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(Updated 2011-12-17 20:50:42.776447) Review request for mahout, Ted Dunning, lancenorskog, and Dmitriy Lyubimov. Changes ------- Correct version. Summary ------- Here's a patch with a simple job to calculate the row mean (column-wise mean). One outstanding issue is the combiner, this requires a wrtiable class IntVectorTupleWritable, where the Int stores the number of rows, and the Vector stores the column-wise sum. This addresses bug MAHOUT-923. https://issues.apache.org/jira/browse/MAHOUT-923 Diffs (updated) ----- /trunk/core/src/main/java/org/apache/mahout/math/hadoop/DistributedRowMatrix.java 1215567 /trunk/core/src/main/java/org/apache/mahout/math/hadoop/MatrixColumnMeansJob.java PRE-CREATION /trunk/core/src/test/java/org/apache/mahout/math/hadoop/TestDistributedRowMatrix.java 1215567 Diff: https://reviews.apache.org/r/3147/diff Testing ------- Junit test Thanks, Raphael