Make pseries also work for non-rational functions. Patch by Alexei.

[ginac.git] / ginac / pseries.cpp

diff --git a/ginac/pseries.cpp b/ginac/pseries.cpp
index cc73412b1d1f8e494cc079eb47433fead2d4b0cc..b63d46403b0dff179ed3eb328355db876de11923 100644 (file)
--- a/ginac/pseries.cpp
+++ b/ginac/pseries.cpp
@@ -4,7 +4,7 @@
  *  methods for series expansion. */
 
 /*
- *  GiNaC Copyright (C) 1999-2007 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2005 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
@@ -1035,7 +1035,10 @@ ex power::series(const relational & r, int order, unsigned options) const
        }
        const ex& sym = r.lhs();
        // find existing minimal degree
-       int real_ldegree = basis.expand().ldegree(sym-r.rhs());
+       ex eb = basis.expand();
+       int real_ldegree = 0;
+       if (eb.info(info_flags::rational_function))
+               real_ldegree = eb.ldegree(sym-r.rhs());
        if (real_ldegree == 0) {
                int orderloop = 0;
                do {