I want to fit curve non-linear regresion of isotherm freundlich, Langmuir I-II-III-IV, BET, Tempkin, and Dubinin-Radushkevich by originlab. If any one have expereince and help me in build non-linear equation of isotherm model by originlab program I would be grateful to him.
You can try to use the tool for nonlinear fit in the softwear. In ther you will find an option which name is somewhat related to programing . Depending on the version of Origin Lab that you are using it can be hard or easy. If you are using an older version, it can be hard, I don't know how to help you, but from version 9 and on it is very easy, acctually you are going to find the instrctions there. Any problem, try the forum https://www.originlab.com/forum/
I recommend TableCurve 2D®. In Tab "process" navigate to "User Functions" type the isotherm equation as:
Y=A0*X/(1+A1*X)
Change "Adjustable parameters cont" to 2
or
Y=A0*A1*X/(1+A2*X)
Change "Adjustable parameters cont" to 3
Then choose Fit UDFs.
In Tab "Review" you can see the constants value and the graph.
The obtained data can be saved as Excel file as well.
By the way, the demo software can be used for 1 month for free!
Dear Badr
I recommend the cftool, which is the "curve fitting toolbox" of Matlab software.
Excel solver add-in is another solution.
Thanks for all. I use version 8 of originlab, in this version available two equation of Langmuir model, but i want fit my data by nonlinear equation through this equation q = Qmax*KL*Ce/1+KLCe. could anyone help me how can build this equation by origin through this tool (fitting function organizer) like in attached file
Please, some know how to build the non-linear Dubinin-Radushkevich iisotherm equation in Origin 8.0?
I need to use in my data.
Dear Binu Singh,
I am sending you a document I did for my students for Origin 8.0.
I hope it helps you.
Regards,
Geórgia.
I propose the use of GraphPad_Prism to build non-linear model for all the prevalent isotherm. Find the blow link:
Article Synthesis of nano-magnetic MnFe2O4 to remove Cr(III) and Cr(...
I, also want to the explanation Languimer EXT1, plotted with origin17 software and equation have constant a, b, c how can explain any research paper anyone can provide
y= ab xc-1/1+bxc-1
I want to do the same think but allways when i run the fitting it dosen't work i guess that i have a problem in the bounds of parameters. if any one has a solution form me please don't hesitate.
Any one can help how to fi extended model of langmuir in origin8 pls
What is needed is one of the many minimization methods of multivariable function which is a measure of fit of the given adsorption isotherm to the equilibrium data.
Badr M. Thamer Curve fitting of multiple peaks in origin
I have worked a lot on the different kinds of fitting. In this video, I have discussed the multiple peak fitting. How to customize a fitting equation or how to generate one’s own fitting equation. I have discussed in detail all the dependent variables. In the case you want to further ask about it, please do comment on the specific video, I'll respond to it shortly. I have provided the practice file(s) here. Thanks
https://youtu.be/ViIdEllu5pA
While, for other fittings, one may see as, like linear fitting (https://youtu.be/ViIdEllu5pA), polynomial fitting (https://youtu.be/JrL5ebTq5qM), nonlinear curve fitting (https://youtu.be/hkjsvbo6U30), exponential decay fitting (https://youtu.be/pdiOc86IZ6U), histogram fitting (https://youtu.be/cfW88FZzsyA), and Nonlinear fitting with constraints (https://youtu.be/XLdxjW1iQmc).
These videos can answer your questions: https://www.youtube.com/channel/UC5MiS3nMoji95OZ7uE1V8qw/playlists?view=50&sort=dd&shelf_id=6
Dear Aminul,
I use Origin and I am sending you a tutorial.
Best regards,
Geórgia Labuto.
- Badges
- Science topic
- Similar topics
- Mathematical Sciences
- Graphs