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Diffstat (limited to 'src/main/java/org/apache/commons/math3/analysis/function/Constant.java')
-rw-r--r-- | src/main/java/org/apache/commons/math3/analysis/function/Constant.java | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/src/main/java/org/apache/commons/math3/analysis/function/Constant.java b/src/main/java/org/apache/commons/math3/analysis/function/Constant.java new file mode 100644 index 0000000..4027e59 --- /dev/null +++ b/src/main/java/org/apache/commons/math3/analysis/function/Constant.java @@ -0,0 +1,60 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You 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 org.apache.commons.math3.analysis.function; + +import org.apache.commons.math3.analysis.DifferentiableUnivariateFunction; +import org.apache.commons.math3.analysis.differentiation.DerivativeStructure; +import org.apache.commons.math3.analysis.differentiation.UnivariateDifferentiableFunction; + +/** + * Constant function. + * + * @since 3.0 + */ +public class Constant implements UnivariateDifferentiableFunction, DifferentiableUnivariateFunction { + /** Constant. */ + private final double c; + + /** + * @param c Constant. + */ + public Constant(double c) { + this.c = c; + } + + /** {@inheritDoc} */ + public double value(double x) { + return c; + } + + /** {@inheritDoc} + * @deprecated as of 3.1, replaced by {@link #value(DerivativeStructure)} + */ + @Deprecated + public DifferentiableUnivariateFunction derivative() { + return new Constant(0); + } + + /** {@inheritDoc} + * @since 3.1 + */ + public DerivativeStructure value(final DerivativeStructure t) { + return new DerivativeStructure(t.getFreeParameters(), t.getOrder(), c); + } + +} |