I do use it at one place, but that is a piece that needs overhaul
anyway, and after that, they are gone there also. My impression is that
you either want a double[][] array to dealw with, or a Matrix in itself.
Kim
Phil Steitz wrote:
Do you use the setXxx stuff anywhere or see any reason that we need to maintain it?
-----Original Message-----
From: Kim van der Linde [mailto:[EMAIL PROTECTED]
Sent: Mon 9/27/2004 11:21 AM
To: Jakarta Commons Developers List
Cc:
Subject: Re: [math] API changes for RC2
Phil Steitz wrote:
> "Spooky" -- delightful word choice ;-) The getDataRef method is
> there to limit copy operations and to support hacking the underlying
> array -- evil, hazardous, breaks encapsulation -- altogether
> "spooky"; but users may want this in some cases.
I do:
Matrix diffMatrix = new Matrix(cases, variables);
double diffArray[][] = diffMatrix.getDataRef();
double baseArray[][] = baseMatrix.getDataRef();
//verbose(true, "Robust baseMatrix\n"+baseMatrix.toSquareString());
for (int x = 0; x < cases; x++)
{
for (int y = 0; y < variables; y++)
{
diffArray[x][y] = baseArray[x][y] - robustMeans[y];
}
}
//verbose(true, "Robust diffArray\n"+diffMatrix.toSquareString());
robustDist = Distances.mahalanobis(diffMatrix, robustCovar);
det = Math.sqrt(robustCovar.getDeterminant());
Just an example.......
Kim
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