Revision as of 23:53, 20 September 2009

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.

Math functions

Ln(1) → 0

Ln(2) → 0.6931471805599453

Ln(2.718) → 0.999896315728952

Ln(1/2.718) → -0.999896315728952

Ln(0) &rarr -INF

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

@@ Line 17: / Line 17: @@
 :Ln(2) &rarr; 0.6931471805599453
 :Ln(2.718) &rarr; 0.999896315728952
+:Ln(1/2.718) &rarr; -0.999896315728952
 :Ln(0) &rarr -[[INF]]
 :Ln(-1) &rarr [[NaN]]   { With Warning: Logarithm of a non-positive number }