Check-in commons-math 3.6.1 am: 1354beaf45 am: 0018f64b87

Original change: https://android-review.googlesource.com/c/platform/external/apache-commons-math/+/2702413

Change-Id: Ic2a78fec4bb3bb3448de42350306644ba2bd021d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

1 files changed, 51 insertions, 0 deletions

diff --git a/src/main/java/org/apache/commons/math3/analysis/function/Cosh.java b/src/main/java/org/apache/commons/math3/analysis/function/Cosh.java
new file mode 100644
index 0000000..185698b
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+++ b/src/main/java/org/apache/commons/math3/analysis/function/Cosh.java
@@ -0,0 +1,51 @@
+/*
+ * 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;
+import org.apache.commons.math3.util.FastMath;
+
+/**
+ * Hyperbolic cosine function.
+ *
+ * @since 3.0
+ */
+public class Cosh implements UnivariateDifferentiableFunction, DifferentiableUnivariateFunction {
+    /** {@inheritDoc} */
+    public double value(double x) {
+        return FastMath.cosh(x);
+    }
+
+    /** {@inheritDoc}
+     * @deprecated as of 3.1, replaced by {@link #value(DerivativeStructure)}
+     */
+    @Deprecated
+    public DifferentiableUnivariateFunction derivative() {
+        return new Sinh();
+    }
+
+    /** {@inheritDoc}
+     * @since 3.1
+     */
+    public DerivativeStructure value(final DerivativeStructure t) {
+        return t.cosh();
+    }
+
+}