Show norm of residuals - If checked, the norm of residuals are displayed. If you use subplots to plot multiple data sets, then residuals can be plotted only in a separate figure window. You can display the residuals as a bar plot, as a scatter plot, or as a line plot in the same figure window as the data or in a separate figure window. The fit residuals are defined as the difference between the ordinate data point and the resulting fit for each abscissa data point. Plot residuals - If checked, the fit residuals are displayed. Significant digits - Select the significant digits associated with the equation display. Show equations - If checked, the fit equation is displayed on the plot. 
If your fit uses polynomials with more than N coefficients, the interface automatically sets a sufficient number of coefficients to 0 during the calculation so that the system is not underdetermined.
If your data set has N points, then you should use polynomials with, at most, N coefficients. You can choose as many fits for a given data set as you want. The polynomial fits use the polyfit function. Refer to the pchip online help for a comparison of these two functions. The spline interpolant uses the spline function, while the shape-preserving interpolant uses the pchip function. There are two types of fits to choose from: interpolants and polynomials. Check to display fits on figure - Select the fits you want to display for the current data set. Plot fits - This panel allows you to visually explore one or more fits to the current data set: A warning is displayed if a fit produces results that may be inaccurate. You may need to center and scale your data to improve the accuracy of the subsequent numerical computations. Use the Plot Editor to change the name of a data set.Ĭenter and scale X data - If checked, the data is centered at zero mean and scaled to unit standard deviation. However, you can perform multiple fits for the current data set. The current data set is defined as the data set that is to be fit. Use this list to select the current data set. Select data - This parameter list is populated with the names of all the data sets you display in the figure window associated with the Basic Fitting interface. Select Basic Fitting from the Tools menu. To reproduce this state, follow these three steps: #Matlab norm full
The full Basic Fitting interface is shown below.
However, if you plot multiple data sets as a subplot, and at least one data set is 2-D, then the interface is enabled.įor the HP, IBM, and SGI platforms, the Basic Fitting interface is not supported for Release 13.
You can use the Basic Fitting interface only with 2-D data. Save the fit and evaluated results to the MATLAB workspace.ĭepending on your specific curve fitting application, you can use the Basic Fitting interface, the command line functionality, or both.Annotate the plot with the numerical fit results and the norm of residuals.Evaluate (interpolate or extrapolate) a fit.Examine the numerical results of a fit.Plot multiple fits simultaneously for a given data set.Fit data using a spline interpolant, a shape-preserving interpolant, or a polynomial up to degree 10.The interface is designed so that you can: Using this interface, you can quickly perform many curve fitting tasks within the same easy-to-use environment. MATLAB supports curve fitting through the Basic Fitting interface. Data Analysis and Statistics (Mathematics) Mathematics
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