Figures in Jupyter Notebooks not being found

[furnstahl]

This was happening both for notebooks imported into the Jupyter Book and also when pressing the Binder button, even though the figures worked when the notebooks were run standalone.

[furnstahl]

This was fixed when we renamed the directory with figures to be _images and used an appropriate relative path. With the current directory structure this is ../../_images/.

I'm unsure how general this fix is, but you can also figure out the correct path by using the "view source" feature of your browser when on the page where the figure is supposed to appear.

[furnstahl]

For a standalone notebook, if starting jupyter notebook in the sub-directory of the notebook the figures are not found with the `../../_images/ path. It will work if the notebook is started in the LectureNotes directory.

How do we set it up so it works either way?

[furnstahl]

We could put the url for the image at the github repository.

[furnstahl]

The url from github didn't work, at least as implemented.

[furnstahl]

We can use the raw.githubusercontent.com URL prefix to make this work. Here is an example from the lighthouse problem notebook. Just replace the image filename in _images.

https://raw.githubusercontent.com/buqeye/LearningFromData/main/LectureNotes/_images/radioactive_lighthouse_problem_figure.png