[jira] Updated: (MAHOUT-187) RandomUtils>>isNotPrime throws IllegalArgumentException when argument is less than 2.

["Sean Owen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAHOUT-187?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Owen updated MAHOUT-187:
-----------------------------

         Due Date: 16/Oct/09
    Fix Version/s: 0.2
         Assignee: Sean Owen

Oh heh I see this was already changed, by me, in SVN. It will go out with 0.2.

> RandomUtils>>isNotPrime throws IllegalArgumentException when argument is less than 2.
> -------------------------------------------------------------------------------------
>
>                 Key: MAHOUT-187
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-187
>             Project: Mahout
>          Issue Type: Bug
>    Affects Versions: 0.1
>            Reporter: Emerson Murphy-HIll
>            Assignee: Sean Owen
>             Fix For: 0.2
>
>
> I was using a FastMap, which happened to be empty, and rehash() was called.  Rehash eventually calls isNotPrime where n=1, which throws an illegal argument exception:
>   public static boolean isNotPrime(int n) {
>     if (n < 2) {
>       throw new IllegalArgumentException();
>     }
> It seems to me anything less than two is not prime.  Thus, I suggest:
>   public static boolean isNotPrime(int n) {
>     if (n < 2) {
>     	return true;
>     }

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