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In a array, finding x for the first instance of y.

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I have a 2d array where x is time and y is result. I am trying to find the first time when y==1.

Accepted Answer

Star Strider
Star Strider on 8 Apr 2021
Depending on what you want:
idx = find(y>=1, 1, 'first');
time = x(idx);
idx = find(y>=1, 1, 'first');
time = interp1(y(idx-2:idx), x(idx-2:idx), 1);
The interpolation works if ‘y’ is not exactly equal to 1 and you want to know what that interpolated time would be.
Choose the approach that works best in the context of your problem.

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