# scipy.special.seterr

scipy.special.seterr()

  Set how special-function errors are handled.

  Parameters:
    all{‘ignore’, ‘warn’ ‘raise’}, optional

      Set treatment for all type of special-function errors at once. The options are:

      - ‘ignore’ Take no action when the error occurs

      - ‘warn’ Print a `SpecialFunctionWarning` when the error occurs (via the Python `warnings` module)

      - ‘raise’ Raise a `SpecialFunctionError` when the error occurs.

      The default is to not change the current behavior. If behaviors for additional categories of special-function errors are specified, then `all` is applied first, followed by the additional categories.

    singular{‘ignore’, ‘warn’, ‘raise’}, optional

      Treatment for singularities.

    underflow{‘ignore’, ‘warn’, ‘raise’}, optional

      Treatment for underflow.

    overflow{‘ignore’, ‘warn’, ‘raise’}, optional

      Treatment for overflow.

    slow{‘ignore’, ‘warn’, ‘raise’}, optional

      Treatment for slow convergence.

    loss{‘ignore’, ‘warn’, ‘raise’}, optional

      Treatment for loss of accuracy.

    no_result{‘ignore’, ‘warn’, ‘raise’}, optional

      Treatment for failing to find a result.

    domain{‘ignore’, ‘warn’, ‘raise’}, optional

      Treatment for an invalid argument to a function.

    arg{‘ignore’, ‘warn’, ‘raise’}, optional

      Treatment for an invalid parameter to a function.

    other{‘ignore’, ‘warn’, ‘raise’}, optional

      Treatment for an unknown error.

  Returns:
    olderr dict

      Dictionary containing the old settings.

  See also

  `geterr`

    get the current way of handling special-function errors

  `errstate`

    context manager for special-function error handling

  `numpy.seterr`

    similar numpy function for floating-point errors

  Examples

      >>> import scipy.special as sc
      >>> from pytest import raises
      >>> sc.gammaln(0)
      inf
      >>> olderr = sc.seterr(singular='raise')
      >>> with raises(sc.SpecialFunctionError):
      ...     sc.gammaln(0)
      ...
      >>> _ = sc.seterr(**olderr)

  We can also raise for every category except one.

      >>> olderr = sc.seterr(all='raise', singular='ignore')
      >>> sc.gammaln(0)
      inf
      >>> with raises(sc.SpecialFunctionError):
      ...     sc.spence(-1)
      ...
      >>> _ = sc.seterr(**olderr)