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Commons Math example source code file (NaNStrategy.java)

This example Commons Math source code file (NaNStrategy.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Math tags/keywords

fixed, fixed, maximal, minimal, minimal, nanstrategy, nanstrategy, removed, removed

The Commons Math NaNStrategy.java source code

/*
 * 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.math.stat.ranking;

/**
 * Strategies for handling NaN values in rank transformations.
 * <ul>
 * <li>MINIMAL - NaNs are treated as minimal in the ordering, equivalent to
 * (that is, tied with) <code>Double.NEGATIVE_INFINITY.
 * <li>MAXIMAL - NaNs are treated as maximal in the ordering, equivalent to
 * <code>Double.POSITIVE_INFINITY
 * <li>REMOVED - NaNs are removed before the rank transform is applied
 * <li>FIXED - NaNs are left "in place," that is the rank transformation is
 * applied to the other elements in the input array, but the NaN elements
 * are returned unchanged.</li>
 * </ul>
 *
 * @since 2.0
 * @version $Revision: 811685 $ $Date: 2009-09-05 13:36:48 -0400 (Sat, 05 Sep 2009) $
 */
public enum NaNStrategy {

    /** NaNs are considered minimal in the ordering */
    MINIMAL,

    /** NaNs are considered maximal in the ordering */
    MAXIMAL,

    /** NaNs are removed before computing ranks */
    REMOVED,

    /** NaNs are left in place */
    FIXED
}

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