Re: [ROOT] Writing Matrix to TTree

From: Alessio Sarti (Alessio.Sarti@lnf.infn.it)
Date: Fri Apr 30 2004 - 14:48:09 MEST


HI Rene,
thanks for the answer.
I'm having problems finding out in test/Event.h how to write an fMatrix
object to a tree.
There's no implementation of
  dataTree->Branch("fMatrix",     fMatrix, "fMatrix[io][in]/D");
in the code in test/* files.

I've tried my own  
dataTree->Branch("adcM",     adcM, "adcM[nCadc][nadc]/D");

but the code crashes:

 *** Break *** segmentation violation
 Generating stack trace...
/usr/bin/c++filt: unknown demangling style `gnu-new-abi'

running the debugger I got:

[Switching to Thread 1093052608 (LWP 12945)]
0x400e6e86 in TBuffer::WriteFastArray(double const*, int) ()
   from /home/Packages/Packages/root/lib/libCore.so
(gdb) where
#0  0x400e6e86 in TBuffer::WriteFastArray(double const*, int) ()
   from /home/Packages/Packages/root/lib/libCore.so
#1  0x40c77fd6 in TLeafD::FillBasket(TBuffer&) () from
/home/Packages/Packages/root/lib/libTree.so
#2  0x40c6284b in TBranch::FillLeaves(TBuffer&) () from
/home/Packages/Packages/root/lib/libTree.so
#3  0x40c62579 in TBranch::Fill() () from
/home/Packages/Packages/root/lib/libTree.so
#4  0x40c827a1 in TTree::Fill() () from
/home/Packages/Packages/root/lib/libTree.so
#5  0x41185c48 in UnMapASCII::UnMapFile() (this=0xbfec54a0) at
UnMapASCII.cc:77
#6  0x08048c6d in main (argc=2, argv=0xbfffe564) at EfficiencyTest.cc:22
#7  0x42015704 in __libc_start_main () from /lib/tls/libc.so.6

Do you have any Idea of what is the problem?

Cheers,
alessio

______________________________________________________
Alessio Sarti     INFN Frascati

>>>I'm in Frascati<<<

Cell   +39-06-94038166
Office +39-06-94032776
Fax    +39-06-94032427

"... e a un Dio 'fatti il culo' non credere mai..."
(F. De Andre')

"He was turning over in his mind an intresting new concept in
Thau-dimensional physics which unified time, space, magnetism, gravity
and, for some reason, broccoli".  (T. Pratchett: "Pyramids")



On Fri, 30 Apr 2004, Rene Brun wrote:

> Hi Alessio,
> 
> Yes, this is possible. See example in $ROOTSYS/test/Event.h
> 
> Rene Brun
> 
> Alessio Sarti wrote:
> > 
> > Hi all,
> > I'm trying to understand if it is possible, in root, to write a matrix to
> > a Tree.
> > Let's say: I have a matrix filled per event and I'd like to have it dumped
> > in the Tree via the Fill method.
> > This is because the matrix has lots of variables that have similar meaning
> > and having them packed up in a per event matrix would save a lot of
> > variables copy-paste and would enlarge the flexibility of the code.
> > So, instead of
> > 
> > Int_t ADC1[100];
> > Int_t ADC2[100];
> > ..............
> > Int_t ADC100[100];
> > 
> > I'd like to have
> > Int_t ADC[100][100];
> > 
> > Is that possible?
> > thanks,
> > alessio
> > 
> > ______________________________________________________
> > Alessio Sarti     INFN Frascati
> > 
> > >>>I'm in Frascati<<<
> > 
> > Cell   +39-06-94038166
> > Office +39-06-94032776
> > Fax    +39-06-94032427
> > 
> > "... e a un Dio 'fatti il culo' non credere mai..."
> > (F. De Andre')
> > 
> > "He was turning over in his mind an intresting new concept in
> > Thau-dimensional physics which unified time, space, magnetism, gravity
> > and, for some reason, broccoli".  (T. Pratchett: "Pyramids")
> 



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