Curve Fitting Toolbox

Saving the Fit Results

By clicking the Save to workspace button, you can save the selected fit and the associated fit results to the MATLAB workspace. The fit is saved as a MATLAB object and the associated fit results are saved as structures. This example saves all the fit results for the best fit, poly2.

fittedmodel1 is saved as a Curve Fitting Toolbox cfit object.

• whos fittedmodel1
  
    Name               Size                   Bytes  Class
    fittedmodel1       1x1                     6178  cfit object
  
  Grand total is 386 elements using 6178 bytes
  

The cfit object display includes the model, the fitted coefficients, and the confidence bounds for the fitted coefficients.

• fittedmodel1
  
  fittedmodel1 =
       Linear model Poly2:
         fittedmodel1(x) = p1*x^2 + p2*x + p3
       Coefficients (with 95% confidence bounds):
         p1 =    0.006541  (0.006124, 0.006958)
         p2 =      -23.51  (-25.09, -21.93)
         p3 =  2.113e+004  (1.964e+004, 2.262e+004)
  

The goodness1 structure contains goodness of fit results.

• goodness1
  
  goodness1 = 
             sse: 159.0293
         rsquare: 0.9987
             dfe: 18
      adjrsquare: 0.9986
            rmse: 2.9724
  

The output1 structure contains additional information associated with the fit.

• output1
  
  output1 = 
         numobs: 21
       numparam: 3
      residuals: [21x1 double]
       Jacobian: [21x3 double]
       exitflag: 1
      algorithm: 'QR factorization and solve'
  

Determining the Best Fit

Analyzing the Fit