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https://issues.apache.org/jira/browse/MAHOUT-531?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alexander Hans updated MAHOUT-531:
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Status: Patch Available (was: Open)
This patch enables MatrixWritable to write/read all types of currently
implemented matrices except VectorList and MatrixView. Write/read of column/row
labels is supported as well. In order to support sparse matrices, the following
changes were made:
- add isDense() to Matrix interface and all implementations
- add getNumActuallySet() (returns the number of values actually stored in
memory)
- add iterate() (iterates over the number of items from the previous point
using Matrix.Element)
Included is a test as well. Since both VectorWritableTest and
MatrixWritableTest can share code, a abstract class WritableTestCase was
introduced.
MatrixWritable knows if the given Matrix is writable by first calling
getNumActuallySet(). This fails with an UnsupportedOperationException for
implementations that aren't writable.
> MatrixWritable doesn't actually write/read anything
> ---------------------------------------------------
>
> Key: MAHOUT-531
> URL: https://issues.apache.org/jira/browse/MAHOUT-531
> Project: Mahout
> Issue Type: Bug
> Components: Math
> Reporter: Alexander Hans
>
> The write() and readFields() methods of MatrixWritable write/read only the
> classname, they don't write/read actual data.
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