Mercurial > hg > camir-aes2014
diff toolboxes/FullBNT-1.0.7/netlab3.3/rosegrad.m @ 0:e9a9cd732c1e tip
first hg version after svn
| author | wolffd |
|---|---|
| date | Tue, 10 Feb 2015 15:05:51 +0000 |
| parents | |
| children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/toolboxes/FullBNT-1.0.7/netlab3.3/rosegrad.m Tue Feb 10 15:05:51 2015 +0000 @@ -0,0 +1,20 @@ +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);