# scipy.special.erfcinv

scipy.special.erfcinv(x, /, out=None, *, where=True, casting='same_kind', order='K', dtype=None, subok=True[, signature, extobj]) = <ufunc 'erfcinv'>

  Inverse of the complementary error function.

  > Computes the inverse of the complementary error function.

  > In the complex domain, there is no unique complex number w satisfying erfc(w)=z. This indicates a true inverse function would have multi-value. When the domain restricts to the real, 0 < x < 2, there is a unique real number satisfying erfc(erfcinv(x)) = erfcinv(erfc(x)).

  > It is related to inverse of the error function by erfcinv(1-x) = erfinv(x)

  Parameters
    y ndarray

      Argument at which to evaluate. Domain: [0, 2]

  Returns
    erfcinv ndarray

      The inverse of erfc of y, element-wise

  See also

  `erf`

    Error function of a complex argument

  `erfc`

    Complementary error function, `1 - erf(x)`

  `erfinv`

    Inverse of the error function

  Examples

  1. evaluating a float number

      >>> from scipy import special
      >>> special.erfcinv(0.5)
      0.4769362762044698

  2. evaluating an ndarray

      >>> from scipy import special
      >>> y = np.linspace(0.0, 2.0, num=11)
      >>> special.erfcinv(y)
      array([        inf,  0.9061938 ,  0.59511608,  0.37080716,  0.17914345,
             -0.        , -0.17914345, -0.37080716, -0.59511608, -0.9061938 ,
                    -inf])

scipy.special.erfinv scipy.special.wofz