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chris_1877

Austria
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Posted - 02/02/2009 :  08:34:48 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin): 7G.sr1 v7.0303
Operating System: Win XP pro

Hi all!

I have a problem with generating a fit function.
The function is the Carreau model for fitting rheological data and should look like the following:

y = P1 / (1 + (P2 * x)^P3)^((1-P4)/P3)

So if I put this in and check the equation, I get a compiling error from the script window.

If I delete the last part of the equation (...^((1-P4)/P3)), then the equation is compiled without problems.
Is origin not capable for fitting with that equation? (I really can not believe that). I also tried eliminated all the blanks, and it did not change anything.

Thank you for your help,
Chris

chris_1877

Austria
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Posted - 02/02/2009 :  08:52:50 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi!

I found a solution for myself.
When "rewriting" the equation in the following form:

y = P1 *(1/(1 + (P2*x)^P3))^((1-P4)/P3)

This can be compiled - I just do not understand why it makes a difference to take out the P1 from the parentheses ...

Maybe someone can explain that to me - thanks
Chris
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Deanna

China
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Posted - 02/02/2009 :  9:32:14 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
I complied "y = P1 / (1 + (P2 * x)^P3)^((1-P4)/P3)" in my Origin 7 SR4. It suceeeded. Maybe this is a bug of early SR. You can try to patch your Origin 7 to the latest SR 4. This should fix a lot of problem.

You can visit this web page for service release information:
http://www.originlab.com/index.aspx?s=9&lm=76


Deanna
OriginLab Technical Services
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chris_1877

Austria
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Posted - 02/06/2009 :  06:06:30 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Deanna!

Thank you - I think I will update to the newer patch.

Chris
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