optaplanner-benchmark/src/main/java/org/optaplanner/benchmark/impl/statistic/StatisticUtils.java
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)
        DecimalFormatSymbols decimalFormatSymbols = new DecimalFormatSymbols(Locale.US);
        DecimalFormat exponentialFormat = new DecimalFormat("0.0#E0", decimalFormatSymbols);
        DecimalFormat decimalFormat = new DecimalFormat("0.0#", decimalFormatSymbols);
        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();
    }
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)
        DecimalFormatSymbols decimalFormatSymbols = new DecimalFormatSymbols(Locale.US);
        DecimalFormat exponentialFormat = new DecimalFormat("0.0#E0", decimalFormatSymbols);
        DecimalFormat decimalFormat = new DecimalFormat("0.0#", decimalFormatSymbols);
        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();
    }
TODO Do the locale formatting in benchmarkReport.html.ftl - https://issues.jboss.org/browse/PLANNER-169