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Two Dimensional Surface Fitting Program

version 1.0 (44 KB) by

A two dimensional surface fitting program

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This program represents a further development of the standard powerful “nlinfit” facility already in matlab. The major problem with “nlinfit” is that it can only handle fitting of one dimensional arrays (x, y) where x is the independent variable and y is the dependent one.
The program fit2 uses another program “fitfit” where the user fitting function can be defined. This user defined function is defined in line 6 of fitfit as ff in terms of a,x,y.

The input arguments to the program are
 1- a which is an array representing the starting values of the free
    fitting parameters ( similar to that when nlinfit is used)
   The length of a must be equal to the number of parameters used in the user
    defined function to be fitted (line 6 in the M-file "fitfit"
 2- x and y are each a one dimensional array representing the independent
    variables
 3- z is the dependent variable matrix whose elements are functions of the
    meshgrid values of x and y
 please read the pdf file for more information and example

Comments and Ratings (1)

beautiful work... thanks...
I am fitting for Gaussian 2D. I am working to get error bar (COVB) from this program. If someone have that, please add comment here... Thanks..

For my version, R2009a (following needed to be changed)
mat=ver2mat(a,i); to j=length(a)/i; mat=reshape(z,i,j);

psurface(x,y,z); to 'surf' or anything you prefer

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MATLAB 7.4 (R2007a)

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