Aaron,
I store charge as TMatrix in a root file. And it works.
Cheers, Vitaliy
Taylan Akdogan wrote:
> Hi Aaron,
>
> I can tell why it does not work (and a possible work-around.)
>
> Float_t is a typedef (for float), not an object. So, "charge->" is
> illegal because it is simply "(float)->"
>
> The only work around I know (it is ugly!) is like this:
>
> class Test : public TObject {public:double charge;};
> Test t;
> t.charge = 1.3;
> t.Write();
>
> Maybe, you can consider to include everything (TH1F, Float_t...)
> related to a "quantity" into an object, and write that single object
> into TFile.
>
> Taylan
>
> --
> ---=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=---
> Taylan Akdogan Massachusetts Institute of Technology
> akdogan@mit.edu Department of Physics
> Phn:+1-617-258-0801 Laboratory for Nuclear Science
> Fax:+1-617-258-5440 Room 26-402b
> ---=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=---
> On Sep 21, 2004, at 5:28 PM, Aaron Joseph Maschinot wrote:
>
>>
>> in addition to storing a histogram in a root file, i would like to also
>> store the charge for the histogram also in the root file. the charge
>> would simply be a Float_t or Double_t. however, since neither or these
>> are explicitly root classes, they do not have a Write() function and
>> thus
>> can't be written to file per norm:
>>
>> {
>> TH1F *hist;
>> Float_t charge;
>>
>> f=new TFile("crap.root","recreate");
>>
>> hist->Write(); //good!
>> charge->Write(); //hogwash! (that's the kentucky in me coming out
>> :^) )
>>
>> f->Close();
>> }
>>
>> does anyone know how to write Float_t's, Int_t's, etc. to root
>> files? i'm
>> sure it's a simple answer that i'm just not thinking about...
>>
>> aaron
>
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