Regression - Instruction
in [CSharp]
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From: Arne Vajhøj on 15 Jun 2010 21:59 On 15-06-2010 05:07, Andreas Bauer wrote: >> formula y = your fx >> formula x = [your x your y all 1's] >> formula b = [your a your b your c] >> > b is clear. > > Can you give me an answer for that? > > I hope the last questions. > Why this way? This way is correct, I'm sure. > StepsToAxis<=> UserCoordinatesInMM > fx = a*x + b*y + c > and not the simplest way > fx = a*x + b > > How is call in mathematics? > Both 'Linear Regression' ? > > How is the best way to Round? Which function? > int stepsToAxisXInteger = Convert.ToInt32(stepsToAxisX); > int stepsToAxisXInteger = Convert.ToInt32(stepsToAxisX + 0.5); > > How is the calculation for more values? > > 3 Values > Matrix (3,3) * M(3,1) = M(3,1) > - - - > 10 Values > Matrix (10,3) * M(3,1) = M(10,1) > or? > n Values > Matrix (n,3) * M(3,1) = M(n,1) > > For b vector I need 3 (a,b,c) > How I get it, when I have more values. I have no idea what you are asking about. Arne
From: Andreas Bauer on 16 Jun 2010 15:42 Hello Arne, > I have no idea what you are asking about. > > Arne Hope now is clear. Excel Table http://www.fileuploadx.de/151465 Picture: http://www1.minpic.de/bild_anzeigen.php?id=114935&key=19057763&ende first question. How is the calculation, if I have more then 3 values. second question. fx = a*x + b*y + c this formular should be use, if I have a scale factor and a rotation third question fx = a*x + b this formular should be use, if I have only a scale factor Both are 'Linear Regression', in mathemaics calls 'Linear Regression', yes? Question 4: How is the best way to Round? Which function do you use? int stepsToAxisXInteger = Convert.ToInt32(stepsToAxisX); int stepsToAxisXInteger = Convert.ToInt32(stepsToAxisX + 0.5); I need a integer to my axis. With best regards Andreas
From: Andreas Bauer on 19 Jun 2010 09:22
Hello Arne, any tip for me. Greeting Andreas >> I have no idea what you are asking about. >> >> Arne > Hope now is clear. > > > Excel Table > http://www.fileuploadx.de/151465 > > > Picture: > http://www1.minpic.de/bild_anzeigen.php?id=114935&key=19057763&ende > > > first question. > How is the calculation, if I have more then 3 values. > > > second question. > fx = a*x + b*y + c > this formular should be use, if I have a scale factor and a rotation > > third question > fx = a*x + b > this formular should be use, if I have only a scale factor > > Both are 'Linear Regression', in mathematics calls 'Linear > Regression', yes? > > Question 4: > How is the best way to Round? Which function do you use? > int stepsToAxisXInteger = Convert.ToInt32(stepsToAxisX); > int stepsToAxisXInteger = Convert.ToInt32(stepsToAxisX + 0.5); > I need a integer to my axis. > > With best regards Andreas |