Error with dee command

Good afternoon,

I can't understand why Matlab shows me this message: "Unrecognized function or variable 'dee' ".

I've got Simulink and it works, but when I write dee in the command window in order to work with the differential equation editor Matlab shows me this error.

What can I do?

Thank you

Answer 1

[Prabhan Purwar]

Hi,

The command is not recognized by the system because this tool has been deprecated as of MATLAB R2020a. However, it is possible to use it by copying the necessary files (attached as a compressed folder) to the MATLAB path.

Thanks.

[Arun Tangirala]

Hi Prabhan,

This is an unfortunate decision on part of MathWorks especially without providing an alternative editor (I was told about this by MathWorks in an early meeting this year). I found it highly useful in my undergraduate course on control and in all research problems where we simulate non-linear ODEs. When you say "copying the necessary files" are you referring to the files of DEE (from an older version)? If so, where can I find them in an older version.

Thank you.

[Arun Tangirala]

Found the files and copied. It worked. Thank you for the very useful tip.

[Tobias Goebels]

Hi Prabhan,

Unfortunately, I am facing the same problem as Arun but I don't have an older version from Matlab where I could take the files from. In your answer you wrote about the files beeing attached as a compressed folder, but where can I find it?

Could you maybe explain where to find it or upload it a second time if they maybe were deleted in the mean time.

Thank you.

[Prabhan Purwar]

Kindly have a look at the following attached files.

Hope it helps!!

[Tobias Goebels]

Thank you very much for your quick reply. Now the next question is: To which of the Matlab installation subfolders do I have to copy the files?

[Tobias Goebels]

A colleague who is using version 2018b told me, that the dee folder is located at \MATLAB\'version'\toolbox\simulink\dee

I copied the files there but unfortunately the DEE still does not open and I only get the error I got before. Do I have to include this new folder somehow in Matlab and "tell" Simulink that (and where) it is available?

[Tobias Goebels]

Sorry for asking again, no idea where exactly the files have to be copied or included?

[Stefanie Schwarz]

You can unzip the dee.zip archive anywhere on your machine. Then, place the bottom folder 'dee' on the MATLAB path as shown below:

After that, run the command 'savepath' to save the setting permanently.

Answer 2

[Stefanie Schwarz]

Please see the following MATLAB Answers post:

https://www.mathworks.com/matlabcentral/answers/622843-how-can-i-use-the-differential-equations-editor-dee-with-matlab-r2020a-and-later