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Posted to commits@sis.apache.org by "Martin Desruisseaux (JIRA)" <ji...@apache.org> on 2016/05/17 21:42:13 UTC

[jira] [Closed] (SIS-176) Provide an optimized MathTransform implementation for diagonal matrices

     [ https://issues.apache.org/jira/browse/SIS-176?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Martin Desruisseaux closed SIS-176.
-----------------------------------

> Provide an optimized MathTransform implementation for diagonal matrices
> -----------------------------------------------------------------------
>
>                 Key: SIS-176
>                 URL: https://issues.apache.org/jira/browse/SIS-176
>             Project: Spatial Information Systems
>          Issue Type: Improvement
>          Components: Referencing
>    Affects Versions: 0.6
>            Reporter: Martin Desruisseaux
>            Assignee: Martin Desruisseaux
>            Priority: Minor
>             Fix For: 0.7
>
>
> {{ProjectiveTransform}} handles arbitrary matrices in a generic way. However in practice, many matrices are diagonal + a translation transform. We may get some performance improvement if we write a specialized transform class for such matrices, because it would replace a O(_n_²) operation by a O(_n_) one (_n_ is the matrix size).



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