The fitters module contains two scilab functions polyfit.sci: polynomial regression linfit.sci: linear regression over multiple independent variables
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Hi, Does the linfit function satisfy the same API as Matlab/linfit : http://www.mathworks.com/help/toolbox/stats/nlinfit.html Do you have examples using your functions ? Best regards, Michaël Baudin
Hi, Is there an advantage of your polyfit with respect to stibox/polyfit: http://forge.scilab.org/index.php/p/stixbox/source/tree/master/macros/polyfit.sci Best regards, Michaël Baudin
Well in brief -Matlab's nlfit is based on the Levenberg–Marquardt algorithm (LMA), which is an iterative procedure. Therefore its results depend on the choice of parameters for the convergence of the method. LMA can be applied to linear problems (which are a particular case of the general non-linear problems), but it is possible that different choices of parameters produce different sets of coefficients for the same data set. -linfit is a non-iterative procedure based on the analytic solution of the equations resulting from the application of the minimum conditions. It allways produce the same result, and does not require an initial estimation of the values of the parameters. But it does not solve non-linear problems.
Sorry, it wasn't my intention to use the same name as your code, simply I wasn't aware of the existence of another polyfit in stixbox. Since no polyfit appears in Scilab's help I assumed there wasn't one, and I didn't checked Git/stixbox. I chose the name trying to make it clear it has the same purpose as the Matlab's polyfit. Comparing the two codes I realized that the results seems to be the same, but my implementation offers two options for the output, a Scilab polynomial object or a matrix ordered as in Matlab, besides graphic comparison. Given that the purpose of linfit and polyfit seems to fit ;) in Git/stixbox I would suggest in incorporate them into that project.
Hi, can you please tel me haw can i use this package to use polyfit function, I am working with Scilab for 1 weak a go. thanks
please help me, I don't know haw can I install this fitters zip!!!!!
> please help me, I don't know haw can I install this fitters zip!!!!! Sorry but installation with atoms is not possible, it seems that the module was never packaged after I uploaded it. Anyway the documentation (manuals in pdf format) is in the docs folder, and the functions are in the files linfit.sci and polyfit.sci. Therefore you can load the functions in memory by executing these files after unzip fitters.zip. The usage is described in the manuals. Best regards Javier
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