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 (= 2.71828 . . . ).
• For example, ln 10 = loge10 = approximately 2.30258.
• Also called Napierian logarithm.
• The constant e is called Euler's number.
• The natural logarithm is denoted by ln(x) or log e(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