1 files changed, 21 insertions, 2 deletions
diff --git a/numlib/powell.h b/numlib/powell.h
index 4b86573..642cb65 100755
--- a/numlib/powell.h
+++ b/numlib/powell.h
@@ -15,6 +15,8 @@
 	extern "C" {
 #endif
 
+#define DFUNC_NRV	1e100
+
 /* Standard interface for powell function */
 /* return 0 on sucess, 1 on failure due to excessive itterations */
 /* Result will be in cp */
@@ -32,7 +34,7 @@ void (*prog)(void *pdata, int perc),		/* Optional progress percentage callback *
 void *pdata				/* Opaque data needed by prog() */
 );
 
-/* Conjugate Gradient optimiser */
+/* Conjugate Gradient optimiser using partial derivatives. */
 /* return 0 on sucess, 1 on failure due to excessive itterations */
 /* Result will be in cp */
 int conjgrad(
@@ -43,7 +45,8 @@ double s[],				/* Size of initial search area */
 double ftol,			/* Tollerance of error change to stop on */
 int maxit,				/* Maximum iterations allowed */
 double (*func)(void *fdata, double tp[]),		/* Error function to evaluate */
-double (*dfunc)(void *fdata, double dp[], double tp[]),		/* Gradient function to evaluate */
+double (*dfunc)(void *fdata, double dp[], double tp[]),		/* Gradient & function to evaluate */
+						/* dfunc() should return DFUNC_NRV if it doesn't return function value */
 void *fdata,			/* Opaque data needed by function */
 void (*prog)(void *pdata, int perc),		/* Optional progress percentage callback */
 void *pdata				/* Opaque data needed by prog() */
@@ -69,6 +72,22 @@ double (*func)(void *fdata, double tp[]),		/* Error function to evaluate */
 void *fdata			/* Opaque data for func() */
 );
 
+/* Line bracketing and minimisation routine using derivatives. */
+/* Return value at minimum. */
+double linmind(
+double cp[],		/* Start point, and returned value */
+double xi[],		/* Search vector */
+int di,				/* Dimensionality */
+#ifdef ABSTOL
+double ftol,		/* Absolute tolerance to stop on */
+#else
+double ftol,		/* Relative tolerance to stop on */
+#endif
+double (*func)(void *fdata, double tp[]),		/* Error function to evaluate */
+double (*dfunc)(void *fdata, double dp[], double tp[]),		/* Gradient & function to evaluate */
+void *fdata			/* Opaque data for func() */
+);
+
 #ifdef __cplusplus
 	}
 #endif