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• gamma.scala

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schrodinger.math.special.gamma.scala Maven / Gradle / Ivy

/*
 * Copyright 2021 Arman Bilge
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package schrodinger.math
package special

import org.apache.commons.numbers.gamma.LogBeta
import org.apache.commons.numbers.gamma.LogGamma

def logGamma(x: Double): Double = LogGamma.value(x)
def gamma(x: Double): LogDouble = LogDouble.exp(logGamma(x))

def beta(p: Double, q: Double): LogDouble = LogDouble.exp(LogBeta.value(p, q))