Hi Henrique,
At least one advantage of deriving from a common base class TObject.
You can do
Histo_List[0])->Draw();
Rene Brun
On Fri, 29 Nov 2002, Henrique de M. J. Barbosa - mestrado wrote:
>
> Pasha,
>
> Thanks a lot for the advice, now it works. One more question: do you know
> if it is possible to get the entries from a TObjArray with the proper
> type?
>
> I mean, in my case they are all TH1D* histograms, but when I do:
>
> Histo_List[0]
>
> I get a TObject* and not a TH1D*. Then, for instance, if I want to plot
> one of the histograms I have to use:
>
> ((TH1D*) Histo_List[0])->Draw()
>
> to convert the "output" to the correct type and then draw it. It is
> possible to do it some other way?
>
> Thanks a lot,
>
> Henrique
> ****************************************
> State University at Campinas - BRASIL
> "Gleb Wathagin" Physics Institute
> Department of Cosmic Rays and Chronology
>
> Henrique Barbosa The Pierre Auger
> PhD Student Observatory
> ****************************************
>
>
> > Hi Henrique, you can use TObjArray of histograms. -best, Pasha
> >
> > "Henrique de M. J. Barbosa - mestrado" wrote:
> > >
> > > Dear Root Masters,
> > >
> > > I have the following problem: I want to build an array of histograms and
> > > use this array as a parameter of a function. Well, if I fix the size of
> > > the array before passing it to the function:
> > >
> > > void main(void) {
> > > TH1F **histo; // I know this can be done
> > > histo = malloc(sizeof(TH1F*)*Size); // just by TH1F *histo[Size]
> > >
> > > my_fill(histo);
> > > }
> > >
> > > my_fill(TH1F** htemp) {
> > > for (int i=0; i<Size; i++)
> > > htemp = new TH1F();
> > > }
> > >
> > > Then it works perfectly. But my problem is that I want my subroutine to
> > > allocate the memory because only within the subroutine I will know what
> > > "Size" show be.
> > >
> > > I tried to do the following:
> > >
> > > void main(void) {
> > > TH1F **histo;
> > >
> > > my_fill(histo);
> > > }
> > >
> > > my_fill(TH1F** htemp) {
> > > htemp = malloc(sizeof(TH1F*)*Size);
> > > for (int i=0; i<Size; i++)
> > > htemp = new TH1F();
> > > }
> > >
> > > But it doesn't work. Any tips of how to do this? I have tried to do
> > > some simple tests and I found out that the root behaviour is diferent from
> > > the standard c++, maybe this is the problem, I don't know:
> > >
> > > root [0] double x = 3
> > > root [1] &x
> > > Error: reference type x with no initialization FILE:/tmp/fileVv6eIH_cint LINE:1
> > > Error: x already declared as different type FILE:/tmp/fileVv6eIH_cint LINE:1
> > > *** Interpreter error recovered ***
> > > root [2]
> > >
> > > Shouldn't I've got the address of "x" in the code above?
> > >
> > > []'s
> > >
> > > Henrique
> > > ****************************************
> > > State University at Campinas - BRASIL
> > > "Gleb Wathagin" Physics Institute
> > > Department of Cosmic Rays and Chronology
> > >
> > > Henrique Barbosa The Pierre Auger
> > > PhD Student Observatory
> > > ****************************************
> >
>
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