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Add convenience method for initialization #153

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Add convenience method for initialization #153

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20 changes: 20 additions & 0 deletions src/main/java/org/apache/commons/math4/stat/descriptive/SummaryStatistics.java
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Original file line number Diff line number Diff line change
Expand Up @@ -132,6 +132,26 @@ public SummaryStatistics(SummaryStatistics original) throws NullArgumentExceptio
copy(original, this);
}

/**
* Construct a SummaryStatistics instance filling it with the given initialDoubleArray
* @param initialDoubleArray values for filling the array
*/
public SummaryStatistics(double[] initialDoubleArray) {
for (double initialValue : initialDoubleArray) {
addValue(initialValue);
}
}

/**
* Construct a SummaryStatistics instance filling it with the given initialDoubleArray
* @param initialDoubleArray values for filling the array
*/
public SummaryStatistics(Double[] initialDoubleArray) {
for (Double initialValue : initialDoubleArray) {
addValue(initialValue);
}
}

/**
* Return a {@link StatisticalSummaryValues} instance reporting current
* statistics.
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3 changes: 3 additions & 0 deletions src/test/java/org/apache/commons/math4/stat/descriptive/SummaryStatisticsTest.java
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Expand Up @@ -315,6 +315,9 @@ public void testQuadraticMean() {
expected = Math.sqrt(expected);

Assert.assertEquals(expected, stats.getQuadraticMean(), Math.ulp(expected));

SummaryStatistics convenienceMethodStatistics = new SummaryStatistics(values);
Assert.assertEquals(expected, convenienceMethodStatistics.getQuadraticMean(), Math.ulp(expected));
}

/**
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