def _create_evalf_table():
global evalf_table
evalf_table = {
C.Symbol : evalf_symbol,
C.Dummy : evalf_symbol,
C.Real : lambda x, prec, options: (x._mpf_, None, prec, None),
C.Rational : lambda x, prec, options: (from_rational(x.p, x.q, prec), None, prec, None),
C.Integer : lambda x, prec, options: (from_int(x.p, prec), None, prec, None),
C.Zero : lambda x, prec, options: (None, None, prec, None),
C.One : lambda x, prec, options: (fone, None, prec, None),
C.Half : lambda x, prec, options: (fhalf, None, prec, None),
C.Pi : lambda x, prec, options: (mpf_pi(prec), None, prec, None),
C.Exp1 : lambda x, prec, options: (mpf_e(prec), None, prec, None),
C.ImaginaryUnit : lambda x, prec, options: (None, fone, None, prec),
C.NegativeOne : lambda x, prec, options: (fnone, None, prec, None),
C.exp : lambda x, prec, options: evalf_pow(C.Pow(S.Exp1, x.args[0],
evaluate=False), prec, options),
C.cos : evalf_trig,
C.sin : evalf_trig,
C.Add : evalf_add,
C.Mul : evalf_mul,
C.Pow : evalf_pow,
C.log : evalf_log,
C.atan : evalf_atan,
C.abs : evalf_abs,
C.re : evalf_re,
C.im : evalf_im,
C.floor : evalf_floor,
C.ceiling : evalf_ceiling,
C.Integral : evalf_integral,
C.Sum : evalf_sum,
C.Piecewise : evalf_piecewise,
C.bernoulli : evalf_bernoulli,
}