support both Jones and Gablonsky direct variants

darcs-hash:20070824133727-c8de0-7bc31c4491e8d18853f961ed48aba7c4c6c3ab77.gz

README

@@ -15,4 +15,7 @@ link it with -lnlopt -lm.  You may need to use the C++ compiler to link
 in order to include the C++ libraries (which are used internally by NLopt,
 even though it has a C API).
 
+The minimization function, nlopt_minimize, is described in the man
+page (api/nlopt_minimize.3, which is installed by 'make install'.
+
 Interfaces for other languages may be added in the future.

api/nlopt.c

@@ -6,6 +6,7 @@
 
 static const char nlopt_algorithm_names[NLOPT_NUM_ALGORITHMS][128] = {
      "DIRECT (global)",
+     "DIRECT-L (global)",
      "Subplex (local)",
      "StoGO (global)",
      "Low-storage BFGS (LBFGS) (local)"
@@ -74,11 +75,15 @@ nlopt_result nlopt_minimize(
 
      switch (algorithm) {
 	 case NLOPT_GLOBAL_DIRECT:
+	 case NLOPT_GLOBAL_DIRECT_L:
 	      switch (direct_optimize(f_direct, &d, n, lb, ub, x, fmin,
 				      maxeval, 500, ftol_rel, ftol_abs,
 				      xtol_rel, xtol_rel,
 				      DIRECT_UNKNOWN_FGLOBAL, -1.0,
-				      NULL, DIRECT_GABLONSKY)) {
+				      NULL, 
+				      algorithm == NLOPT_GLOBAL_DIRECT
+				      ? DIRECT_ORIGINAL
+				      : DIRECT_GABLONSKY)) {
 		  case DIRECT_INVALID_BOUNDS:
 		  case DIRECT_MAXFEVAL_TOOBIG:
 		  case DIRECT_INVALID_ARGS:

api/nlopt.h

@@ -13,6 +13,7 @@ typedef double (*nlopt_func)(int n, const double *x,
 typedef enum {
      /* non-gradient algorithms */
      NLOPT_GLOBAL_DIRECT = 0,
+     NLOPT_GLOBAL_DIRECT_L,
      NLOPT_LOCAL_SUBPLEX,
 
      /* gradient-based algorithms */

api/nlopt_minimize.3

@@ -28,6 +28,9 @@ nlopt_minimize \- Minimize a multivariate nonlinear function
 .BI "                            const double* " "xtol_abs" ,
 .BI "                            int " "maxeval" ,
 .BI "                            double " "maxtime" );
+.sp
+You should link the resulting program with the linker flags
+-lnlopt -lm on Unix.
 .fi
 .SH DESCRIPTION
 .BR nlopt_minimize ()