The other thought is that the NaturalComparator is not added to default TreeMap when its created.
Frequency.NaturalComparator http://jakarta.apache.org/commons/math/xref/org/apache/commons/math/stat/Frequency.html#401
public int compare(Object o1, Object o2) {
return ((Comparable)o1).compareTo(o2);
}
Shing Hing Man wrote:
Deal all,
It would be appreciated if someone could clarify
the following on org.apache.commons.math.stat.univariate.Frequency.
My version of org.apache.commons.math is dated 10
August, 2004.
The following snippet piece of code is from
http://jakarta.apache.org/commons/math/userguide/stat.html#1.3%20Frequency%20distributions
Frequency f = new Frequency();
f.addValue(1);
f.addValue(new Integer(1)); // (*)
f.addValue(new Long(1));
f.addValue(2);
f.addValue(new Integer(-1));
System.out.println(f.getCount(1)); //
displays 3
System.out.println(f.getCumPct(0)); //
displays 0.2
System.out.println(f.getPct(new Integer(1))); // displays 0.6
System.out.println(f.getCumPct(-2)); //
displays 0
System.out.println(f.getCumPct(10)); //
displays 1
When I run it, I got the following exception at line (*).
Exception in thread "main" java.lang.IllegalArgumentException: Value not comparable to existing values.
It looks as though the default comparator can not compare primitive type int with Integer object. I thought this piece of code is supposed to demonstrate the otherwise.
Thanks in advice for your help !
Shing
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