babintsev@mx.ihep.su, 21-FEB-2001
Hello rooters,
I cannot compile the script (below), where is my error ?
root [0] .L test1.C++
....
invalid use of undefined type `class TF1'
....
//..................test...............
#include <stdlib.h>
#include <stdio.h>
#include <iostream.h>
class TF1;
Double_t fitf(Double_t *x, Double_t *par);
Double_t fitf(Double_t *x, Double_t *par)
{
Double_t arg = 0;
cout<<"par0= "<<par[0]<<"par1= "<<par[1]<<"par2= "<<par[2]<< "x0 = "<<
x[0] << endl;
// if (par[2]) arg = (x[0] - par[1])/par[2];
Float_t pp= par[2]; if (pp) arg = (x[0] - par[1])/par[2];
Double_t fitval = par[0]*TMath::Exp(-0.5*arg*arg);
return fitval;
}
void test()
{
TF1 *fun = new TF1("fit",fitf,-3,3,3);
fun->SetParameters(500,0.,1.0);
fun->SetParNames("Constant","Mean_value","Sigma");
fun->Draw();
}
//....................
Volodja Babintsev
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