Wk 3 C1W3 Assignment

Course Q&A Math for Machine Learning Linear Algebra for Machine Learning and Data Sc...
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Hi,
I am struggling with Wk 3 Exercise 1. I am stuck with defining the transformation matrix, I have tried every option that I can think of but nothing is working. The parameter v is a numpy array of vectors to be stretched, what do you put in the brackets to define the transformation matrix in T?
This has been puzzling me for hours and I keep getting it wrong.
Many thanks in advance for anyone that can help.

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For T_stretch(), which is a linear transformation, you’re essentially using an identity matrix, but the non-zero elements on the main diagonal are ‘a’ instead of 1.

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Update:

To specify a matrix, the np.array() syntax requires the vectors to be enclosed in an outer set of square brackets.

The notebook has a good example in the cell that defines the “L()” function.