MATLAB: Getting the values from the curve fitted model

curve fittingMATLAB

Is there a way i can get the new values of the datas ( x and y) from the curve fitted model?

Best Answer

If you used fit:

p=fit(...) %your model
y=p(x) %evaluate your model at x

Similarily, if you used polyfit:

p=polyfit(...) %your model
y=polyval(p,x) %evaluate your model at x

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MATLAB: Constraining a fitted curve

I'd strongly recommend that you look at a file exchange submission by John D'Errico titled "Shape Modeling Language"

http://www.mathworks.com/matlabcentral/fileexchange/24443

MATLAB: How to specify a model asa FITTYPE object and not as a function using the Curve Fitting Toolbox

You can specify a FITTYPE object as your fit model in FIT function.

Use an object FITTYPE (different from CFIT). Here is an example which demsonstrates how to do this:

   f1 = fittype('a*x+b')
 f1 =
      General model:
        f1(a,b,x) = a*x+b

Now, you can use this model to fit different data set. For example:

x = 0:10; y = sin(x);
f2 = fit(x',y',f1)
 f2 =
   General model:
     f2(x) = a*x+b
   Coefficients (with 95% confidence bounds):
     a =    -0.02444  (-0.1812, 0.1323)
     b =      0.2505  (-0.677, 1.178)

Best Answer

Related Solutions

MATLAB: Constraining a fitted curve

MATLAB: How to specify a model asa FITTYPE object and not as a function using the Curve Fitting Toolbox

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