Log 543 x 10 10 10735 The number has 3 significant figures but its log ends up with 5 significant figures since the mantissa has 3 and the characteristic has 2. Log 27 x 10-8 -757 The number has 2 significant figures but its log ends up with 3 significant figures. Below are some cases.
If the value of x is negative the return value is always NaN.
Lnx is undefined for x 0. Logarithms of negative numbers are not defined in the real numbers in the same way that square roots of negative numbers arent defined in the real numbers. In mathematics the logarithm is the inverse function to exponentiationThat means the logarithm of a given number x is the exponent to which another fixed number the base b must be raised to produce that number xIn the simplest case the logarithm counts the number of occurrences of the same factor in repeated multiplication. The following example uses Log to evaluate certain logarithmic identities for selected values.