Hi
The problem is not with the histograms, but they are deleted at the Begin
function. I solved the problem including an explicit initialization on the
Begin function also. Just the Int_t nevt = 0; didn't work, so I included a
nevt = 0 (and the other variables also). I guessed that since they are
global variables, they are not re-initialized on the second call, but the
explicit statement really set them to zero.
Thanks.
Luiz
Rene Brun wrote:
> Hi Luiz,
>
> It looks like you do not delete your histograms between the two passes.
> I suggest you read our standard example $ROOTSYS/tutorials/h1analysis.C,
> see function Begin).
>
> The message "Streamer not declared" is just an informative message
> in case the ClassDef macro is not found when processing a class.
> You can ignore this message. We will print this message in a future
> version only when the errorlevel will be greater than 0.
>
> Rene Brun
>
> On Sat, 27 Oct 2001, Luiz Martins Mundim Filho wrote:
>
> > Hello
> >
> > I'm using the file generated by MakeSelector to process an ntuple e get
> > number of expected events, cross sections, etc... I was using the
> > interpreted mode, but since my ntuple is very big, is got too slow and
> > I decided to invest some effort to compile it, but now I realized that
> > when executing it for the second time, it didn't initialized the
> > variables I use to count selected events in several channel. In summary,
> > I gave the commands (after reading the ntuple, compiling some auxiliary
> > routines and all that):
> >
> > root> h1->Process("Wpolarization.C++")
> > Creating shared library /home/delphi/data/ww/dat/./Wpolarization_C.so
> > Class Wpolarization: Streamer() not declared
> > Class Wpolarization: ShowMembers() not declared
> > Starting Wpolarization with process option:
> >
> > The number I got are correct. Then I did it again:
> >
> > root>h1->Process("Wpolarization.C+")
> >
> > The numbers are twice the correct ones. I used only one "+" because I
> > didn't modified the Wpolarization.C. Should I always use the double "+"
> > even if the analisys program has not changed?
> >
> > Another question: How can I solve the problem about the message about
> > Streamer() not declared. I have looked for an include file when it is
> > declared but I did not succeed.
> >
> > Thanks a lot.
> >
> > Luiz.
> >
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