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mej42

2 Posts
Posted - 05/10/2015 :  4:32:06 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hi everybody

I would like to fit an experimental curve using 3 other experimental curves . We don't know the algebric function of the 3 curves, we have only these data, so an x column and 3 y columns. The best fitting functions obtained must be a linear combinations of the three base lineshapes.

thanks

Origin 6.0 under win7
Edited by - mej42 on 05/11/2015 12:46:28 PM

SeanMao

China
288 Posts
Posted - 05/10/2015 :  11:37:44 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

Since Origin 9.1, a Rank Model tool has been implemented to allow you fit your dataset with multiple functions and rank the fitting results to obtain the best model.

A video tutorial and reference page are shown below:
http://www.originlab.com/Index.aspx?go=Support/VideoTutorials&pid=1931

http://www.originlab.com/doc/Origin-Help/fitrank-multi-func

For multiple datasets, if it is replicate data from repeat measurement, you can use our Concatenate fit:

http://www.originlab.com/index.aspx?go=Products/Origin/DataAnalysis/CurveFitting&pid=1190

If you want to fit all three curves as a group for different fitting models, you may refer to this newly written blog:

http://blog.originlab.com/data-analysis/script-to-find-best-fitting-model-for-each-data-in-each-group-and-create-summary-report

However, all the function mentioned above are implemented in version later than 6.0.

You can try downloading a demo version Origin 2015 to try out those features:

http://originlab.com/demodownload.aspx

Regards!

Sean

OriginLab Tech. Service
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mej42

2 Posts
Posted - 05/11/2015 :  12:40:21 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

These tutorials are very interesting.
My 3 curves are not described by a known mathematical function but only by a x (the same for the 3) and y (different for the 3) columns.

How to do this??

Regards
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SeanMao

China
288 Posts
Posted - 05/12/2015 :  02:04:08 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

What exactly do you want to fit? Fit all three Ys with a same fitting function or concatenate three Ys into 1 curve and fit it?

As I mentioned before, if you are not sure what function is suitable for your data, you can run fitting for a list of functions and choose the best fitted model.

Regards!

Sean
Edited by - SeanMao on 05/12/2015 02:05:01 AM
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