def erfc(x):
    x = float(x)
    if x != x:
        return x
    if x < 0.0:
        if x < -6.0:
            return 2.0
        return 2.0-erfc(-x)
    if x > 9.0:
        return _erfc_asymp(x)
    if x >= 1.0:
        return _erfc_mid(x)
    return 1.0 - _erf_taylor(x)
Inserts a value at a specified index in the list.
dataset/ETHPy150Open fredrik-johansson/mpmath/mpmath/math2.py/erfc--crossover with--dataset/ETHPy150Open enthought/traitsui/traitsui/editors/table_editor.py/ReversedList.insert