• Home
• it.unibo.tuprolog
• solve-jvm
• 0.12.0
• source code
• NaturalLogarithm.kt

×

Project download

Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance.
Project price only 1 $

You can buy this project and download/modify it how often you want.

commonMain.it.unibo.tuprolog.solve.stdlib.function.NaturalLogarithm.kt Maven / Gradle / Ivy

package it.unibo.tuprolog.solve.stdlib.function

import it.unibo.tuprolog.core.Integer
import it.unibo.tuprolog.core.Numeric
import it.unibo.tuprolog.core.Real
import it.unibo.tuprolog.solve.ExecutionContext
import it.unibo.tuprolog.solve.function.UnaryMathFunction
import org.gciatto.kt.math.BigDecimal
import kotlin.math.E
import kotlin.math.log

/**
 * Implementation of `log/1` arithmetic functor
 *
 * @author Enrico
 */
object NaturalLogarithm : UnaryMathFunction("log") {

    override fun mathFunction(integer: Integer, context: ExecutionContext): Numeric =
        commonBehaviour(integer.decimalValue)

    override fun mathFunction(real: Real, context: ExecutionContext): Numeric =
        commonBehaviour(real.value)

    /** Implementation of common behaviour for Integer and Real */
    private fun commonBehaviour(decimal: BigDecimal): Real =
        Numeric.of(log(decimal.toDouble(), E))
}