Mercurial > hg > camir-ismir2012
annotate toolboxes/FullBNT-1.0.7/netlab3.3/rosegrad.m @ 0:cc4b1211e677 tip
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| author | Daniel Wolff |
|---|---|
| date | Fri, 19 Aug 2016 13:07:06 +0200 |
| parents | |
| children |
| rev | line source |
|---|---|
| Daniel@0 | 1 function g = rosegrad(x) |
| Daniel@0 | 2 %ROSEGRAD Calculate gradient of Rosenbrock's function. |
| Daniel@0 | 3 % |
| Daniel@0 | 4 % Description |
| Daniel@0 | 5 % G = ROSEGRAD(X) computes the gradient of Rosenbrock's function at |
| Daniel@0 | 6 % each row of X, which should have two columns. |
| Daniel@0 | 7 % |
| Daniel@0 | 8 % See also |
| Daniel@0 | 9 % DEMOPT1, ROSEN |
| Daniel@0 | 10 % |
| Daniel@0 | 11 |
| Daniel@0 | 12 % Copyright (c) Ian T Nabney (1996-2001) |
| Daniel@0 | 13 |
| Daniel@0 | 14 % Return gradient of Rosenbrock's test function |
| Daniel@0 | 15 |
| Daniel@0 | 16 nrows = size(x, 1); |
| Daniel@0 | 17 g = zeros(nrows,2); |
| Daniel@0 | 18 |
| Daniel@0 | 19 g(:,1) = -400 * (x(:,2) - x(:,1).^2) * x(:,1) - 2 * (1 - x(:,1)); |
| Daniel@0 | 20 g(:,2) = 200 * (x(:,2) - x(:,1).^2); |