[ROOT] Problem with code including TMatrixRow

From: Perfetto Francesco (Francesco.Perfetto@na.infn.it)
Date: Tue Dec 17 2002 - 10:44:44 MET


Hi All,

I have a problem with following code:

{
#include "TMatrix.h"
#include "TVector.h"


TMatrix combi(15,6);
TVector indice(6);

Int_t ii=1;
for (Int_t jj=2; jj<7; jj++)
  {
    Int_t kk=2;
    Int_t ll=2;
    Int_t mm=2;
    Int_t nn=2;
    Int_t pippo=1;

    if( (kk) != (jj) )  //<<<------- this is the problem
      {
	indice(0)=ii;
	indice(1)=jj;
	indice(2)=kk;
	indice(3)=ll;
	indice(4)=mm;
	indice(5)=nn;

	indice.Print();

	TMatrixRow(combi,0)=indice;  // this is line 29

	combi.Print();
	pippo = 0;
      }
    else
      kk=kk+1;

  }

}

If kk is greater than the starting jj (i.e. 2 in the example), the program
runs. If I set kk=2 the program won't run. The output is the following:

Error: improper lvalue FILE:prova3.C LINE:29
*** Interpreter error recovered ***

It seems that if the conditions is satisfied at least once then everything
is fine. If it's false on the first loop iteration the program exit.

Thank for your help
  Francesco



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