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jmb22

USA
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Posted - 07/23/2005 :  3:10:51 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version (Select Help-->About Origin): 7.5
Operating System:XP

Hey,

I am trying to compile the following function in code builder to be used as a fitting function:

y = P1+2*(1+P2*1.865E-2*(1/(1.865E-2*P3)))^-1*((2.36)^2)*6.4899*1/x;
There are 3 fitting parameters: P1, P2 and P3.

When I try to compile the function, I get the following:

compiling...
_nlfspinpumpfnn.fit
C:\Program Files\OriginLab\OriginPro75\Jean-Marc Beaujour\OriginC\NLSF\_nlfspinpumpfnn.fit(40) :Error, invalid term
C:\Program Files\OriginLab\OriginPro75\Jean-Marc Beaujour\OriginC\NLSF\_nlfspinpumpfnn.fit(40) :Error, general compile error
C:\Program Files\OriginLab\OriginPro75\Jean-Marc Beaujour\OriginC\NLSF\_nlfspinpumpfnn.fit(31) :Error, error(s) found in compiling function _nlsfspinpumpfnn

i checked the parenthesis and all the terms ... it seems to be alright. I used Mathematica to fit the experimental data and that works. So what's the problem??

Thanx.

Mike Buess

USA
3037 Posts
Posted - 07/24/2005 :  07:03:07 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

It compiles if you bracket what appears to be the entire exponent...

y = P1+2*(1+P2*1.865E-2*(1/(1.865E-2*P3)))^(-1*((2.36)^2)*6.4899*1/x);

However, if that is correct then your equation is somewhat simpler than you have written it...

double C1 = 6.4899 * 2.36^2;
double C2 = 1.865E-2;
y = P1 + 2*(1 + P2*C2*(1/(C2*P3)))^(-1*C1*1/x);
- which reduces to -
y = P1 + 2*(1 + P2/P3)^(-C1/x);

In other words, you only need two fitting parameters.

Mike Buess
Origin WebRing Member

Edited by - Mike Buess on 07/24/2005 07:31:42 AM
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jmb22

USA
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Posted - 07/25/2005 :  09:42:14 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
The exponent should be -1 and not (-1*2.36^2).

Thanx for your help.
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