# numpy.isfinite() in Python

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 :

```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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