- ex::series() catches and re-throws exceptions happening during expansion

[ginac.git] / ginac / inifcns_trans.cpp

diff --git a/ginac/inifcns_trans.cpp b/ginac/inifcns_trans.cpp
index 14921f46cccd3eec28084c7d3c82b6f413ca521c..87a77cb2b97e1c0a42755b09ec2184f7923b920f 100644 (file)
--- a/ginac/inifcns_trans.cpp
+++ b/ginac/inifcns_trans.cpp
@@ -31,6 +31,7 @@
 #include "power.h"
 #include "relational.h"
 #include "symbol.h"
+#include "pseries.h"
 #include "utils.h"
 
 #ifndef NO_NAMESPACE_GINAC
@@ -143,9 +144,20 @@ static ex log_deriv(const ex & x, unsigned deriv_param)
     return power(x, _ex_1());
 }
 
+static ex log_series(const ex & x, const symbol & s, const ex & pt, int order)
+{
+       if (x.subs(s == pt).is_zero()) {
+               epvector seq;
+               seq.push_back(expair(log(x), _ex0()));
+               return pseries(s, pt, seq);
+       } else
+               throw do_taylor();
+}
+
 REGISTER_FUNCTION(log, eval_func(log_eval).
                        evalf_func(log_evalf).
-                       derivative_func(log_deriv));
+                       derivative_func(log_deriv).
+                       series_func(log_series));
 
 //////////
 // sine (trigonometric function)