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Date: Thu, 8 Mar 2012 06:21:03 +0000 (UTC)
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Subject: [jira] [Updated] (MATH-765) Refactoring the vector and matrix
 classes
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     [ https://issues.apache.org/jira/browse/MATH-765?page=3Dcom.atlassian.=
jira.plugin.system.issuetabpanels:all-tabpanel ]

S=C3=A9bastien Brisard updated MATH-765:
-----------------------------------

    Comment: was deleted

(was: Since inner product should be implemented , shouldnt a user be able t=
o change a matrix representation in a given base ? . Something along the li=
nes of :

RealMatrix changeBase( RealMatrix newBase )

Ohhh .. btw , calculating a Matrix's trace could prove usefull too ...

double trace() or static double trace( RealMatrix m )
)
   =20
> Refactoring the vector and matrix classes
> -----------------------------------------
>
>                 Key: MATH-765
>                 URL: https://issues.apache.org/jira/browse/MATH-765
>             Project: Commons Math
>          Issue Type: Improvement
>    Affects Versions: 4.0
>            Reporter: S=C3=A9bastien Brisard
>              Labels: api-change, linear
>
> {panel:title=3DWarning|borderStyle=3Dsolid}
> This is not a bug report, but rather a summary of all discussions which h=
ave taken place on the mailing list regarding the refactoring of the vector=
 and matrix classes. Indeed, it has been argued many times that the {{RealV=
ector}} and {{RealMatrix}} interfaces are really cluttered, and could benef=
it from other approaches (like functional programming).=20
> The description of this ticket will be updated as the discussion progress=
es on the mailing-list, and new JIRA tickets will be created to carry out t=
he "real" work. In order to keep this ticket tidy, contributors should refr=
ain from commenting on this website. Instead, messages should be posted on =
the dev mailing-list.
> {panel}
> h1. The current API (version 3.0)
> In this section, the current interfaces for vectors and matrices are comp=
ared. Vectors and matrices are two mathematical objects which are very clos=
e in nature. Their implementations should therefore be as similar as possib=
le. The methods will be sorted as follows
> * methods reflecting the mathematical structure of vector space: addition=
, multiplication by a scalar, matrix-vector product, ...
> * methods reflecting the mathematical structure of euclidean space
> * ...
> h2. Methods reflecting the mathematical structure of vector space
> || {{RealVector}}                      || {{RealMatrix}}                 =
                          || Comments ||
> | {{RealVector add(RealVector v)}}     | {{RealMatrix add(RealMatrix m)}}=
                          |           |
> | {{int getDimension()}}               | {{int getRowDimension()}},\\ {{i=
nt getColumnDimension()}} |           |
> | {{RealVector mapMultiply(double d)}} | {{scalarMultiply(double d)}}    =
                          |           |
> |                                      | {{multiply(RealMatrix m)}}      =
                          |           |
> |                                      | {{double[] operate(double[])}}  =
                          |           |
> |                                      | {{RealVector operate(RealVector)=
}}                        |           |
> |                                      | {{double[] preMultiply(double[])=
}}                        |           |
> |                                      | {{RealMatrix preMultiply(RealMat=
rix)}}                    |           |
> |                                      | {{RealVector preMultiply(RealVec=
tor)}}                    |           |
> h2. Methods reflecting the mathematical structure of euclidean space

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