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From "Max Heimel (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAHOUT-435) Add assign(DenseVector)/assign(DenseMatrix) function to DenseVector/DenseMatrix
Date Tue, 06 Jul 2010 16:32:54 GMT

     [ https://issues.apache.org/jira/browse/MAHOUT-435?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Max Heimel updated MAHOUT-435:
------------------------------

    Status: Patch Available  (was: Open)

> Add assign(DenseVector)/assign(DenseMatrix) function to DenseVector/DenseMatrix
> -------------------------------------------------------------------------------
>
>                 Key: MAHOUT-435
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-435
>             Project: Mahout
>          Issue Type: New Feature
>          Components: Math
>            Reporter: Max Heimel
>            Priority: Minor
>         Attachments: MAHOUT-435.diff
>
>
> This new feature would add a new overloaded assign function to (Dense)Vector/(Dense)Matrix,
that allows to assign the content of another (Dense)Vector / (Dense)Matrix by overwriting
the content of the internal double array. Compared to using .clone(), this feature would reduce
the number of memory allocations. 
> For example in case of an iterative algorithm, that needs to check for convergence;
> {code:title=Convergence check using .clone()|borderStyle=solid}
> Densematrix newMatrix = oldMatrix.clone();
> while(!converged)
> {
>     // perform iteration computation on newMatrix
>     converged=checkConvergence(newMatrix,oldMatrix);
>     oldMatrix = newMatrix.clone(); // results in memory allocation
> }
> {code}
> {code:title=Convergence check using .assign(Matrix)|borderStyle=solid}
> Densematrix newMatrix = oldMatrix.clone();
> while(!converged)
> {
>     // perform iteration computation on newMatrix
>     converged=checkConvergence(newMatrix,oldMatrix);
>     oldMatrix.assign(newMatrix); // no memory allocation
> }
> {code}

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