FIND for n-D: Find indices and values of nonzero elements in n-D matrix

FINDN is the FIND function for n-D matrix

Just like the FIND function in Matlab, FINDN is a simple function which will find the indices and values of nonzero elements in a n-D matrix

function [sub v] = findn(A)
% INPUT: A: n-D matrix
% OUTPUT: sub: the k x n index matrix (k is the number of the nonzeros)
v: a column or row vector v of the nonzero entries in A
USAGE:
[sub ] = findn(A)

TESTING CODE:

A = zeros(4,3,5,7);
A(4,2,1,4)=1;
A(2,3,4,6)=2;
A(1,2,3,4)=3;
findn(A)

AUTHOR:
Brian H. Hui ([e-mail])
PhD candidate, Electrical Engineering, University of Southern California