How can I execute a macro that calls a function?

From: Jayoung Wu (jayoung@glue.umd.edu)
Date: Thu Mar 05 1998 - 20:01:56 MET 

Hi,
I tried to execute a macro("ytrack.C") that calls a function("sfit") but
it gives the following error message.

To execute a macro("ytrack.C"), I typed
        root [0] .x ytrack.C

Is there something wrong with handling pointers in my function "sfit"?
In the sense of C it should be no problem.
  
Or is there something wrong with handling function inside ROOT
interpreter? My function "sfit" does not return any value. It assigns a
value on variable that is in "ytrack.C" using pointer.
                                        ^^^^^^^^^^^^^^
Stand alone version of "ytrack.C" had no problem.

======================== Error message ==============================
@ Error: Illegal pointer operation (bstore:3) FILE:ytrack.C LINE:10
@ Error: Illegal pointer operation (bstore:3) FILE:ytrack.C LINE:10
* Error: Illegal pointer operation (bstore:3) FILE:ytrack.C LINE:11
@ Error: Illegal pointer operation (bstore:3) FILE:ytrack.C LINE:11
@ Error: Illegal pointer operation (bstore:3) FILE:ytrack.C LINE:11
@ Error: Illegal pointer operation (bstore:3) FILE:ytrack.C LINE:11
Error: Illegal pointer operation (tovalue) FILE:ytrack.C LINE:11
* Error: Illegal pointer operation (bstore:3) FILE:ytrack.C LINE:12
@ Error: Illegal pointer operation (bstore:3) FILE:ytrack.C LINE:12
@ Error: Illegal pointer operation (bstore:3) FILE:ytrack.C LINE:12
Error: Illegal pointer operation (tovalue) FILE:ytrack.C LINE:12
* Error: Illegal pointer operation (bstore:3) FILE:ytrack.C LINE:13
@ Error: Illegal pointer operation (bstore:3) FILE:ytrack.C LINE:13
@ Error: Illegal pointer operation (bstore:3) FILE:ytrack.C LINE:13
Error: Illegal pointer operation (tovalue) FILE:ytrack.C LINE:13
* Error: Illegal pointer operation (bstore:3) FILE:ytrack.C LINE:14
@ Error: Illegal pointer operation (bstore:3) FILE:ytrack.C LINE:14
@ Error: Illegal pointer operation (bstore:3) FILE:ytrack.C LINE:14
@ Error: Illegal pointer operation (bstore:3) FILE:ytrack.C LINE:14
Error: Illegal pointer operation (tovalue) FILE:ytrack.C LINE:14
@ Error: Illegal pointer operation (bstore:3) FILE:ytrack.C LINE:9
@ Error: Illegal pointer operation (bstore:3) FILE:ytrack.C LINE:9
@ Error: Illegal pointer operation (bstore:3) FILE:ytrack.C LINE:9
@ Error: Illegal pointer operation (bstore:3) FILE:ytrack.C LINE:9
@ Error: Illegal pointer operation (bstore:3) FILE:ytrack.C LINE:9
@ Error: Illegal pointer operation (bstore:3) FILE:ytrack.C LINE:9
@ Error: Illegal pointer operation (bstore:3) FILE:ytrack.C LINE:9
@ Error: Illegal pointer operation (bstore:3) FILE:ytrack.C LINE:9

================================ "ytrack.C" is ================
// function declaration
void sfit(Int_t n,Float_t *x,Float_t *y,Float_t *w,Float_t *pb0,Float_t 
*pb1);

// function definition
void sfit(Int_t n,Float_t *x,Float_t *y,Float_t *w,Float_t *pb0,Float_t
*pb1)
{

  Float_t  tt1,tt2,tt3,tt4,tt5,ss;

  tt1 = tt2 = tt3 = tt4 = tt5 = 0.;

  for (Int_t i=0; i<n; i++) {
    tt1 = tt1 + 1 * *(w+i) * *(w+i);
    tt2 = tt2 + *(x+i) * *(x+i) * *(w+i) * *(w+i);
    tt3 = tt3 + *(x+i) * *(w+i) * *(w+i);
    tt4 = tt4 + *(y+i) * *(w+i) * *(w+i);
    tt5 = tt5 + *(y+i) * *(x+i) * *(w+i) * *(w+i);
  }

  ss = tt1*tt2 - tt3*tt3;

  if (ss == 0) {
    *pb0 = -999;
    *pb1 = -999;
  }
  else {
    *pb0 = (tt2*tt4 - tt5*tt3)/ss;
    *pb1 = (tt1*tt5 - tt3*tt4)/ss;
  }
}

// main function
void ytrack()
{
  Int_t    noy;


  Float_t  szzy[5];
  Float_t  sypos[5];
  Float_t  syesum[5];
  Float_t  silyin;
  Float_t  b0,b1;

 	... processing data & assign values on noy,szzy,sypos,syesum 
 
	//call function "sfit"
	sfit(noy,szzy,sypos,syesum,&b0,&b1);

	silyin = b0 + b1*46.764;
	printf("%g\n",silyin);

}
==========================================================================

---
Thanks a lot!
Jayoung Wu

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