Ln(x)

The natural logarithm of «x». This is the value y such that e^y=Exp(y)=x, where e2.718281828459045 is Euler's number.

«x» must be non-negative or a warning will be issued. If the warning is ignored, or Show Result Warnings is off, the result is NaN.

Library

Math functions

Ln(1) → 0

Ln(2) → 0.6931471805599453

Ln(2.718) → 0.999896315728952

Ln(0) &rarr -Inf

Ln(-1) &rarr NaN { With Warning: Logarithm of a non-positive number }