Display the source code in std/math/exponential.d from which this page was generated on github.

If you spot a problem with this page, click here to create a Bugzilla issue.

Quickly fork, edit online, and submit a pull request for this page. Requires a signed-in GitHub account. This works well for small changes. If you'd like to make larger changes you may want to consider using local clone.

Function `std.math.exponential.log`

Calculate the natural logarithm of x.


						
				real log
				(
				

				  real x
				

				) pure nothrow @nogc @safe;

Special Values
x	log(x)	divide by 0?	invalid?
±0.0	-∞	yes	no
<0.0	NAN	no	yes
+∞	+∞	no	no

Example

import std.math.operations : feqrel;
import std.math.constants : E;

assert(feqrel(log(E), 1) >= real.mant_dig - 1);

Authors

Walter Bright, Don Clugston, Conversion of CEPHES math library to D by Iain Buclaw and David Nadlinger

License

Boost License 1.0.