How I can find index of element in array?

I know, that number, for example, 5, is an element in array X, but I don't know it's index. In Python, I can use:

X.index(5)

I realized this function, using for loop and if statement, but did Matlab doesn't have build-in similar function?

Answer 1

[James Tursa]

If you know the number exactly, then you can use:

result = find(X==5);

[Stephen Cobeldick]

Often logical indexing is more efficient, so you might only need this:

idx = X==5;