MathUtil { public static int countNonZeroBeginning(final double... data) { int i = data.length - 1; while (i >= 0) { if (data[i--] != 0) { break; } } return i + 2; } private  MathUtil(); static double sum(final List<? extends Number> list); static double median(final Collection<Double> list); static double median(final double... list); static DescriptiveStatistics getStatistics(final Collection<Double> list); static DescriptiveStatistics getStatistics(final double... list); static double mean(final List<Double> list); static double variance(final List<Double> list); static double stDev(final List<Double> list); static double mad(final double... data); static double iqr(final double... data); static int countNonZeroBeginning(final double... data); static double[] getLoessParameterEstimates(final double... y); static SimpleRegression createLinearRegression(final double[] x, final double[] y); static OLSMultipleLinearRegression createLinearRegression(final double[][] x, final double[] y); static double[] getRobustLoessParameterEstimates(final double... y); static double[] getTricubeWeights(final int weightsNumber); static double[] getTricubeBisquareWeights(final double... residuals); static double[] abs(final double... data); static int doubleToInt(final double value); static int parseInt(final String value, final int defaultValue); static boolean same(final double first, final double second); static boolean same(final double first, final double second, final double precisionError); static List<Double> correlationCoefficients(final double[][] data); static final double HUNDRED_PERCENT; }
@Test public void testCountNonZeroBeginning() { assertEquals(NON_ZERO, MathUtil.countNonZeroBeginning(DATA4)); }