Hi Eddi, > Hi Victor, > In your answer you mention dealing with sparse matrices. > Is there in the current TMatrix support for that ? No, not yet. I was talking about possible future. Victor Eddy Offermann wrote: > > ------------- Begin Forwarded Message ------------- > > Hi Victor, > In your answer you mention dealing with sparse matrices. > Is there in the current TMatrix support for that ? > > Eddy > > Hi Nicolas, > > > I dont think that providing overloading of > > Double_t& operator[](Int_t i) > > and > > Double_t operator[](Int_t i) const > > yes, you are right. I have misunderstand you. > I thought that you want pointer to array. > But functions above do not violate encapsulation. > There could be some complications for sparced matricies, > number of words is less than N*M , but it is solvable. > > Victor > > Nicolas Produit wrote: > > > > Hi Victor, > > > > > to provide such method you will broke encapsulation. Your code > > > must not be dependent of matrix implementation inside a class. > > > Let say, TMatrix will be improved and sparce matrices will be > > > added. > > > Then your method becomes unavailable, what leads to vialation > > > of encapsulation. > > > > I dont think that providing overloading of > > Double_t& operator[](Int_t i) > > and > > Double_t operator[](Int_t i) const > > > > on TMatrix to fetch or store a value in a 2 D matrix > > at place (i/fCols,i%fCols) > > would break encapsulation. > > > > I agree that method GetfElement is, it is why I prefer []. > > > > For Eddy, > > > > thanks a lot for the suggestion. But I think your suggestion > > is actually a fancy way of doing a copy to TArray, I would rather > > have a solution not involving copying. > > Anyway I can perhaps use your trick in some case. > > > > -- > > Nicolas Produit > > INTEGRAL Science Data Center Phone: +41 22 950 91 40 > > 16, Chemin d'Ecogia Fax: +41 22 950 91 33 > > CH-1290 Versoix www: http://isdc.unige.ch/ > > -- > Victor M. Perevoztchikov perev@bnl.gov perev@vxcern.cern.ch > Brookhaven National Laboratory MS 510A PO Box 5000 Upton NY 11973-5000 > tel office : 631-344-7894; fax 631-344-4206; home 631-345-2690 > > ------------- End Forwarded Message ------------- > > Eddy A.J.M. Offermann > Renaissance Technologies Corp. > 25 East Loop Rd. > Suite 211 > Stony Brook, NY 11790 > e-mail: eddy@rentec.com > phone: (516)246-5550 > fax: (516)246-5761 -- Victor M. Perevoztchikov perev@bnl.gov perev@vxcern.cern.ch Brookhaven National Laboratory MS 510A PO Box 5000 Upton NY 11973-5000 tel office : 631-344-7894; fax 631-344-4206; home 631-345-2690
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