kotlin-stdlib/kotlin.math/log

log

expect fun log(x: Double, base: Double): Double(source)
expect fun log(x: Float, base: Float): Float(source)

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.

Since Kotlin

1.2
actual fun log(x: Double, base: Double): Double(source)
actual inline fun log(x: Float, base: Float): Float(source)

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.

Since Kotlin

1.2
actual fun log(x: Double, base: Double): Double(source)
actual fun log(x: Float, base: Float): Float(source)

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.

Since Kotlin

1.2
actual fun log(x: Double, base: Double): Double(source)
actual fun log(x: Float, base: Float): Float(source)

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.

Since Kotlin

1.3
actual fun log(x: Double, base: Double): Double(source)
actual fun log(x: Float, base: Float): Float(source)

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.

Since Kotlin

1.8
actual fun log(x: Double, base: Double): Double(source)
actual fun log(x: Float, base: Float): Float(source)

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.

Since Kotlin

1.8