PYTHON is_nan

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Python replacement for PHP's is_nan [ edit | history ]
import math
math.isnan(val) # Python 2.6+

PHP is_nan

PHP original manual for is_nan [ show | php.net ]

is_nan

(PHP 4 >= 4.2.0, PHP 5)

is_nanFinds whether a value is not a number

Description

bool is_nan ( float $val )

Checks whether val is 'not a number', like the result of acos(1.01).

Parameters

val

The value to check

Return Values

Returns TRUE if val is 'not a number', else FALSE.

Examples

Example #1 is_nan() example

<?php
// Invalid calculation, will return a 
// NaN value
$nan acos(8);

var_dump($nanis_nan($nan));
?>

The above example will output:

float(NAN)
bool(true)

See Also