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How can I use the Differential Equations Editor (dee) with MATLAB R2020a and later?

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I am trying to use the Differential Equations Editor which was presented in the following Simulink blog post:
However, if I enter the command "dee" in MATLAB R2020a, the command is not recognized and the model doesn't open. What happened to Differential Equations Editor, and how can I use it in R2020a or later?
>> dee
Unrecognized function or variable 'dee'.

Accepted Answer

MathWorks Support Team
MathWorks Support Team on 22 Oct 2020
Differential Equations Editor is an obsolete, undocumented tool that has been removed as of MATLAB R2020a.
Attached to this post is a "" archive that contains the last working version of the tool. To permanently add it to your MATLAB installation, add the "dee" folder to your MATLAB path as follows:
>> addpath('C:\path\to\dee\')
>> savepath

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