MATLAB: Sftool with X and Y axis of not the same lengths

sftool

Hi all, I am new to sftool. i have x=1:14 and y=1:16. In addition i have the measured data z (14×16). I am trying to model the behavior of z as function of x and y. I tried sftool but i always get this error :X, Y and Z must be the same length.

 x, y and z are set as columns z=z(:) x=x(:) and y=y(:).

I don't what to do!!

Thank you for you help in advance.

Best Answer

i had just to generate X and Y axis using meshgrid and it works!

Related Solutions

MATLAB: Sftool

Hi Zahra, No, sftool did not exist in MATLAB version 7.1.

sftool was introduced in R2009a.

In the most recent version of MATLAB, it is recommended that you use cftool instead of sftool.

MATLAB: How to get fitting parameter in sftool.

The generated code should look something like this:

%%Initialization.
% Convert all inputs to column vectors.
x = x(:);
y = y(:);
z = z(:);
%%Fit: 'untitled fit 1'.
ft = fittype( 'poly11' );
opts = fitoptions( ft );
opts.Weights = zeros(1,0);
[fitresult, gof] = fit( [x, y], z, ft, opts );
% Plot fit with data.
figure( 'Name', 'untitled fit 1' );
h = plot( fitresult, [x, y], z );
legend( h, 'untitled fit 1', 'z vs. x, y', 'Location', 'NorthEast' );
% Label axes
xlabel( 'x' );
ylabel( 'y' );
zlabel( 'z' );
grid on

And fitting parameters are stored in fitresult:

fitresult.p00
fitresult.p01
fitresult.p10

Best Answer

Related Solutions

MATLAB: Sftool

MATLAB: How to get fitting parameter in sftool.

Related Question