why does matlab tell me that the "chop" command doesn't exist?
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Bodo Christian
on 28 Mar 2020
Commented: Bodo Christian
on 29 Mar 2020
why does matlab tell me that the chop command doesn't exist?
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Accepted Answer
per isakson
on 28 Mar 2020
Edited: per isakson
on 28 Mar 2020
Make sure that you have the Control System Toolbox. chop() is a function in that toolbox.
>> product_info = ver('control')
product_info =
struct with fields:
Name: 'Control System Toolbox'
Version: '10.5'
Release: '(R2018b)'
Date: '24-May-2018'
>>
Maybe chop() is removed. It was obsolete in R2018b.
>> which chop -all
C:\Program Files\MATLAB\R2018b\toolbox\control\ctrlobsolete\chop.m
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Walter Roberson
on 29 Mar 2020
https://www.mathworks.com/matlabcentral/answers/101885-how-do-i-install-additional-toolboxes-into-an-existing-installation-of-matlab
Note that you will need to be licensed for the toolbox.
You should also have a look at the round() call and consider what behavior you need. For example if you have chop(1.2468,2) do you want 1.25 or do you want (the closest representable number to) 1.24?
More Answers (2)
Walter Roberson
on 28 Mar 2020
MATLAB does not contain any chop() function, unless it is a method for some object that I cannot think of at the moment.
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Steven Lord
on 28 Mar 2020
Cleve's original version of MATLAB had a chop command as you can see from the user's guide, but I'm not sure there is such a command in any MathWorks product right now. Did you perhaps want to use Professor Nick Higham's File Exchange submission? If so you'll need to install that add-on -- the easiest way to do that is to use Add-On Explorer.
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