A function giving the natural logarithm of its argument.
This function gives the logarithm to the base 'e' of its argument. The 'natural' number, 'e', is approximately 2.71828183.
Logarithms are 'traditionally' used for multiplication (by adding the logarithms) and division (by subtracting the logarithms). For example,
10 log1=LN(2.5) 20 log2=LN(2) 30 log3=log1+log2 40 answer=EXP(log3) 50 PRINT answer
will calculate 2.5*2 by adding their natural logarithms and print the answer.