Undefined function 'fit' for input arguments of type 'double'.

I have already downloaded curve fitting toolbox

as when i type

which fit

is returned

C:\Program Files\MATLAB\R2019b\toolbox\stats\stats\@gmdistribution\fit.m % gmdistribution method

but when i am trying to implement 'fit' function even in the following simple exampe i have an error

x=[1;4;10];
y=[2;4;6];
a=fit(x,y,'poly1');

and the error i have is:

>> Untitled

Undefined function 'fit' for input arguments of type

'double'.

Error in Untitled (line 3)

a=fit(x,y,'poly1');

Answer 1

[madhan ravi]

You don’t have the license for it.

[Georgios Tsimplis]

Thank you for your response.

So what should i do?

[Georgios Tsimplis]

I have the license because i type

ver % in command window , check whether you have Statistics and Machine Learning Toolbox
license('checkout','Curve_Fitting_Toolbox') % if it returns 1 then you have a valid license

and i have back

ans =

1

[madhan ravi]

 >> which fit -all
/MATLAB/toolbox/curvefit/curvefit/fit.m
/MATLAB/toolbox/stats/stats/@gmdistribution/fit.m  % gmdistribution method

[madhan ravi]

Seems like you don’t have the “Curve Fitting Toolbox” .

[Georgios Tsimplis]

Yeah but why is this happening to me..?

what should i do?

i am a univesity student and i can download the full version of matlab 2020a..should i do something like this?

[madhan ravi]

Go to Adds-On and download the toolbox from there.