Curve fitting with 5 variables

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Redwood
Redwood 2013-4-14
编辑： Valeria Alejandra 2024-9-6
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 );
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Redwood
Redwood 2013-4-15
I got this in Matlab.
Error using prepareSurfaceData (line 31) Too many input arguments.
Sincerely your,
Redwood
Walter Roberson
Walter Roberson 2013-4-15
prepareSurfaceData's changes are specifically documented; you can undertake them yourself; see http://www.mathworks.com/help/curvefit/preparesurfacedata.html

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回答（1 个）

Valeria Alejandra
编辑：Valeria Alejandra 2024-9-6
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)

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