Hi everyone,
When I submit my assignment “Eigenvalues and Eigenvectors” on the week 4, I had the following error:
There was a problem compiling the code from your notebook. Details:
name 'P' is not defined
What might cause this? The variable P does not even begin with the 1st exercise, but only with the 4th…
I am seeing the same issue. @alexmaszanski were you able to resolve it?
Not yet
But I also wrote to the support on the course page, because it does seem strange.
So I used # grade-up-to-here tag in the end of cells I wanted to evaluated. I did it up to the 3rd exercise and received
Failed test case: Object P has incorrect type.. Expected: <class 'numpy.ndarray'>, but got: <class 'NoneType'>.
That’s weird, because I have P = np.array ...
May be the notebook needs a complete reset.
I was able to refresh the notebook and redo the assignment(I saved a copy my finished notebook so I can copy over the answers to the refreshed one)
The grading went through fine.
That’s great! How did you reset the notebook?
In Week1 of this course, there is a reading page on Refreshing the workspace.
https://www.coursera.org/learn/machine-learning-linear-algebra/supplement/cfleU/optional-downloading-your-notebook-and-refreshing-your-workspace
Yeah, it’s working! Thank you my man, you made my day!! 
Had the same issue and you solved it. Thanks!
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