Matlab doesn't open (it's installed and activated)

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Abhimanyu Talwar
Abhimanyu Talwar 2019-3-20
评论： Massimo Del Guasta 2025-2-18，12:04
I'm on a Windows 10 machine. I had a well functioning Matlab 2018a installed and then suddenly it stopped working. When I try to open Matlab, it shows up in my Task Manager but the software just doesn't open.
I uninstalled 2018a, downloaded and installed 2018b and activated it, but it still shows the same behavior.
Can someone please help me? I've wasted hours of effort on this and can't make it work.
Thanks
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采纳的回答

Kojiro Saito
Kojiro Saito 2019-3-20
编辑：Kojiro Saito 2019-10-14
It might be because MATLAB's prefdir is corrupted.
Please delete the following folders (previous prefdir)
  • C:\Users\YOUR_USER_NAME\AppData\Roaming\MathWorks\MATLAB\R2018a
  • C:\Users\YOUR_USER_NAME\AppData\Roaming\MathWorks\MATLAB\R2018a_licenses
  • C:\Users\YOUR_USER_NAME\AppData\Roaming\MathWorks\MATLAB\R2018b
  • C:\Users\YOUR_USER_NAME\AppData\Roaming\MathWorks\MATLAB\R2018b_licenses
and launch MATLAB R2018b again.
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Rohit Singh
Rohit Singh 2024-11-15
编辑：Rohit Singh 2024-11-15
what is the default prefdir for windows? i reactivated my matlab license but still can't open a matlab file. it still shows error
Massimo Del Guasta
Massimo Del Guasta 2025-2-18，12:04
thank You! your suggested solution worked also for my MATLAB 2023b!

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更多回答（4 个）

NN
NN 2021-6-9
I am facing teh same problem, but i couldnt find the APP data folder
  1 个评论
Ravi Gangani
Ravi Gangani 2021-10-15
'APP data folder ' is hidden forlder . you have enable 'show hidden folder' from folder option.

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Ashenafi Tesfaye
Ashenafi Tesfaye 2023-8-10
These are some of the methods.
  1. Restart your computer and launch MATLAB again.
  2. Go to task manager and end the process if it is running without opening and displaying on the screen.
  3. Delete the temporary files
  4. Delete the AppData/Roaming/Mathworks/R20xxx.
All above listed ways could work but the 4th method is so effective.
That is it.
  1 个评论
Sen
Sen 2025-1-27，7:59
Method 4 works, but simply delete the 'AppData/Roaming/Mathworks/R20xxx.' does not work for me.
In my laptop,
  • First, rename this folder e.g R2024a to R2024a_old. (not delete)
  • Then, it works.

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Harry
Harry 2023-11-14
I am having the same issue, but none of the solutions above help... What else can I try?
Suryansh
Suryansh 2024-2-26
Hi, it is not helping
  1 个评论
Steven Lord
Steven Lord 2024-2-26
Please contact Customer Service directly using this link and work with them to determine why MATLAB will not open on your machine.

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