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# numpy.isfinite() in Python

• Last Updated : 23 Oct, 2020

The numpy.isfinite() function tests element-wise whether it is finite or not(not infinity or not Not a Number) and return the result as a boolean array.
Syntax :

`numpy.isfinite(array [, out])`

Parameters :

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```array : [array_like]Input array or object whose elements,
we need to test for infinity
out   : [ndarray, optional]Output array placed with result.
Its type is preserved and it must be of the right
shape to hold the output.
```

Return :

```boolean array containing the result
```

Code 1 :

 `# Python Program illustrating``# numpy.isfinite() method``  ` `import` `numpy as geek `` ` `print``(``"Finite : "``, geek.isfinite(``1``), ``"\n"``)`` ` `print``(``"Finite : "``, geek.isfinite(``0``), ``"\n"``)`` ` `# not a number``print``(``"Finite : "``, geek.isfinite(geek.nan), ``"\n"``)`` ` `#  infinity``print``(``"Finite : "``, geek.isfinite(geek.inf), ``"\n"``)`` ` `print``(``"Finite : "``, geek.isfinite(geek.NINF), ``"\n"``)  `

Output :

```Finite :  True

Finite :  True

Finite :  False

Finite :  False

Finite :  False

```

Code 2 :

 `# Python Program illustrating``# numpy.isfinite() method``   ` `import` `numpy as geek ``  ` `# Returns True/False value for each element ``b ``=` `geek.arange(``20``).reshape(``5``, ``4``)``                ` `print``(``"\n"``,b)``print``(``"\nIs Finite : \n"``, geek.isfinite(b))`` ` ` ` `b ``=` `[[``1j``], ``     ``[geek.inf]]``print``(``"\nIs Finite : \n"``, geek.isfinite(b))`

Output :

``` [[ 0  1  2  3]
[ 4  5  6  7]
[ 8  9 10 11]
[12 13 14 15]
[16 17 18 19]]

Is Finite :
[[ True  True  True  True]
[ True  True  True  True]
[ True  True  True  True]
[ True  True  True  True]
[ True  True  True  True]]

Is Finite :
[[ True]
[False]]```

Note :
These codes won’t run on online-ID. Please run them on your systems to explore the working.
.
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