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Function `std.math.exponential.log`

Calculate the natural logarithm of x.


						
				real log
				(
				

				  real x
				

				) pure nothrow @nogc @safe;
				

				

				double log
				(
				

				  double x
				

				) pure nothrow @nogc @safe;
				

				

				float log
				(
				

				  float 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.