Is the "smooth" function no longer supported in 2018b?

Just updated to 2018b, from 2018a, and made sure all the toolboxes I had were downloaded too.

Ran a script that I've been working on that uses the "smooth" function, however it is no longer working and throwing the error:

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

Is the smooth function no longer supported in the latest update? How can I get around this? The line of code that was working is:

 start_filtered=smooth(start,150);

where start is a column vector.

Thanks.

Answer 1

[Stephen23]

smooth is in the Curve Fitting Toolbox.

Do you have the Curve Fitting Toolbox installed, and a current license for it? Check what is installed:

ver

and check your licenses:

https://www.mathworks.com/matlabcentral/answers/285496-how-do-i-view-what-toolboxes-i-have-for-my-license#answer_223183

https://www.mathworks.com/matlabcentral/answers/97495-how-can-i-test-the-license-for-a-toolbox-in-matlab

[Jed Abanat]

No I don't have this toolbox. This is weird because the smooth function is still working in 2018a...

MATLAB                                                Version 9.5         (R2018b)
Control System Toolbox                                Version 10.5        (R2018b)
Image Processing Toolbox                              Version 10.3        (R2018b)
Parallel Computing Toolbox                            Version 6.13        (R2018b)
Robust Control Toolbox                                Version 6.5         (R2018b)
Statistics and Machine Learning Toolbox               Version 11.4        (R2018b)

[Walter Roberson]

>> which -all smooth
/Applications/MATLAB_R2018a.app/toolbox/curvefit/curvefit/smooth.m
/Applications/MATLAB_R2018a.app/toolbox/econ/econ/@dssm/smooth.m        % dssm method
/Applications/MATLAB_R2018a.app/toolbox/econ/econ/@ssm/smooth.m         % ssm method
/Applications/MATLAB_R2018a.app/toolbox/econ/econ/@statespace/smooth.m  % statespace method

So it is the Curve Fitting Toolbox in R2018a.

[Jed Abanat]

So looks like they've removed it in 2018b... Well I guess I'll continue using 2018a. Thanks!

[Walter Roberson]

Removed it? No.

>> which -all smooth
/Applications/MATLAB_R2018b.app/toolbox/curvefit/curvefit/smooth.m
/Applications/MATLAB_R2018b.app/toolbox/econ/econ/@dssm/smooth.m        % dssm method
/Applications/MATLAB_R2018b.app/toolbox/econ/econ/@ssm/smooth.m         % ssm method
/Applications/MATLAB_R2018b.app/toolbox/econ/econ/@statespace/smooth.m  % statespace method

Exactly the same list of functions and methods.

In your R2018a version you should check with

which -all smooth

and see what you come up with. Possibly you are using smooth() from a File Exchange contribution or third-party toolbox.

[Jed Abanat]

Well looks like it's gone for me:

2018a

>> which -all smooth
E:\Program Files\MATLAB\R2018a\toolbox\curvefit\curvefit\smooth.m

2018b

>> which -all smooth
'smooth' not found

[Walter Roberson]

Is Curvefitting toolbox definitely installed, according to ver?

You might need to reinstall the toolbox.