Java Decimal Format getStandardDeviationString(double[] standardDeviationDoubles)

Description

get Standard Deviation String

License

Apache License

Declaration

public static String getStandardDeviationString(double[] standardDeviationDoubles) 

Method Source Code

//package com.java2s;
/*// w w  w.jav a2s.c  o  m
 * Copyright 2015 Red Hat, Inc. and/or its affiliates.
 *
 * 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.
 */

import java.text.DecimalFormat;

public class Main {
    public static String getStandardDeviationString(double[] standardDeviationDoubles) {
        if (standardDeviationDoubles == null) {
            return null;
        }
        StringBuilder standardDeviationString = new StringBuilder(standardDeviationDoubles.length * 9);
        // Abbreviate to 2 decimals
        // We don't use a local sensitive DecimalFormat, because other Scores don't use it either (see PLANNER-169)
        DecimalFormat exponentialFormat = new DecimalFormat("0.0#E0");
        DecimalFormat decimalFormat = new DecimalFormat("0.0#");
        boolean first = true;
        for (double standardDeviationDouble : standardDeviationDoubles) {
            if (first) {
                first = false;
            } else {
                standardDeviationString.append("/");
            }
            // See http://docs.oracle.com/javase/7/docs/api/java/lang/Double.html#toString%28double%29
            String abbreviated;
            if (0.001 <= standardDeviationDouble && standardDeviationDouble <= 10000000.0) {
                abbreviated = decimalFormat.format(standardDeviationDouble);
            } else {
                abbreviated = exponentialFormat.format(standardDeviationDouble);
            }
            standardDeviationString.append(abbreviated);
        }
        return standardDeviationString.toString();
    }
}

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