Fix the compliation error *for real* ... and restore performance

[ginac.git] / ginac / inifcns.h

diff --git a/ginac/inifcns.h b/ginac/inifcns.h
index 3230abacc0728da5280d0d2f827f2d44cf3f6634..ecfe561fd9a5167b5f245710562f402bf9a8fa4d 100644 (file)
--- 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) 1999-2009 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
@@ -17,12 +17,13 @@
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
-#ifndef __GINAC_INIFCNS_H__
-#define __GINAC_INIFCNS_H__
+#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)
 {
@@ -191,4 +212,4 @@ ex convert_H_to_Li(const ex& parameterlst, const ex& arg);
 
 } // namespace GiNaC
 
-#endif // ndef __GINAC_INIFCNS_H__
+#endif // ndef GINAC_INIFCNS_H