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PHP log1p () function

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Examples

Return a different number of log (1 + number):

<?php
echo(log1p(2.7183) . "<br>");
echo(log1p(2) . "<br>");
echo(log1p(1) . "<br>");
echo(log1p(0));
?>

Running instance »

Definition and Usage

log1p () function returns log (1 + number), even when the value of number is close to zero can also calculate the exact results.


grammar

log1p( number );

参数 描述
number 必需。规定要处理的数。

technical details

return value: log (1 + number)
Return type: Float
PHP version: 4.1+
PHP Update Log: PHP 5.3: log1p () function is available on all platforms.


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