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All Samples(6)  |  Call(3)  |  Derive(0)  |  Import(3)
Computes the inverse error function, satisfying

.. math ::

    \mathrm{erf}(\mathrm{erfinv}(x)) =
    \mathrm{erfinv}(\mathrm{erf}(x)) = x.

This function is defined only for `-1 \le x \le 1`.

**Examples**(more...)

src/s/y/sympy-HEAD/sympy/statistics/distributions.py   sympy(Download)
        # computed numerically
 
        from sympy.mpmath import mpf, erfinv
 
        # calculate y = ierf(p) by solving erf(y) - p = 0
        y = erfinv(mpf(p))

src/s/y/sympy-polys-HEAD/sympy/statistics/distributions.py   sympy-polys(Download)
        # computed numerically
 
        from sympy.mpmath import mpf, erfinv
 
        # calculate y = ierf(p) by solving erf(y) - p = 0
        y = erfinv(mpf(p))

src/s/y/sympy-0.7.5/sympy/statistics/distributions.py   sympy(Download)
        # computed numerically
 
        from sympy.mpmath import mpf, erfinv
 
        # calculate y = ierf(p) by solving erf(y) - p = 0
        y = erfinv(mpf(p))