Regression - Instruction
in [CSharp]
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From: Andreas Bauer on 8 Jun 2010 03:34 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? It is Taylor? Thanks. Regards Andreas
From: Arne Vajhøj on 8 Jun 2010 20:04 On 08-06-2010 03:34, Andreas Bauer wrote: > 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? > > It is Taylor? Maybe you should start by explaining in more detail what this is. It is not obvious what the data represents nor what you want to calculate. Arne
From: Andreas Bauer on 10 Jun 2010 05:50 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. --Simple linear regression, or? http://www1.minpic.de/bild_anzeigen.php?id=114417&key=82156785&ende Greeting Andreas.
From: Arne Vajhøj on 10 Jun 2010 20:41 On 10-06-2010 05:50, Andreas Bauer wrote: > 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. > > --Simple linear regression, or? Yes. Simple linear regression. http://www.mathdotnet.com/ can do it. Some old code from the shelf: private static void Solve(double[] y, out double[] b, double[] x) { Vector one = Vector.Ones(x.Length); Vector x2 = Vector.Create(x); Matrix x3 = Matrix.CreateFromColumns(new List<Vector> { one, x2 }); Vector y2 = Vector.Create(y); Matrix y3 = Matrix.CreateFromColumns(new List<Vector> { y2 }); Matrix b3 = x3.Solve(y3); Vector b2 = b3.GetColumnVector(0); b = b2.CopyToArray(); } Arne
From: Andreas Bauer on 11 Jun 2010 03:39
Hello Arne, >> --Simple linear regression, or? > > Yes. > > Simple linear regression. > > http://www.mathdotnet.com/ > > can do it. > > Some old code from the shelf: > > private static void Solve(double[] y, out double[] b, double[] x) > { > Vector one = Vector.Ones(x.Length); > Vector x2 = Vector.Create(x); > Matrix x3 = Matrix.CreateFromColumns(new List<Vector> { one, > x2 }); > Vector y2 = Vector.Create(y); > Matrix y3 = Matrix.CreateFromColumns(new List<Vector> { y2 }); > Matrix b3 = x3.Solve(y3); > Vector b2 = b3.GetColumnVector(0); > b = b2.CopyToArray(); > } 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? Thanks. Regards Andreas |