Avoid x^0 and Order(x^0) terms together in series expansion.
[ginac.git] / ginac / inifcns_trans.cpp
index 9982853961286be457af33ee445339aeb4651f65..98e0caff36aaae386448293c36c4371837513f2e 100644 (file)
@@ -265,8 +265,12 @@ static ex log_series(const ex &arg,
                const ex &point = rel.rhs();
                const symbol foo;
                const ex replarg = series(log(arg), s==foo, order).subs(foo==point, subs_options::no_pattern);
-               epvector seq { expair(-I*csgn(arg*I)*Pi, _ex0),
-                              expair(Order(_ex1), order) };
+               epvector seq;
+               if (order > 0) {
+                       seq.reserve(2);
+                       seq.push_back(expair(-I*csgn(arg*I)*Pi, _ex0));
+               }
+               seq.push_back(expair(Order(_ex1), order));
                return series(replarg - I*Pi + pseries(rel, std::move(seq)), rel, order);
        }
        throw do_taylor();  // caught by function::series()
@@ -928,8 +932,12 @@ static ex atan_series(const ex &arg,
                        Order0correction += log((I*arg_pt+_ex_1)/(I*arg_pt+_ex1))*I*_ex_1_2;
                else
                        Order0correction += log((I*arg_pt+_ex1)/(I*arg_pt+_ex_1))*I*_ex1_2;
-               epvector seq { expair(Order0correction, _ex0),
-                              expair(Order(_ex1), order) };
+               epvector seq;
+               if (order > 0) {
+                       seq.reserve(2);
+                       seq.push_back(expair(Order0correction, _ex0));
+               }
+               seq.push_back(expair(Order(_ex1), order));
                return series(replarg - pseries(rel, std::move(seq)), rel, order);
        }
        throw do_taylor();
@@ -1534,8 +1542,12 @@ static ex atanh_series(const ex &arg,
                        Order0correction += log((arg_pt+_ex_1)/(arg_pt+_ex1))*_ex1_2;
                else
                        Order0correction += log((arg_pt+_ex1)/(arg_pt+_ex_1))*_ex_1_2;
-               epvector seq { expair(Order0correction, _ex0),
-                              expair(Order(_ex1), order) };
+               epvector seq;
+               if (order > 0) {
+                       seq.reserve(2);
+                       seq.push_back(expair(Order0correction, _ex0));
+               }
+               seq.push_back(expair(Order(_ex1), order));
                return series(replarg - pseries(rel, std::move(seq)), rel, order);
        }
        throw do_taylor();