add a double[][] solve(double[][]) method to Decompositionsolver
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Key: MATH-564
URL: https://issues.apache.org/jira/browse/MATH-564
Project: Commons Math
Issue Type: Improvement
Affects Versions: 2.2
Reporter: Luc Maisonobe
Assignee: Luc Maisonobe
Priority: Trivial
Fix For: 3.0
The decomposition solver provides both RealVector and double[] types for vector
solving, but it provides only RealMatrix type for matriw solving.
This breaks symmetry and is inconvenient in some algorithms which perform lots
of iterations. Lots of copying occurs while converting back and forth between
RealMatrix and arrays, with no value added when the matrix aspect of the data
is only used in the solve operation.
Adding a double[][] counterpart to RealMatrix in decomposition is also trivial
as internally the various implementations already use that.
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