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Posted to dev@hama.apache.org by "Edward J. Yoon (JIRA)" <ji...@apache.org> on 2009/10/21 07:13:59 UTC
[jira] Updated: (HAMA-190) Bug in Matrix-Vector multiplication
[ https://issues.apache.org/jira/browse/HAMA-190?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Edward J. Yoon updated HAMA-190:
--------------------------------
Resolution: Fixed
Status: Resolved (was: Patch Available)
It was committed.
> Bug in Matrix-Vector multiplication
> -----------------------------------
>
> Key: HAMA-190
> URL: https://issues.apache.org/jira/browse/HAMA-190
> Project: Hama
> Issue Type: Bug
> Components: matrix
> Affects Versions: 0.1.0
> Reporter: Edward J. Yoon
> Assignee: Edward J. Yoon
> Fix For: 0.1.0
>
> Attachments: HAMA-190.patch
>
>
> Hi again,
> Since I've more complex operations, (such as multiply, inverse, load...) I decided coding instead of use the shell.
> I've wrote simple example to multiple 2 matrixes, and got incorrect results, can you let me know if I've some mistake, or it's well known bug.
> A = 1,2
> 3,4
> B = 1
> 2
> The result should be (C = A * B):
> C = 5
> 11
> But I got incorrect results from the example below:
> 1.0,2.0
> 3.0,6.0
> The code:
> public static void main(String[] args) throws IOException {
> conf.set("hbase.rootdir", "hdfs://lb-emu-2:54310/hbase");
> conf.set("hbase.master", "lb-emu-2:60000");
> conf.set("mapred.jar", "/app/installs/hama/hama-0.1.0-dev.jar");
> DenseMatrix a = new DenseMatrix(conf, "A", true);
> a.setDimension(2, 2);
> a.set(0, 0, 1);
> a.set(0, 1, 2);
> a.set(1, 0, 3);
> a.set(1, 1, 4);
> DenseMatrix b = new DenseMatrix(conf, "B", true);
> b.setDimension(2, 1);
> b.set(0, 0, 1);
> b.set(0, 1, 2);
> DenseMatrix c = a.mult(b);
> for (int i = 0; i < c.getRows(); i++) {
> for (int j = 0; j < c.getColumns(); j++) {
> System.out.print(c.get(i, j) + " ");
> }
> System.out.println("");
> }
> }
> Thanks again,
> Nir.
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