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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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Robert Demyanovich 2021-6-3

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https://ww2.mathworks.cn/matlabcentral/answers/847320-find-the-first-element-of-a-column-in-a-matrix-that-has-a-value-equal-to-zero

评论： Robert Demyanovich 2021-6-4

采纳的回答： Dyuman Joshi

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 2021-6-4

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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Dyuman Joshi 2021-6-3

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https://ww2.mathworks.cn/matlabcentral/answers/847320-find-the-first-element-of-a-column-in-a-matrix-that-has-a-value-equal-to-zero#answer_716230

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r=find(A(:,n)==0,1) %A is your m by n matrix after executing the code

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