Regression - Instruction
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From: Andreas Bauer on 8 Jun 2010 03:33 Hello, a b c fx 0,639242 0,032636 19,819060 fy 0,003413 -0,646874 273,495500 MustBe x MustBe y Measure X Measure Y 173,000 12,500 130,816 266,000 275,500 28,500 196,860 256,000 139,500 153,000 113,987 175,000 a) How can I calculate it with C++? b) How is the correct algorithm? If I make it by hand. Have somebody a good instruction? c) Maybe I can use Excel, or? Thanks. Regards Andreas
From: Giovanni Dicanio on 8 Jun 2010 03:53 On 08/06/2010 09:33, Andreas Bauer wrote: > a) How can I calculate it with C++? > b) How is the correct algorithm? If I make it by hand. > Have somebody a good instruction? > c) Maybe I can use Excel, or? Excel can compute regressions out-of-the-box: the Excel programmers already wrote the regression code, so you could just use it via the Excel user interface. If you want to write your own regression routine/class in C++, you may want to start from the mathematical description of the problem, which you could find e.g. on Wikipedia: http://en.wikipedia.org/wiki/Linear_regression_model and if you practice your <<insert search engine here>> skills, you could find already written C/C++ code (actually, in the aforementioned Wikipedia article, there are links to that). HTH, Giovanni
From: Andreas Bauer on 10 Jun 2010 05:39 Hello Giovanni, here I send more details and hope is clear. I need more informations, it is not so easy. I hope the pictures are clear. http://www1.minpic.de/bild_anzeigen.php?id=114414&key=77476860&ende http://www1.minpic.de/bild_anzeigen.php?id=114415&key=92154987&ende First, I measure my 3 or more points. Second, I check the units(steps) to the axis. (Step motor) Third, I should calculate the coefficient. How is the best, easiest way? Thanks for tipps. Greeting Andreas.
From: Joseph M. Newcomer on 10 Jun 2010 14:25 See below... On Tue, 08 Jun 2010 09:33:01 +0200, Andreas Bauer <com(a)news.de> wrote: >Hello, > > a b c >fx 0,639242 0,032636 19,819060 >fy 0,003413 -0,646874 273,495500 > > >MustBe x MustBe y Measure X Measure Y >173,000 12,500 130,816 266,000 >275,500 28,500 196,860 256,000 >139,500 153,000 113,987 175,000 > > >a) How can I calculate it with C++? **** How do you calculate it *without* C++? Just convert that formula to C++ code! ***** >b) How is the correct algorithm? If I make it by hand. > Have somebody a good instruction? **** I have no idea what you want, so I have no way of knowing what you got, and whether or not it is correct. That's going to be *your* problem to determine its correctness. **** >c) Maybe I can use Excel, or? ***** If you have an algorithm, you code it in any language you want. If you don't have an algorithm, you can't code it in any language. See http://en.wikipedia.org/wiki/Regression_analysis **** > > > >Thanks. Regards Andreas Joseph M. Newcomer [MVP] email: newcomer(a)flounder.com Web: http://www.flounder.com MVP Tips: http://www.flounder.com/mvp_tips.htm
From: Andreas Bauer on 11 Jun 2010 03:41
Hello Joseph > > http://en.wikipedia.org/wiki/Regression_analysis > **** >> >> >> Thanks. Regards Andreas > Joseph M. Newcomer [MVP] it is not clear. On my Excel sheet, you see may problem Two axis x y Customer insert the values in mm, axis controller needs steps. First I should calibrate the system. http://www.fileuploadx.de/49586 How? How I get a,b and the offset c? Do you have a step by step instruction. Tutorial? Thanks. Regards Andreas |