MATLAB: Is there an error in the documentation of the Curve Fitting Toolbox for the example on different plotting options

curveCurve Fitting Toolboxfittingplotpredfpredfuncpredopredobs

The example can be seen at the following URL:

http://www.mathworks.com/access/helpdesk/help/toolbox/curvefit/plot.shtml

When I execute the following command:

plot(fit1,'k-',x,y,'b.','predf','predo',0.99);

I receive the following error:

 ??? Error using ==> cfit/plot
 Argument 8 is incorrect

Best Answer

This bug has been fixed for Release 14 (R14). For previous releases, please read below for any possible workarounds:

This is an error within the documentation for the Curve Fitting Toolbox 1.1 (R13.0.1) within the example for the PLOT function.

The documentation should read as follows:

plot(fit1,'k-',x,y,'b.','predfunc','predobs',0.99);

Related Solutions

MATLAB: How to obtain the coefficient values, confidence intervals, and other data generated by the CFTOOL GUI within the Curve Fitting Toolbox from the saved fitted model object

This enhancement has been applied for Release 14 SP1 (R14SP1). For previous releases, read below for any possible workarounds:

To obtain the coefficient values from a "cfit" object, use the COEFFVALUES function. For example, if you saved a fitted model from the CFTOOL to a variable named "MyModel", the following command will extract the coefficient values:

MyCoeffs = coeffvalues(MyModel)

For example, the second coefficient "p2" (if it exists) can be obtained with:

coeff_2 = MyCoeffs(2)

You can also use several other functions within the Curve Fitting Toolbox to extract additional information from the "cfit" object.

 CONFINT produces the confidence intervals on the coefficients.
 DIFFERENTIATE differentiates the fit.
 INDEPNAMES extracts the names of the independent parameters of the fit.
 INTEGRATE integrates the fit.
 PLOT plots the fit.
 PREDINT computes confidence intervals on the predictions produced by the fit.

All these functions are used in a manner similar to COEFFVALUES. Refer to the documentation for the exact syntax for each of these functions.

MATLAB: I am getting error message when I try to define line specs of a plot

plot() for cfit objects is not the generalized plot function. It does not accept LineWidth parameters.

You should proceed like

h = plot(fit1, 'k-');
set(h, 'LineWidth', 2);

Best Answer

Related Solutions

MATLAB: How to obtain the coefficient values, confidence intervals, and other data generated by the CFTOOL GUI within the Curve Fitting Toolbox from the saved fitted model object

MATLAB: I am getting error message when I try to define line specs of a plot

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