In math for machine learning, course 1 (linear algebra), week 4, programming assignment of finding the reflection of matrix on y axis and its eigen values and eigen vectors.

I am not sure why multiplying the matrix (to get reflection) with -1 0, 0 1 is not satisfying the unit test. Can someone please share the understanding of reflection on Y axis for a matrix?

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As a suggestion for improving the assignment, the wording of the assignment implies that it is looking for a reflection of the previous matrix A in the y-axis. This misled me for a long time.

Instead the assignment is looking for a general matrix that can be used to transform the base vectors as a reflection in the y-axis.