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isfinite#

ivy.isfinite(x, /, *, out=None)[source]#

Test each element x_i of the input array x to determine if finite (i.e., not NaN and not equal to positive or negative infinity).

Parameters:

  • x (Union[Array, NativeArray]) – input array. Should have a numeric data type.

  • out (Optional[Array], default: None) – optional output array, for writing the result to. It must have a shape that the inputs broadcast to.

Return type:

Array

Returns:

ret – an array containing test results. An element out_i is True if x_i is finite and False otherwise. The returned array must have a data type of bool.

Special Cases

For real-valued floating-point operands,

  • If x_i is either +infinity or -infinity, the result is False.

  • if x_i is NaN, the result is False.

  • if x_i is a finite number, the result is True.

For complex floating-point operands, let a = real(x_i), b = imag(x_i), and

  • If a is NaN or b is NaN, the result is False.

_ If a is either +infinity or -infinity and b is any value,

the result is False.

  • If a is any value and b is either +infinity or -infinity, the result is False.

  • If a is a finite number and b is a finite number, the result is True.

This method conforms to the `Array API Standard<https://data-apis.org/array-api/latest/>`_. This docstring is an extension of the docstring <https://data-apis.org/array-api/latest/ API_specification/generated/array_api.isfinite.html> _ in the standard.

Both the description and the type hints above assumes an array input for simplicity, but this function is nestable, and therefore also accepts ivy.Container instances in place of any of the arguments.

Examples

With ivy.Array input:

>>> x = ivy.array([0, ivy.nan, -ivy.inf, float('inf')])
>>> y = ivy.isfinite(x)
>>> print(y)
ivy.array([ True, False, False, False])

>>> x = ivy.array([0, ivy.nan, -ivy.inf])
>>> y = ivy.zeros(3)
>>> ivy.isfinite(x, out=y)
>>> print(y)
ivy.array([1., 0., 0.])

>>> x = ivy.array([[9, float('-0')], [ivy.nan, ivy.inf]])
>>> ivy.isfinite(x, out=x)
>>> print(x)
ivy.array([[1., 1.],
       [0., 0.]])

With ivy.Container input:

>>> x = ivy.Container(a=ivy.array([0., 999999999999]),
...                   b=ivy.array([float('-0'), ivy.nan]))
>>> y = ivy.isfinite(x)
>>> print(y)
{
    a: ivy.array([True, True]),
    b: ivy.array([True, False])
}
Array.isfinite(self, *, out=None)[source]#

ivy.Array instance method variant of ivy.isfinite. This method simply wraps the function, and so the docstring for ivy.isfinite also applies to this method with minimal changes.

Parameters:

  • self (Array) – input array. Should have a real-valued data type.

  • out (Optional[Array], default: None) – optional output array, for writing the result to. It must have a shape that the inputs broadcast to.

Return type:

Array

Returns:

ret – an array containing test results. An element out_i is True if self_i is finite and False otherwise. The returned array must have a data type of bool.

Examples

>>> x = ivy.array([0, ivy.nan, -ivy.inf, float('inf')])
>>> y = x.isfinite()
>>> print(y)
ivy.array([ True, False, False, False])
Container.isfinite(self, *, key_chains=None, to_apply=True, prune_unapplied=False, map_sequences=False, out=None)[source]#

ivy.Container instance method variant of ivy.isfinite. This method simply wraps the function, and so the docstring for ivy.isfinite also applies to this method with minimal changes.

Parameters:

  • self (Container) – input container. Should have a real-valued data type.

  • key_chains (Optional[Union[List[str], Dict[str, str], Container]], default: None) – The key-chains to apply or not apply the method to. Default is None.

  • to_apply (Union[bool, Container], default: True) – If True, the method will be applied to key_chains, otherwise key_chains will be skipped. Default is True.

  • prune_unapplied (Union[bool, Container], default: False) – Whether to prune key_chains for which the function was not applied. Default is False.

  • map_sequences (Union[bool, Container], default: False) – Whether to also map method to sequences (lists, tuples). Default is False.

  • out (Optional[Container], default: None) – optional output container, for writing the result to. It must have a shape that the inputs broadcast to.

Return type:

Container

Returns:

ret – a container containing the test result. An element out_i is True if self_i is finite and False otherwise. The returned array must have a data type of bool.

Examples

>>> x = ivy.Container(a=ivy.array([0., 999999999999]),
...                   b=ivy.array([float('-0'), ivy.nan]))
>>> y = x.isfinite()
>>> print(y)
{
    a: ivy.array([True, True]),
    b: ivy.array([True, False])
}
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