I feel a lot of textbooks skip this instrumental function, and other tutorials on this function are not focused. Let’s keep things very simple and focus on the bare essentials.
Focus on a vector, not a matrix.
Focus on find(some logical expression) rather than find(someVector)
Logical indexing is closely related to the find function. The expression A(A > 5) is equivalent to A(find(A > 5)). Therefore, better learn logical indexing first.