Platform and version requirements: JVM (1.2), JS (1.2), Native (1.2)

fun log(x: Double, base: Double): Double

fun log(x: Float, base: Float): Float

Computes the logarithm of the value x to the given base.

Special cases:

• log(x, b) is NaN if either x or b are NaN
• log(x, b) is NaN when x < 0 or b <= 0 or b == 1.0
• log(+Inf, +Inf) is NaN
• log(+Inf, b) is +Inf for b > 1 and -Inf for b < 1
• log(0.0, b) is -Inf for b > 1 and +Inf for b > 1

See also logarithm functions for common fixed bases: ln, log10 and log2.