why do I see error in curve fitting?

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MP
MP 2021-12-16
评论： Walter Roberson 2021-12-17
What I try to run the below example given under the link : https://in.mathworks.com/help/curvefit/fit.html
clear; close all; clc;
load census;
f=fit(cdate,pop,'poly2');
plot(f,cdate,pop);
it throws following error...
Unable to resolve the name curvefit.attention.Error.
Error in fit>iCreateErrorFunction (line 631)
errorFcn = curvefit.attention.Error();
Error in fit (line 107)
errorFcn = iCreateErrorFunction( nargout > 4 );
Can anyone please help?
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MP
MP 2021-12-16
>> which fit
C:\Program Files\MATLAB\R2021a\toolbox\curvefit\curvefit\fit.m
MP
MP 2021-12-16
The curve fitting toolbox is located at C:\Program Files\MATLAB\R2021a\toolbox\curvefit\curvefit\fit.m
still it gives following error.
Error using cfit
'fittype' requires Curve Fitting Toolbox.
Error in fit>iFit (line 128)
fitobj = cfit;
Error in fit (line 116)
[fitobj, goodness, output, convmsg] = iFit( xdatain, ydatain, fittypeobj, ...

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Walter Roberson
Walter Roberson 2021-12-16
The Curve Fitting Toolbox needs to be reinstalled.
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MP
MP 2021-12-17
编辑：MP 2021-12-17
Thank you for the clarification..
How about the other way round? I have 2017 matlab too.. Can I Copy-Paste 2017 toolbox to 2021 matlab folder and then add to 2021matlab path?
Walter Roberson
Walter Roberson 2021-12-17
It is possible for that message to show up if you have the Curve Fitting Toolbox installed, but somehow do not have a license to use it.
For individual licenses, it is typically only possible to install toolboxes you have a license for, but there are some situations in which it is possible.

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