[jira] [Created] (MAHOUT-1301) toString() method of SequentialAccessSparseVector has excess comma at the end

["Alexander Senov (JIRA)" <ji...@apache.org>]

Alexander Senov created MAHOUT-1301:
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             Summary: toString() method of SequentialAccessSparseVector has excess comma at the end
                 Key: MAHOUT-1301
                 URL: https://issues.apache.org/jira/browse/MAHOUT-1301
             Project: Mahout
          Issue Type: Bug
          Components: Math
    Affects Versions: 0.8
            Reporter: Alexander Senov
            Priority: Trivial


Realization of SequentialAccessSparseVector toString() method had changed in MAHOUT-1259 patch. Unfortunately, that patch introduced new bug: output of the toString() method had been changed - extra comma added at the end of the string

Example: 
Consider following sparse vector
{code:java}
Vector v = new SequentialAccessSparseVector(capacity);
v.set(1, 0.1);
v.set(3, 0.3);
{code}
In 0.7 v.toString() returns following string:
{code:java}
{1:0.1,3:0.3}
{code}
but in 0.8 it returns
{code:java}
{1:0.1,3:0.3,}
{code}
As you can see, there is extra comma at the end of the string.

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