How do I fix: "Undefined function 'fit' for input arguments of type 'function_handle'."?

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I'm not entirely understanding the reason why the follow code doesn't work:
close all; clear all;
x = [2 4 6 8 10];
y = [0.18 0.45-.05 0.85-.1 1.35-.15 2-.2];
fun = @(a,b,c,x) -sqrt(a^2-(x-b).^2)+c;
guess = fun(15,0,15,x); % fun(a,b,c,x)
plot(x,guess,'r:')
fittedmodel = fit(x',y',fun,'StartPoint',[15 0 15])
plot(fittedmodel,'r-');
When I run the code I get the following error:
Undefined function 'fit' for input arguments of type 'function_handle'.
How can I fix this?
Thank you.

Answers (1)

Walter Roberson
Walter Roberson on 5 Oct 2013
Which MATLAB version are you using?
Ensure that you have the Curvefitting toolbox installed and licensed. Use
which -all fit
  2 Comments
Jacob
Jacob on 5 Oct 2013
Edited: Walter Roberson on 5 Oct 2013
I'm using version 2013a.
When I use 'which -all fit' I have an output showing that I have the following libraries within my toolbox:
gmdistribution method
ProbDistUnivParam method
NaiveBayes method
Does this mean I'm missing some libraries to use the fit function I would like to use or do I have to readjust my parameters to those methods?

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