Manuals/calci/LN

LN(n)

• where $n$ is the positive real number.

Description

• This function gives the Natural Logarithm of a number.
• $LN$ is the logarithm in which the base is the irrational number $e$ ($e$= 2.71828...).
• For example, Failed to parse (unknown function "\appro"): {\displaystyle ln_10 = loge_10 = \appro 2.30258}
• Also called Napierian logarithm.
• The constant $e$ is called Euler's number.
• The Natural Logarithm is denoted by $ln(x)$ or $loge(x)$.
• where $x$ is the Positive real number.
• The ln(x) is the inverse function of the exponential function e^ln(x)=x if x>0.

ln(e^x)=x

Examples

• =LN(15) = 2.708050201
• =LN(8.3) = 2.116255515
• =LN(1) = 0
• =LN(0) = INFINITY
• =LN(-20) = NAN
• =LN(exp(5)) = 5
• =EXP(LN(7)) = 7

See Also

• LOG
• EXP
• IML

References

Natural Logarithm