Why do I get an error with the fit function even though I'm following at MATLAB tutorial?

I am trying to learn how to use the fit function by using the following example code from MATLAB:

x = (0:0.2:5)';
y = 2*exp(-0.2*x) + 0.1*randn(size(x));
f = fit(x,y,'exp1')

However, I keep receiving this error message:

Check for missing argument or incorrect argument
data type in call to function 'fit'.

Error in test (line 3)
f = fit(x,y,'exp1')

I am almost 100% sure the code works fine, so I think something else is causing this. Is the fit function outdated? Based on the error message, I would think that there might be another copy of fit.m on my computer that I am unaware of, but I couldn't find anything. Thanks!

Answer 1

[Kevin Yeung]

I figured it out! I simply forgot to install the Curve Fitting Toolbox. Thanks anyways!

Answer 2

[madhan ravi]

Works fine for me. Probably you made a custom file fit.m .

 which fit -all % what does it show?

[Kevin Yeung]

This comes up:

C:\Program Files\MATLAB\R2020a\toolbox\stats\stats\@gmdistribution\fit.m  % gmdistribution method