// Beginning of editable part
 int n;
 double y0;
 double dPrecision = 1e-6;
 y = E;
 
 
 
 
 do
 {
 n++;
 y0 = ( -(x/t)^a )^n /( gamma(1+a*n) );
 y = E*y0 + y ;
 
 }
 while((E*y0/y) > dPrecision);

quote:

---

I am not familiar with origin C, I need some help.

---

Worksheet wks("<worksheet_name>");
Dataset ds(wks, <col_nr>);
int ii;
ii=...;
ds[ii]=...;

quote:

---

What exactly is the problem?

---

void _nlsfMLsample(
// Fit Parameter(s):
double a, double t, double E,
// Independent Variable(s):
double x,
// Dependent Variable(s):
double& y)
{
	// Beginning of editable part
	int n;
	double y0;
	double dPrecision = 1e-6;
	y = E;
	
	do
	{
	n++;
	y0 = ( -(x/t)^a )^n /( gamma(1+a*n) );
	y = E*y0 + y ;
	}
	while((E*y0/y) > dPrecision);
	// End of editable part
}

quote:

---

Originally posted by aplotnikov

You can find the solution in my previous reply. Try to read it carefully once again. Or just wait for a reply from Originlab. I cannot help you anymore, sorry.

---

	Worksheet wks = Project.ActiveLayer();
	
	Dataset ds(wks,1);
	
	int ii;
	ii=0;
	A=ds[ii];
	y=A*x;//for example

Worksheet wks("<worksheet_name>");

Worksheet wks("<worksheet_Sheet1>");

Worksheet wks("<Sheet1>");