Investment Studio > Expressions > Functions > Math & Trig > LOG

float log(float number, float base = 10)

Returns the logarithm of the number to the specified base.

The number must be positive. The base must be positive and <> 1.

If the base is omitted, it defaults to 10.

log(number, base) is the inverse of power(base, exponent) = base^exponent.

Examples

=log(10)

equals 1

=log(power(2, 7), 2)

equals 7

=power(2, log(7, 2))

equals 7.

See also exp, ln, log10, power.