Active Set Type Algorithms for Nonnegative Matrix Factorization in Hyperspectral Unmixing

Algorithm 2

Active set type algorithm for NMF (AS).

	Input: , r, .
	Output: The approximation of the two factor matrices U and V.
	Step 1 (update the factor matrices alternatively)
	If the convergence criterion is satisfied, then stop; else,
	update with Algorithm 1 and,
	update with Algorithm 1.
	Step 2
	, go to Step 1.