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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


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

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


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


Boost License 1.0.