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frontliner
UK
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 Posted - 08/27/2005 : 3:45:35 PM
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Origin Version (Select Help-->About Origin): 7.5 SR0
Operating System: Windows XP
Hi everybody,
I am a new user for origin, and I have a problem I can't solve it.
I have database consists of 3 column of data, Z, X/U, Y/U, where Z is the requested variable or requested controlling equation of type Z=f(X/U,Y/U) so we have 4 variable here.
How can I find the equation Z=f(X/U,Y/U) ?
Any help is really appreciated!
Thanks
Regards |
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frontliner
UK
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Posted - 09/02/2005 : 06:54:36 AM
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| Nobody out there for help? :( |
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frontliner
UK
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Posted - 09/02/2005 : 07:04:36 AM
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I know this should be done by script.
I have 3 columns of data, A(X), C(Y) and B(Y) where B(Y) is Z (the wanted equation).
Assuming the script is right, would you please correct me with the following steps:
1-Analysis>Non-linear curve fit>Advanced fitting tool
2-Function>new then create my function with name user1 having the wanted parameters p1,p2,p3, then I select it
3-Scripts>before fit> enabled then type in your script
4-I checked (Same X as fitting data)
5-I highlighted the 3rd column in my database B(Y)
6- I clicked on "Basic mode" then click on "Start fitting"
I am sorry for being a beginner, any help is really appreciated
Thanks a lot |
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easwar
USA
1965 Posts |
Posted - 09/02/2005 : 09:41:50 AM
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Hi frontliner,
Are you looking for LabTalk script, or procedure to manually fit the data using the NLSF tool?
Looks like what you need to do is fitting with multiple independent variables:
Please take a look at the following:
1> Knowledge base item on our website, searchable from Support area:
http://www.originlab.com/www/support/resultstech.aspx?ID=57&language=English
2> Origin Help file topic:
Fitting With Multiple Independent Variables
As for programmatic fitting, please look at the Programming Help file and the LabTalk Language Reference section. There you can look at the NLSF object and its properties and methods. You can then use NLSF object and set properties such as number of indep vars, which column to use for which indep var etc. You should first create the FDF with your fitting function and then you can programmatically use the FDF from your script.
Easwar
OriginLab
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Finding equation controlling 3 variables