REGISTER_FUNCTION(abs, eval_func(abs_eval).
evalf_func(abs_evalf));
+
+//////////
+// Complex sign
+//////////
+
+static ex csgn_evalf(const ex & x)
+{
+ BEGIN_TYPECHECK
+ TYPECHECK(x,numeric)
+ END_TYPECHECK(csgn(x))
+
+ return csgn(ex_to_numeric(x));
+}
+
+static ex csgn_eval(const ex & x)
+{
+ if (is_ex_exactly_of_type(x, numeric))
+ return csgn(ex_to_numeric(x));
+
+ else if (is_ex_exactly_of_type(x, mul)) {
+ numeric oc = ex_to_numeric(x.op(x.nops()-1));
+ if (oc.is_real()) {
+ if (oc > 0)
+ // csgn(42*x) -> csgn(x)
+ return csgn(x/oc).hold();
+ else
+ // csgn(-42*x) -> -csgn(x)
+ return -csgn(x/oc).hold();
+ }
+ if (oc.real().is_zero()) {
+ if (oc.imag() > 0)
+ // csgn(42*I*x) -> csgn(I*x)
+ return csgn(I*x/oc).hold();
+ else
+ // csgn(-42*I*x) -> -csgn(I*x)
+ return -csgn(I*x/oc).hold();
+ }
+ }
+
+ return csgn(x).hold();
+}
+
+static ex csgn_series(const ex & x, const relational & rel, int order)
+{
+ const ex x_pt = x.subs(rel);
+ if (x_pt.info(info_flags::numeric)) {
+ if (ex_to_numeric(x_pt).real().is_zero())
+ throw (std::domain_error("csgn_series(): on imaginary axis"));
+ epvector seq;
+ seq.push_back(expair(csgn(x_pt), _ex0()));
+ return pseries(rel,seq);
+ }
+ epvector seq;
+ seq.push_back(expair(csgn(x_pt), _ex0()));
+ return pseries(rel,seq);
+}
+
+REGISTER_FUNCTION(csgn, eval_func(csgn_eval).
+ evalf_func(csgn_evalf).
+ series_func(csgn_series));
+
//////////
// dilogarithm
//////////
return Order(x).hold();
}
-static ex Order_series(const ex & x, const symbol & s, const ex & point, int order)
+static ex Order_series(const ex & x, const relational & r, int order)
{
// Just wrap the function into a pseries object
epvector new_seq;
- new_seq.push_back(expair(Order(_ex1()), numeric(min(x.ldegree(s), order))));
- return pseries(s, point, new_seq);
+ GINAC_ASSERT(is_ex_exactly_of_type(r.lhs(),symbol));
+ const symbol *s = static_cast<symbol *>(r.lhs().bp);
+ new_seq.push_back(expair(Order(_ex1()), numeric(min(x.ldegree(*s), order))));
+ return pseries(r, new_seq);
}
// Differentiation is handled in function::derivative because of its special requirements
/** Force inclusion of functions from initcns_gamma and inifcns_zeta
* for static lib (so ginsh will see them). */
-unsigned force_include_gamma = function_index_Gamma;
+unsigned force_include_tgamma = function_index_tgamma;
unsigned force_include_zeta1 = function_index_zeta1;
#ifndef NO_NAMESPACE_GINAC