Curve fitting with 5 variables

Dear Matlab experts,

I want to code curve fitting with 5 variables.

I got this message from Matlab, "Too many input arguments."

I added my code here, and I want to know how to solve this problem.

Thank you in advance.

Sincerely yours,

Redwood

%%Fit: 'China'.
[xData, yData, wData, cData, zData] = prepareSurfaceData( x, y, w, c, z );

% Set up fittype and options.
ft = fittype( 'a+ b*x +c*y + d*w + e*c', 'independent', {'x', 'y', 'w', 'c'}, 'dependent', 'z' );
opts = fitoptions( ft );
opts.Display = 'Off';
opts.Lower = [0 0 0 0 0];
opts.StartPoint = [0.01 0.01 0.01 0.01 0.01];
opts.Upper = [Inf Inf Inf Inf Inf];

% Fit model to data.
[fitresult, gof] = fit( [xData, yData, wData, cData], zData, ft, opts );

[Walter Roberson]

Which line is reporting too many input arguments?

Which MATLAB version are you using?

[Redwood]

Dear Walter,

I am using Matlab R2012a.

I would like to know whether curve fitting can be worked with many variables (more than 4).

Also, I would like to know whether my coding is correct or not.

Sincerely yours,

Redwood

[Image Analyst]

Answer his first question so he can help you. Copy and paste all the red error text that you are getting.

[Redwood]

I got this in Matlab.

Error using prepareSurfaceData (line 31) Too many input arguments.

Sincerely your,

Redwood

[Walter Roberson]

prepareSurfaceData's changes are specifically documented; you can undertake them yourself; see http://www.mathworks.com/help/curvefit/preparesurfacedata.html

Answer 1

[Valeria Alejandra]

The "fit" function only supports two independent variables and you are trying to add four.

Since you are adding more than two elements in "here", then there are more than expected and matlab returns the error

fitobject = fit([here],z,fitType)