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Or any other function that could take several pairs as input and output the fitted curve or function in the format you want.

Huayi Guo
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You should check out Commons Math from Apache Commons.

The Statistics package has a Class called SimpleRegression that may be helpful to you.

Matthew J. Geiger
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  • Good information, but I think `SimpleRegression` is most similar to using `polyfit` to do linear regression in matlab. I think he wants something a little more general (see below). – Joshua Barr May 21 '13 at 16:00
  • Nice suggestion. I have Looked it up and found it is a good package to do linear regression, but is there any package for non-linear regression? – Huayi Guo May 21 '13 at 17:56
  • @Huayi Guo. You can try this code: [Michael Thomas Flanagan's Java Scientific Library](http://www.ee.ucl.ac.uk/~mflanaga/java/Regression.html). It worked well, but could not use because of the license agreement. – Matthew J. Geiger May 21 '13 at 18:14
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Check out the linear algebra and optimization functionality of the Apache Commons Math library. You probably want something that implements the DecompositionSolver interface.

Joshua Barr
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  • I have skimmed the source. Nice one to do linear fit. Thanks a lot. But have you heard any lib that could do non-linear fit? – Huayi Guo May 21 '13 at 18:32
  • Apache Commons can; see the [optimization](http://commons.apache.org/proper/commons-math/userguide/optimization.html) link I gave above. Unlike the linear algebra stuff, it is not specific to linear least squares. – Joshua Barr May 22 '13 at 05:46
  • It worked. It is exactly what I am seeking for. Thanks a lot for helping @Joshua Barr – Huayi Guo May 22 '13 at 15:57
  • No problem. If it was useful, can you accept one of the answers (Matthew's or mine)? – Joshua Barr May 23 '13 at 07:59