Why do I recieve an error when trying to change the Line Width of a plot line?

I obtained a curve with the "Curve Fitter" App and in "Export Options" I chose "Generate a code".

When I try to modify the script just for changing the line width, the code doesn't run any more and returns an error.

Please can anyone help me to fix it? How can I change the line width?

Thank you!

Answer 1

[Voss]

The Name,Value pairs supported in plot from the Curve Fitting Toolbox (reference) are different than the Name,Value pairs supported in plot in base MATLAB (reference).

In particular, LineWidth is not supported in Curve Fitting Toolbox plot, so you have to modify the LineWidth of the appropriate line after the plot call:

% random data
xData = (1:10).';
yData = randn(10,1);

% Set up fittype and options.
ft = fittype( 'poly2' );

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

% Plot fit with data.
h = plot( fitresult, xData, yData) % two lines

h = 
  2×1 Line array:

  Line    (data)
  Line    (fitted curve)

% Set LineWidth of the fit line ( h(2) ) to 2.
set(h(2), 'LineWidth', 2)

[Klaudio Myrtaj]

Understood, thank you so much!

[Voss]

You're welcome!

Answer 2

[Walter Roberson]

https://www.mathworks.com/help/curvefit/cfit.plot.html#namevaluepairarguments

plot() of cfit or sfit objects is not the regular data plot() and does not support line width.

You might be able to locate lines after they are drawn and change their properties.

[Klaudio Myrtaj]

Thank you, I didn’t know it. It was the first time I wanted to change the line width of of a curve fit.