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https://issues.apache.org/jira/browse/HAMA-80?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12638959#action_12638959
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Samuel Guo commented on HAMA-80:
--------------------------------
Why we need m & n both?
In linear algebra, the identity matrix or unit matrix of size n is the n-by-n
square matrix with ones on the main diagonal and zeros elsewhere.
And I don't think it's good to store an identity matrix as DenseMatrix. It may
not efficient.
Maybe we can create another class, sth like:
class IdentityMatrix implements Matrix {
....
public double get(int i, int j) throws IOException {
return (i==j)?1:0;
}
....
}
it is not neccessary to store the matrix in hbase.
> Add identity(int m, int n) which returns an m-by-n matrix with ones on the
> diagonal and zeros elsewhere.
> --------------------------------------------------------------------------------------------------------
>
> Key: HAMA-80
> URL: https://issues.apache.org/jira/browse/HAMA-80
> Project: Hama
> Issue Type: New Feature
> Components: implementation
> Reporter: Edward J. Yoon
> Assignee: Edward J. Yoon
> Priority: Minor
> Fix For: 0.1.0
>
> Attachments: HAMA-80.patch
>
>
> double[][] X;
> for (int i = 0; i < m; i++) {
> for (int j = 0; j < n; j++) {
> X[i][j] = (i == j ? 1.0 : 0.0);
> }
> }
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