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gamma.scala
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gamma.scala
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/*
* 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))