[Dune] [#397] Preconditioner< X, Y >::apply documentation-implementation discrepancy

Dune dune at dune-project.org
Tue May 20 12:14:53 CEST 2008


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A new Flyspray task has been opened.  Details are below. 

User who did this - Uli Sack (usack) 

Attached to Project - Dune
Summary - Preconditioner< X, Y >::apply  documentation-implementation discrepancy
Task Type - Bug Report
Category - ISTL
Status - Unconfirmed
Assigned To - 
Operating System - Linux
Severity - Medium
Priority - Normal
Reported Version - SVN
Due in Version - Undecided
Due Date - Undecided
Details - The documentation of

Dune::Preconditioner< X, Y >::apply (X& v, const Y&d) 	

specifies that on exit v=M^{-1}d. This, however, is not implemented as such - at least in the Jacobi Preconditioner SeqJac. If v already contains old data it is not overwritten but used in the dbjac method.

I would therefore suggest either adjusting documentation or setting v=0.0; in the beginning of apply(v,d) to match the documentation/specification.

More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=397

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