static ex zeta_eval(ex const & x)
{
if (x.info(info_flags::numeric)) {
+ numeric y = ex_to_numeric(x);
// trap integer arguments:
- if (x.info(info_flags::integer)) {
- if (x.is_zero())
+ if (y.is_integer()) {
+ if (y.is_zero())
return -exHALF();
if (!x.compare(exONE()))
throw(std::domain_error("zeta(1): infinity"));
if (x.info(info_flags::odd))
return zeta(x).hold();
else
- // return bernoulli(ex_to_numeric(x))*pow(Pi,x)*numTWO().power(ex_to_numeric(x))/factorial(x);
- throw (std::domain_error("you found a missing feature"));
+ return abs(bernoulli(y))*pow(Pi,x)*numTWO().power(y-numONE())/factorial(y);
} else {
if (x.info(info_flags::odd))
- // return -bernoulli(1-ex_to_numeric(x))/(1-ex_to_numeric(x))
- throw (std::domain_error("you found a missing feature"));
- else
+ return -bernoulli(numONE()-y)/(numONE()-y);
+ else
return numZERO();
}
}
}
return zeta(x).hold();
}
-
+
static ex zeta_evalf(ex const & x)
{
BEGIN_TYPECHECK
static ex zeta_diff(ex const & x, unsigned diff_param)
{
- ASSERT(diff_param==0);
+ GINAC_ASSERT(diff_param==0);
return exZERO(); // should return zeta(numONE(),x);
}