[Dune] [#909] Method 'infinity_norm' does not actually compute the infinity norm

[Dune]

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User who did this - Oliver Sander (sander) 

Attached to Project - Dune
Summary - Method 'infinity_norm' does not actually compute the infinity norm
Task Type - Bug Report
Category - Common
Status - New
Assigned To - 
Operating System - Unspecified / All
Severity - Low
Priority - Normal
Reported Version - SVN (pre2.2)
Due in Version - Undecided
Due Date - Undecided
Details - I would expect a method called 'infinity_norm' of a matrix to compute the infinity norm: the maximum of the absolute values of all entries.  However at least the implementations in DenseMatrix, BCRSMatrix, and Matrix compute something else, namely the maximum over the 1-norms of the matrix rows.  This is a flagrant violation of the principle of least surprise.

The fix is easy, however apparently the behavior is intentional.  At least it is mentioned in the documentation.  Why would I need such a strange norm?  And isn't there a better name for it?

More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=909

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