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 Non-linear regression on sum
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MantaManni

Germany
9 Posts

Posted - 08/29/2020 :  06:11:38 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
OriginPro 2020 (64-bit) SR1
9.7.0.188 (Academic)

Hello together, I am trying to write a script in Origin C to perform non-linear regression analysis on this formula




This is what I got so far:

//
void _nlsfdiffusionsumresistance(
// Fit Parameter(s):
double Aeq, double D, double H,
// Independent Variable(s):
double x,
// Dependent Variable(s):
double& y)
{
const double n=50;
const double l=0.001;
// Beginning of editable part
double bb=0;
double R=l*H/D;

for(int ii =1; ii<=n; ii++);
if(R=ii*tan(ii)); while (ii>0)
{
bb = (2*R^2/ii^2*(ii^2+R^2+R))*exp(ii^2*D*x/l);
}

y = (1-bb)*Aeq;
// End of editable part

I am not very used to programming, so if someone could help, that would be awesome!

Thank you in advance

Edited by - MantaManni on 08/29/2020 06:57:03 AM

lkb0221

China
497 Posts

Posted - 09/02/2020 :  10:58:18 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Not really sure what do you mean in your for-if-while part.
Maybe you can send some details to their tech support <tech@originlab.com> asking for advanced help.
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