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| Curve fitting? http://forum.alglib.net/viewtopic.php?f=2&t=563 |
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| Author: | slap [ Mon Apr 16, 2012 7:45 pm ] |
| Post subject: | Curve fitting? |
Hi, I'm completely new to this forum so please excuse me if my questions are very basic. My interest in this amazing libary is currently driven by the following: At present I use Excel's Solver to fit X-ray diffraction patterns of pure phases to other patterns which are mixtures of phases. The patterns consist of thousands of data points (x,y) and frequently a dozen or more individual pure phase patterns may be required to fit the pattern of a mixture. The mixture patern is simulated as a weighted sum of pure patterns, the best fit being obtained by minimising some objective function. I have read through quite a few posts on this forum to see if I can identify what method would be preferable for this type of problem, (I wondered if the 'lsfit subpackage' was the one I should try) but there appear to be so many variations, I don't know how to identify the best approach. I also have no idea how to code it (vb.net is the language I have some experience with) so any advice there would be welcome, but first and foremost can someone point me to the best method and variant thereof that I should be looking at for this type of problem? many thanks |
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