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Bazzzil
Russia
1 Posts |
 Posted - 12/01/2012 : 09:15:08 AM
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Greetings!
My situation is the following: let's say we have 2 Y-colums (y1 and y2) and their common X-column (x). I need to fit y2 (with a polynom of degree 2) to y2, i.e. provide such parameters A, b, c, d, that corresponds best for the following equation: y1(x) = A*y2(x)+b+c*x+d*x^2. I found out, that it is quite possible in OriginPro9 with Nonlinear Implicit Curve Fit by creating implicit function f = y1 - (A*y2+b+c*x+d*x^2). So, I have 2 questions:
1) Is there an easier way to perform such analysis?
2) If not, It would be very usefull to perform preview with both y(x) = y1(x) and y(x) = (A*y2+b+c*x+d*x^2), and have y(x) = (A*y2+b+c*x+d*x^2) as a separate colum in the worksheet after fitting. What are the possible ways to perform this?
Tank you for reading.
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Sam Fang
293 Posts |
Posted - 12/03/2012 : 12:46:15 AM
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Of course you can use implicit fitting in Origin9.0.
In fact you can also use explicit fitting in Origin. You can define it as:
Independent variable: x, y2;
Dependent variable: y1;
Parameter: A, b, c, d;
Function y1=A*y2+b+c*x+d*x^2
Note that Origin's Nonlinear Curve Fit supports multiple independent variables.
Sam
OriginLab Technical Services |
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Fitting one user's data with another.