correctly installed, the examples that use the transport module should run smoothly.
If it does not work, could you please send me the output of the second command, above?
In addition, if you could please let me know your OS and its version, for the record, that would be great!
Thanks again for your feedback.

Chandrasekar_Palanisamy

hi fbeaudoin

Really thanks for your assistance . after installingfmm3dpy manually the programs runs. Thank you

OS: Windows 10 pro

fbeaudoin

Thank you very much for your patience, and please do not hesitate if you need anything else from us.
I am surprised that you had this issue since we had several users install QTCAD with this OS (myself included), so we will keep an eye open for this problem in the future. Thanks again for reporting this issue to us.