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