find

Find indices of nonzero elements

k = find(X)
k = find(X, n)
k = find(X, n, direction)

Returns the linear indices of nonzero elements in X. Optionally returns only the first or last n indices.

Name	Description
X	Input array
n(optional)	Number of indices to return
direction(optional)	'first' (default) or 'last' - which indices to return

Vector of indices (1-based)

>> find([1 0 3 0 5])

1  3  5

>> find([1 0 3 0 5], 2)

1  3

>> find([1 0 3 0 5], 2, 'last')

3  5

>> A = [1 2 3 4 5]; find(A > 3)

4  5

Equana