Finding column index of the first instance of 1
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I have a logical array like this:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/985090/image.png)
I want to extrat the colum index of the cells where the first instance of 1 is detected. Like this:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/985095/image.png)
For example, you see here that the first two rows show 4, because that is where 1 is first detected.
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Walter Roberson
2022-5-2
C = sum(cumprod(~X, 2),1) + 1;
C will be one more than the number of columns for any row that has no 1.
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