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Find the first element of a column in a matrix that has a value equal to zero

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I have an m by n matrix and I'm interested in the nth column. Initially all of the values in the nth column are greater than zero. As the code executes, at some point, a specific row in the nth column will equal zero. I want to determine which row that is. One issue is that after this first instance of zero, all of the subsequent rows in the nth column will also equal zero. I just want the first row in the last column that has a value of zero.
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Robert Demyanovich
Robert Demyanovich on 4 Jun 2021
This answer worked fine. However, now I realize that I need the value of m that matches the value of n found by the answer.

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