blob: 898e5d8037d49ca0a9d5dcba802e9716d83c86b4 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
|
function g = rosegrad(x)
%ROSEGRAD Calculate gradient of Rosenbrock's function.
%
% Description
% G = ROSEGRAD(X) computes the gradient of Rosenbrock's function at
% each row of X, which should have two columns.
%
% See also
% DEMOPT1, ROSEN
%
% Copyright (c) Ian T Nabney (1996-2001)
% Return gradient of Rosenbrock's test function
nrows = size(x, 1);
g = zeros(nrows,2);
g(:,1) = -400 * (x(:,2) - x(:,1).^2) * x(:,1) - 2 * (1 - x(:,1));
g(:,2) = 200 * (x(:,2) - x(:,1).^2);
|
