[ROOT] Symbol nan is not found in current scope

From: Venkatesh Kaushik (venkat@hepmail.uta.edu)
Date: Mon Aug 11 2003 - 19:42:35 MEST 

Hi folks,

I get the following error..

Error: Symbol nan is not defined in current scope  FILE:EPTPC_mod.C LINE:120
*** Interpreter error recovered ***

The code is given below..
   .....
   auto_ptr<ofstream> out( new ofstream(op_file));

   ...
   ...
      // Define TGraph to fit a line thro data..

      TGraphErrors *Line = new 
TGraphErrors(nlines,Rad,Ephi,Err_rad,Err_phi);
       Line->Fit("pol1","Ql","ep"); 
       pol1->GetParameters(parm);  
       perr[0] = pol1->GetParError(0);
       perr[1] = pol1->GetParError(1);
       
       cal_eta = parm[0] + parm[1] * 1693.09;

       // Some formatting for output
       out->setf(ios::scientific,ios::floatfield);
       out->setf(ios::showpos);
       out->precision(4);
       out->width(18);
      
      *out << perr[0] + perr[1] << endl;  <------------------------ This 
is where it is bombing..

Can anybody help? I guess there must be some function in the math 
library to check not-a-number .. like IsNaN() or something..
       
 Venkat

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