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From "Hugo Ferrira (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MATH-1046) math3.stat.Frequency: Allow Null keys (comparable objects)
Date Thu, 24 Oct 2013 12:05:01 GMT

     [ https://issues.apache.org/jira/browse/MATH-1046?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Hugo Ferrira updated MATH-1046:
-------------------------------

    Labels: features  (was: easyfix)

> 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
>
> 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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