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https://issues.apache.org/jira/browse/MATH-1046?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hugo Ferrira closed MATH-1046.
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Resolution: Not A Problem
Fix Version/s: 3.2
We can circumvent the issue with a wrapper class.
See last comment.
> math3.stat.Frequency: Allow Null keys (comparable objects)
> ----------------------------------------------------------
>
> Key: MATH-1046
> URL: https://issues.apache.org/jira/browse/MATH-1046
> Project: Commons Math
> Issue Type: Improvement
> Affects Versions: 3.2
> Environment: Linux, JDK 7
> Reporter: Hugo Ferrira
> Priority: Trivial
> Labels: features
> Fix For: 3.2
>
>
> 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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