This type of problem kills the Cody.
@Jean-Marie Sainthillier: thanks for pointing this out. I made some improvements and changed the function name, which should cause prior solutions to be invalidated.
@Fatih KIRCI: as originally posted, this problem was prone to be deleted. Instead, I improved it. Please take notes of these changes as to how you can improve any other problems you publish. For example, any problem should have multiple test cases.
Thank you Grant
Switch matrix to a column vector
Element by element multiplication of two vectors
Replace 0 to NaN!
Find the y=(1:x)
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