| T O P I C R E V I E W |
| chris_1877 |
Posted - 02/02/2009 : 08:34:48 AM
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
|
| 3 L A T E S T R E P L I E S (Newest First) |
| chris_1877 |
Posted - 02/06/2009 : 06:06:30 AM
Hi Deanna!
Thank you - I think I will update to the newer patch.
Chris |
| Deanna |
Posted - 02/02/2009 : 9:32:14 PM
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 |
| chris_1877 |
Posted - 02/02/2009 : 08:52:50 AM
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 |
