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 Fit function, parameter settings
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Heckisack

9 Posts

Posted - 11/14/2014 :  05:59:31 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hello,

ich have a problem with a function i created a long time ago and now have to use again but i doesn't work as i used it the last time. The fit function uses interpolated data of rheology measurements and looks like this:


if(T>b5+p*b6){
V=(bm1+bm2*(T-(b5)))*(1-0.0894*ln(1+p/(bm3*exp(-bm4*(T-b5)))));
}
else{
V=(bs1+bs2*(T-b5))*(1-0.0894*ln(1+p/(bs3*exp(-bs4*(T-b5)))))+b7*exp(b8*(T-b5)-b9*p);
};

I have 7 interpolated curves that represent different p (pressure) values. The problem i have now is that this fit should calculate one (!) set of bm1, bm2, bm3 etc. for different values of p. I know that i had to activate or deactivate something so that origin does not calculate different sets for each p, but i tried out everything and still can't remember what i have to change. Hopefully someone here can help. If it's important, function type is set to Y-form (German Version).

Kind Regards,
Tobias

Origin Ver. and Service Release (Select Help-->About Origin): 8.6.0G
Operating System: Windows 7

Heckisack

9 Posts

Posted - 11/14/2014 :  07:20:01 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hello,

problem is solved, i found out how to share parameters.
Now i have another problem i already had three years ago, please see my topic "Fit Function Origin 6 vs 8".

Tobias
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