- put everything in "GiNaC" namespace

[ginac.git] / ginac / inifcns_gamma.cpp

diff --git a/ginac/inifcns_gamma.cpp b/ginac/inifcns_gamma.cpp
index b94ee27ddb55a38009624656fc4df6c0d993ab42..5683fd21328d91133d8f311cd6f8e804d77495fe 100644 (file)
--- a/ginac/inifcns_gamma.cpp
+++ b/ginac/inifcns_gamma.cpp
@@ -2,10 +2,35 @@
  *
  *  Implementation of Gamma function and some related stuff. */
 
+/*
+ *  GiNaC Copyright (C) 1999 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
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  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
+ */
+
 #include <vector>
 #include <stdexcept>
 
-#include "ginac.h"
+#include "inifcns.h"
+#include "ex.h"
+#include "constant.h"
+#include "numeric.h"
+#include "power.h"
+#include "symbol.h"
+
+namespace GiNaC {
 
 //////////
 // gamma function
@@ -37,14 +62,14 @@ ex gamma_eval(ex const & x)
                 numeric n = ex_to_numeric(x).sub(numHALF());
                 numeric coefficient = doublefactorial(n.mul(numTWO()).sub(numONE()));
                 coefficient = coefficient.div(numTWO().power(n));
-                return mul(coefficient,power(Pi,numHALF()));
+                return coefficient * power(Pi,numHALF());
             } else {
                 // trap negative x=(-n+1/2)
                 // gamma(-n+1/2) -> Pi^(1/2)*(-2)^n/(1*3*..*(2*n-1))
                 numeric n = abs(ex_to_numeric(x).sub(numHALF()));
                 numeric coefficient = numeric(-2).power(n);
                 coefficient = coefficient.div(doublefactorial(n.mul(numTWO()).sub(numONE())));;
-                return mul(coefficient,power(Pi,numHALF()));
+                return coefficient * power(Pi,numHALF());
             }
         }
     }
@@ -64,12 +89,12 @@ ex gamma_diff(ex const & x, unsigned diff_param)
 {
     ASSERT(diff_param==0);
 
-    return power(x, -1);       //!!
+    return power(x, -1);       // FIXME
 }
 
 ex gamma_series(ex const & x, symbol const & s, ex const & point, int order)
 {
-       //!! Only handle one special case for now...
+       // FIXME: Only handle one special case for now...
        if (x.is_equal(s) && point.is_zero()) {
                ex e = 1 / s - EulerGamma + s * (power(Pi, 2) / 12 + power(EulerGamma, 2) / 2) + Order(power(s, 2));
                return e.series(s, point, order);
@@ -78,3 +103,5 @@ ex gamma_series(ex const & x, symbol const & s, ex const & point, int order)
 }
 
 REGISTER_FUNCTION(gamma, gamma_eval, gamma_evalf, gamma_diff, gamma_series);
+
+} // namespace GiNaC