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 letting a constrained parameter vary		  New Topic  Reply to Topic
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hauli

Austria
Posts
Posted - 03/23/2006 :  08:44:10 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version (Select Help-->About Origin): 7.5
Operating System: windows XP

Hi,

I am using the NLSF to fit my data to the function
y=100/(1+10^(((logECF-(1/p)*log10(F/(100-F)))-x)*p))
the parameters to fit are logECF and p

F is not really a parameter but should be constrained to values from 5 to 95 (step 5)

so what I want is to do a fit with F set fixed to 5, followed by a fit with F set to 10 and so on. For each fit the parameters worksheet should be stored

I want to perform the calculations programatically with Origin C, but I am new to programming, so please provide me some code or information on how to do it.

Thanks in advance

Hauli

greg

USA
1379 Posts
Posted - 03/23/2006 :  11:38:39 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Here is a LabTalk script which performs sequential fits of the active plotted dataset using the ExpDec1 function with specific values of the P1 parameter.

for(val=-20;val<=-10;val+=1) {
nlsf.init();
nlsf.begin();
nlsf.func$=ExpDec1;
nlsf.p1 = val;
nlsf.p2 = 20;
nlsf.p3 = 500;
nlsf.v1 = 0; // don't allow this parameter to vary
nlsf.fitData$=%C;
nlsf.iterate(100);
nlsf.xmode=0;
nlsf.end();
}

Once you have defined your function, the above could be easily adapted to OriginC.
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