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{{alias}}( x )
Evaluates the natural logarithm of `1+x`.
For `x < -1`, the function returns `NaN`, as the natural logarithm is not
defined for negative numbers.
Parameters
----------
x: number
Input value.
Returns
-------
y: number
Function value.
Examples
--------
> var y = {{alias}}( 4.0 )
~1.609
> y = {{alias}}( -1.0 )
-Infinity
> y = {{alias}}( 0.0 )
0.0
> y = {{alias}}( -0.0 )
-0.0
> y = {{alias}}( -2.0 )
NaN
> y = {{alias}}( NaN )
NaN
See Also
--------
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