| T O P I C R E V I E W |
| 5*10 |
Posted - 09/21/2005 : 08:46:09 AM
Origin Version (Select Help-->About Origin): 7G SR4 v.7.0552
Operating System:win2k
Hi,
after working six weeks with originC I'm now able to solve several problems. I'm also able to "RTFM" (read the f** manual)or read the topics in the forum to get a hint for solutions.
But in my actual problem I'm not able to find the solution.
I want to fit multiple peaks with the lorentz function. Set my own initial parametersworks fine. Also the trick with the own lorentz function :"lorentzforReplicas" works well(see: http://www.originlab.com/forum/topic.asp?TOPIC_ID=4057 ).
But if I run my Programm the results also have negative y-values. But if I run the implemented menu there are only positive values.
Can anybody help me!!
greet 5*10
Here is my code:
void fit_datasegments3()
{
using nlsf = LabTalk.NLSF;
nlsf.Init();
nlsf.Func$ = "LorentzforReplicas";
nlsf.FitData$ = "A050622a0100_B";
nlsf.numReplica = 1;
nlsf.p1=0;
nlsf.p2=27.998;
nlsf.p3=0.034;
nlsf.p4=300;
nlsf.p5=28.05;
nlsf.p6= nlsf.p3;
nlsf.p7=70;
nlsf.v1 = 1;
nlsf.v2 = 1;
nlsf.v3 = 1;
nlsf.v4 = 1;
nlsf.v5 = 1;
nlsf.v6 = 1;
nlsf.v7 = 1;
string str;
str.Format("mks1 = %d;mks2 = %d;",38298, 38433);
LT_execute(str);
nlsf.Iterate(100);
nlsf.Iterate(100);
nlsf.Fit(1);
}
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| 2 L A T E S T R E P L I E S (Newest First) |
| 5*10 |
Posted - 09/22/2005 : 03:25:19 AM
Hi easwar!
Thak you for the fast replie.
I sind the files to the tech support.
Greets 5*10
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| easwar |
Posted - 09/21/2005 : 2:52:05 PM
quote:
But if I run my Programm the results also have negative y-values. But if I run the implemented menu there are only positive values.
Hi,
By "negative values", do you mean the data has no negative peaks, but the fit curve does? By "implemented menu", do you mean using the Analysis->Fit Multipeaks->Lorentzian"?
The fit can be sensitive to initial parameter values and the initial values you are using may be significantly different than the ones used with the menu item..
Best may be to send one sample data to tech support and have them take a look. If you do so, please refer to this post so they can see your code.
Easwar
OriginLab
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