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Problem with Fitting Function

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[quote][i]Originally posted by Heckisack[/i]
[br]Origin Ver. 8.6.0G 32bit  
Operating System:Windows 7 64bit

Hello i have a problem with building a fitting function for my data. This my first try at this so i'm totally knew to that.

The function looks like this:

n/no=(1-p/pm)^(-ke*pm),

where n0 is a initial viscosity, n is a viscosity, p a filler loading, pm a maximum filler loading, ke is a free parameter.

My Data consist of various viscosities (n) and filler loadings (p). The goal is to calculate a pm for a theoretical maximum filler loading.

So i put this in the function manager and created a new function (User defined, Origin C), but when i try to compile it it gives me the following errors:

:Fehler, ung�ltiger Typ des Funktionsarguments
:Fehler, Syntaxfehler in Deklaration der Funktion.

which translates to

:Error, invalid type of function argument
:Error, declaration syntax error in function

I honestly have noc clue what i can change. I tried to put the parameters in different categories (Parameter, independent variable)but couldn't get it to work.

Anyone here that can solve my problem?
[/quote]

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T O P I C R E V I E W
Heckisack	Posted - 07/01/2014 : 03:12:40 AM Origin Ver. 8.6.0G 32bit Operating System:Windows 7 64bit Hello i have a problem with building a fitting function for my data. This my first try at this so i'm totally knew to that. The function looks like this: n/no=(1-p/pm)^(-ke*pm), where n0 is a initial viscosity, n is a viscosity, p a filler loading, pm a maximum filler loading, ke is a free parameter. My Data consist of various viscosities (n) and filler loadings (p). The goal is to calculate a pm for a theoretical maximum filler loading. So i put this in the function manager and created a new function (User defined, Origin C), but when i try to compile it it gives me the following errors: :Fehler, ung�ltiger Typ des Funktionsarguments :Fehler, Syntaxfehler in Deklaration der Funktion. which translates to :Error, invalid type of function argument :Error, declaration syntax error in function I honestly have noc clue what i can change. I tried to put the parameters in different categories (Parameter, independent variable)but couldn't get it to work. Anyone here that can solve my problem?
2 L A T E S T R E P L I E S (Newest First)
Heckisack	Posted - 07/02/2014 : 01:45:45 AM Thank you for your answer, the main error was the "/" on the left side of the equation. It worked now, thanks again!
snowli	Posted - 07/01/2014 : 10:11:42 AM Hello, You can choose Tools: Fitting Function Builder which can guide you step by step to define a function. Name and Type page: Choose OriginC as function type Variables and Parameters page Set Independent variable as p Set dependent variable as n Set parameter and constants. Or you can set no, pm, ke all as parameters Origin C Fitting Function page We don't support using / on the left of =, so try to define as follows n=no * (1-p/pm)^(-ke*pm) There is a running man button to help you test with some changing p values, if some n output shows. You can enter pm, no as Fixed on the page so when fitting, they will not change. On our Video Tutorials page, you can find many Curve Fitting videos which may be helpful for you. http://originlab.com/index.aspx?go=SUPPORT/VideoTutorials Hope it helps! Thanks, Snow OriginLab Corp.

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