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From "Hugo Ferrira (JIRA)" <>
Subject [jira] [Created] (MATH-1046) math3.stat.Frequency: Allow Null keys (comparable objects)
Date Thu, 24 Oct 2013 11:00:02 GMT
Hugo Ferrira created MATH-1046:

             Summary: math3.stat.Frequency: Allow Null keys (comparable objects)
                 Key: MATH-1046
             Project: Commons Math
          Issue Type: Improvement
    Affects Versions: 3.2
         Environment: Linux, JDK 7
            Reporter: Hugo Ferrira
            Priority: Trivial

The class {{math3.stat.Frequency}} uses a {{TreeMap}} which does not allow
for the use of null keys ({{public void addValue(Comparable<?> v)}} with {{v = null}}).
I am analyzing data (matrix) whose values may 
contain nulls. I need to get the counts for elements in a given column.
This includes knowing how many are null. This information will be used
for data cleaning/pre-processing.

 A simple change would be substituting {{TreeMap}} with {{java.util.HashMap<K,V>}}.

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