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https://issues.apache.org/jira/browse/MAHOUT-1508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13967494#comment-13967494
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Hudson commented on MAHOUT-1508:
--------------------------------
SUCCESS: Integrated in Mahout-Quality #2563 (See
[https://builds.apache.org/job/Mahout-Quality/2563/])
MAHOUT-1508: Performance problems with sparse matrices (ssc: rev 1586851)
* /mahout/trunk/CHANGELOG
* /mahout/trunk/core/src/main/java/org/apache/mahout/math/MatrixWritable.java
*
/mahout/trunk/core/src/test/java/org/apache/mahout/math/MatrixWritableTest.java
*
/mahout/trunk/math/src/main/java/org/apache/mahout/math/RandomAccessSparseVector.java
*
/mahout/trunk/math/src/main/java/org/apache/mahout/math/SequentialAccessSparseVector.java
* /mahout/trunk/math/src/main/java/org/apache/mahout/math/SparseMatrix.java
* /mahout/trunk/math/src/test/java/org/apache/mahout/math/TestSparseMatrix.java
> Performance problems with sparse matrices
> -----------------------------------------
>
> Key: MAHOUT-1508
> URL: https://issues.apache.org/jira/browse/MAHOUT-1508
> Project: Mahout
> Issue Type: Bug
> Components: Math
> Reporter: Sebastian Schelter
> Assignee: Sebastian Schelter
> Priority: Blocker
> Fix For: 1.0
>
>
> I'm currently working with the new Scala DSL and running into a problem with
> SparseMatrix and SparseRowMatrix.
> The problem is that they don't implement a specialized assign(Matrix other,
> DoubleDoubleFunction f) function, but use the implementation from
> AbstractMatrix which loops through all (!) possible entries.
> We have to fix this asap.
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