MATLAB: How do you find the index of the first true value in a logical vector

first trueindexinglogical?

I need to find the index of the first 1 in a logical vector.
For example, I have a logical vector like this: V = [ 0 1 0 0 1 0 1 ] and I need a function/code that will tell me that the first true value is at index 2.
(If you can't tell from my question, I'm a beginner at Matlab.) Thanks so much for your help! I really appreciate it 🙂

Best Answer

Use the find function:
V1 = find(V, 1, 'first')
The find function (in its most fundamental application) locates all non-zero entries in its argument. The syntax here tells it to locate only one such value, in this instance the first one it finds, and output the index of that value.
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