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| Levenberg Marquardt for Delphi + support for constraints http://forum.alglib.net/viewtopic.php?f=2&t=826 |
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| Author: | Rozh [ Sat Apr 27, 2013 2:20 pm ] |
| Post subject: | Levenberg Marquardt for Delphi + support for constraints |
Hello I am in desperate need for the Levenberg Marquardt for Delphi with constraints (and with numerical analysis of Jacobian and Hessian, as I cannot provide an analytic expression for those) . I can find couple of libraries providing the optimization, but I have searched for very long time now, and no one else provides the algorithm including the option for constraints. I have downloaded the 2.6 version of AlgLib, but this does not allow for constraints (is this correct? I could not find it anyways). Is there any chance that the 3.x branch will be ported to Delphi anytime soon ? Or alternatively that the 2.x branch including Delphi supported will be updated to include support for constraints ? I dont know if iot will make sense but could one make an ActiveX object to be accessed from Delphi or a dll ? I will be eternally grateful if you can help me Kind regards Rozh |
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| Author: | Rozh [ Sat Dec 14, 2013 3:06 pm ] |
| Post subject: | Re: Levenberg Marquardt for Delphi + support for constraints |
Hello again I am still looking for an answer to this question. Can anyone help med please ? best regards Rozh |
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| Author: | zzafarsuppari [ Mon Jan 26, 2015 12:35 pm ] |
| Post subject: | Re: Levenberg Marquardt for Delphi + support for constraints |
I am using c# and it is in the alglibinternal component. |
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| Author: | dediggefedde [ Fri Jan 30, 2015 5:46 pm ] |
| Post subject: | Re: Levenberg Marquardt for Delphi + support for constraints |
As far as I know, constraints in C++ can be used by calling Code: real_1d_array param= "[1,2,3]"; real_1d_array bndl = "[-1e8,-1e8,-1e8]"; real_1d_array bndu = "[1e8,1e8,1e8]"; lsfitsetbc(state, bndl, bndu); In this case, a fit that is supposed to fit 3 parameters will limit the area of parameters from -1e8 to 1e8. To fixate a parameter during a fit, you can set Code: bndl[1]=bndu[1]=param[1]; So param[1] won't get changed... At least that's how I understood this option.^^ And as the .h file states, this function is copyrighted at the 14.01.2011, so I suppose it's also available in the delphi package? If you meant other kinds of constrains then I', sorry for misunderstanding your question. |
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