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.

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