X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Finifcns.h;h=b8349d1bba898d93e292debc4aef6ecbc313639d;hp=9ce66942b9556cd524395d40a28667693cc32de1;hb=6ff92476a4dcd32f9a0c6f59c95c74812ea86fef;hpb=da64e515abf7243bc4c84ca3631470931c4e6691

diff --git a/ginac/inifcns.h b/ginac/inifcns.h
index 9ce66942..b8349d1b 100644
--- a/ginac/inifcns.h
+++ b/ginac/inifcns.h
@@ -3,7 +3,7 @@
  *  Interface to GiNaC's initially known functions. */
 
 /*
- *  GiNaC Copyright (C) 1999-2005 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2008 Johannes Gutenberg University Mainz, Germany
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -23,6 +23,7 @@
 #ifndef __GINAC_INIFCNS_H__
 #define __GINAC_INIFCNS_H__
 
+#include "numeric.h"
 #include "function.h"
 #include "ex.h"
 
@@ -30,10 +31,19 @@ namespace GiNaC {
 
 /** Complex conjugate. */
 DECLARE_FUNCTION_1P(conjugate_function)
+
+/** Real part. */
+DECLARE_FUNCTION_1P(real_part_function)
+
+/** Imaginary part. */
+DECLARE_FUNCTION_1P(imag_part_function)
 	
 /** Absolute value. */
 DECLARE_FUNCTION_1P(abs)
 	
+/** Step function. */
+DECLARE_FUNCTION_1P(step)
+	
 /** Complex sign. */
 DECLARE_FUNCTION_1P(csgn)
 
@@ -178,6 +188,17 @@ DECLARE_FUNCTION_1P(Order)
 
 ex lsolve(const ex &eqns, const ex &symbols, unsigned options = solve_algo::automatic);
 
+/** Find a real root of real-valued function f(x) numerically within a given
+ *  interval. The function must change sign across interval. Uses Newton-
+ *  Raphson method combined with bisection in order to guarantee convergence.
+ *
+ *  @param f  Function f(x)
+ *  @param x  Symbol f(x)
+ *  @param x1  lower interval limit
+ *  @param x2  upper interval limit
+ *  @exception runtime_error (if interval is invalid). */
+const numeric fsolve(const ex& f, const symbol& x, const numeric& x1, const numeric& x2);
+
 /** Check whether a function is the Order (O(n)) function. */
 inline bool is_order_function(const ex & e)
 {