function y = rosen(x)%ROSEN	Calculate Rosenbrock's function.%%	Description%	Y = ROSEN(X) computes the value of Rosenbrock's function at each row%	of X, which should have two columns.%%	See also%	DEMOPT1, ROSEGRAD%%	Copyright (c) Ian T Nabney (1996-2001)% Calculate value of Rosenbrock's function: x should be nrows by 2 columnsy = 100 * ((x(:,2) - x(:,1).^2).^2) + (1.0 - x(:,1)).^2;