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https://issues.apache.org/jira/browse/HAMA-151?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12673123#action_12673123
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Edward J. Yoon commented on HAMA-151:
-------------------------------------
Sangwon Seo, Thanks for your review.
Could you give me more comments?
> Add multiplication example of file matrices
> -------------------------------------------
>
> Key: HAMA-151
> URL: https://issues.apache.org/jira/browse/HAMA-151
> Project: Hama
> Issue Type: New Feature
> Components: documentation , examples
> Affects Versions: 0.1.0
> Reporter: Edward J. Yoon
> Assignee: Edward J. Yoon
> Fix For: 0.1.0
>
> Attachments: HAMA-151.patch
>
>
> Using CollectBlocksMap (See also HAMA-150), We can collect the blocks to
> 'collectionTable' from HDFS files as describe below.
> It would be nice if it added up the examples.
> -----
> public static class MyMapper extends CollectBlocksBase implements
> CollectBlocksMap<IntWritable, MapWritable> {
> private MapWritable value;
> @Override
> public void map(IntWritable key, MapWritable value,
> OutputCollector<BlockID, VectorWritable> output, Reporter reporter)
> throws IOException {
> int startColumn;
> int endColumn;
> int blkRow = key.get() / mBlockRowSize;
> this.value = value;
> int i = 0;
> do {
> startColumn = i * mBlockColSize;
> endColumn = startColumn + mBlockColSize - 1;
> if (endColumn >= mColumns) // the last sub vector
> endColumn = mColumns - 1;
> output.collect(new BlockID(blkRow, i), new VectorWritable(key.get(),
> subVector(startColumn, endColumn)));
> i++;
> } while (endColumn < (mColumns - 1));
> }
> private DenseVector subVector(int i0, int i1) {
> DenseVector res = new DenseVector();
> for (int i = i0; i <= i1; i++) {
> res.set(i, ((DoubleWritable) this.value.get(new
> IntWritable(i))).get());
> }
> return res;
> }
> }
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