transforms.py 文件源码

def _compute_transform(self, F, s, x, **hints):
        from sympy import postorder_traversal
        global _allowed
        if _allowed is None:
            from sympy import (
                exp, gamma, sin, cos, tan, cot, cosh, sinh, tanh,
                coth, factorial, rf)
            _allowed = set(
                [exp, gamma, sin, cos, tan, cot, cosh, sinh, tanh, coth,
                 factorial, rf])
        for f in postorder_traversal(F):
            if f.is_Function and f.has(s) and f.func not in _allowed:
                raise IntegralTransformError('Inverse Mellin', F,
                                     'Component %s not recognised.' % f)
        strip = self.fundamental_strip
        return _inverse_mellin_transform(F, s, x, strip, **hints)