From: stevenj <stevenj@alum.mit.edu>
Date: Mon, 3 Sep 2007 19:22:07 +0000 (-0400)
Subject: bug fix in grosenbrock gradient (no wonder StoGO etc. were so bad for this functioon)
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=commitdiff_plain;h=abb1d8f7cdfdd69f7539860d73d2c9bae5a21467;p=nlopt.git

bug fix in grosenbrock gradient (no wonder StoGO etc. were so bad for this functioon)

darcs-hash:20070903192207-c8de0-cef32242ac0bc7308b24d07ae31e2e9e1c6c463a.gz
---

diff --git a/test/testfuncs.c b/test/testfuncs.c
index cff3097..3865e20 100644
--- a/test/testfuncs.c
+++ b/test/testfuncs.c
@@ -125,7 +125,7 @@ static double grosenbrock_f(int n, const double *x, double *grad, void *data)
 	  double a = x[i+1] - x[i] * x[i], b = 1 - x[i];
 	  if (grad) {
 	       grad[i] += -400 * a * x[i] - 2*b;
-	       grad[i+1] = -200 * a;
+	       grad[i+1] = 200 * a;
 	  }
 	  f += 100 * sqr(a) + sqr(b);
      }