Note: You can also use the Fix Intercept option in the Linear Fit dialog to force the linear fitted line to go through the origin point. Now you can see the curve go through zero. Click the Fit until converged to fit the curve again. Now go to the Parameters tab, check the Fixed checkbox for parameter A and fix the value to 0.You can see from the Fit Curve tab that the curve does not go through the origin point. This option will lengthen the fitted curve. Under the X Data Type branch, make sure the Range option is Use Input Data Range + Margin, and then enter 10 in the Range Margin(%) edit box. Click the Fitted Curves page on Settings tab.Choose the Line function after selecting the Polynomial category.Highlight one of the Y column, column D for example, and select Analysis: Fitting: Nonlinear Curve Fit to bring up the NLFit dialog.Import the data " \Samples\Curve Fitting\Linear Fit.dat" into an Origin worksheet.In this particular case we know that if we let, the line will go through (0,0). One typical example: force the fitted line to go through the origin point, (0, 0), when fitting a straight line. This method works only when the point you want to fit through is related to a function parameter. Use general linear constraints in nonlinear fitting.Įxample and Steps Fixing Function Parameters.Fix fitting parameters during nonlinear fitting.Learn different methods to force a curve to go through a point.Choice of method depends on function expression and the data point you want the fit curve to go through. This tutorial shows you three methods to force a fit curve to go thru a particular point.
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