Matlab command window doesn't work

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BerlinM
BerlinM on 5 Feb 2016
Hi, my Matlab Command window doesn't work. The two arrows right next to the fx are missing. If I type in something trivial like "a=3" nothing happens. I jump in to the next row but nothing happens. Please help me!
Here is a picture of what i mean.
  13 Comments
Pavel Krupets
Pavel Krupets on 11 Nov 2022
same for me, command window sometimes doesn't work and text is typed into editor window.
clicking with mouse on command window doesn't help
sometimes pressing CTRL+C helps, sometimes it doesn't
sometimes clearning history in command window helps

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Answers (10)

Emily Garvin
Emily Garvin on 10 Oct 2018
Hi. It sometimes simply happens to me when I forget to end a if/for/while statement. In this case I was unable to solve the problem by restarting the program. All I had to do was type "end" or type a closing bracket, even after reopening the program. :)
  3 Comments
Rik
Rik on 18 Sep 2020
Comment posted as flag by Xianyao Liu:
You are right! Thx

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Senthil Vikram Vodapalli
Senthil Vikram Vodapalli on 27 Nov 2020
Try Ctrl + C, it worked for me

Steven Lord
Steven Lord on 5 Feb 2016
Show the lower-right corner of the Command Window. Does it say something like "Initializing" or "Busy" there?
If it shows "Initializing", how long has it been initializing? How long since you started MATLAB?
If it shows "Busy", MATLAB is running some code. Depending on what that code is doing, it may take a while and you won't be able to execute other commands while that code is running. You can type ahead but they won't get executed until MATLAB has finished its current work.
  3 Comments

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Komal Gupta
Komal Gupta on 14 Oct 2018
Exactly the same happened with me...n i typed an end and its resolved ...it works.

the cyclist
the cyclist on 5 Feb 2016
You aren't really giving us much info here besides the core problem. Has it been working, and suddenly stopped? Or is this the first time you've used MATLAB?
Have you tried the obvious things like restarting MATLAB? Restarting your computer?
Have you changed anything significant on your computer before/after this problem?
This seems like a problem we might struggle to diagnose with you. You might want to contact Mathwork support.
  4 Comments
shashank paunikar
shashank paunikar on 9 Apr 2019
may be its because of windows 10/8 issues.
Windows activation is required to solve the issue.
i have the activate windows problem 1 year of genuine term was over

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Eric Smith
Eric Smith on 11 Jan 2018
I had the same problem, but restarting the program worked for me. What was absent for me before when it wasn't working (and appears to be absent in yours) is the two right facing carrots on the command line. I've just started using the program but if someone with more experience could pinpoint why those might disappear, that would most likely fix the problem.

Eliot Mayer
Eliot Mayer on 23 Jan 2018
> ... What was absent for me before when it wasn't working (and appears to be absent in yours) is the two right facing carrots on the command line.
Sorry, I don't have an answer. I just want to report that I have been having the same problem lately with Matlab R2017b, running on Windows 7. I am not new to Matlab or R2017b, but the problem seems to be happening daily for the past few days. The problem is intermittent.
When the problem arises, I don't have that command prompt, and yet Matlab is not "dead". For example, I can still click on the tabs in the Editor window and view the code from the open functions. I can even edit and save those functions. I can undock and dock the Command Window (but the >> prompt is missing either way). I can type in the command window, but it dot respond.
The problem shows up when running my code. I can force Matlab to close. When I restart Matlab, I can run the same code without problem, so I don't suspect coding problems such as endless loops. Even if that was a problem, I would think the Pausing button would give back control, but it does not.
One clue: When I click the X to close Matlab, I get a message "An operation is in progress". I give it a chance to try to stop the operation, but that does not work. Then I click End Now. I just did this, re-started Matlab, and ran the same code that "got stuck". It ran normally again, completing in about 10 seconds.
  5 Comments
Jesse Grooten
Jesse Grooten on 14 Feb 2019
Edited: Jesse Grooten on 14 Feb 2019
I have the exact same problem using Matlab R2018b.
I can exec code just fine in the command window, when suddenly it stops working. The arrows next to the Fx dissapear and Run button greys out. I have the feeling I'm accidentally pressing a shortkey on my keyboard to turn it off, otherwise I have no idea why it keeps happening. I've used Matlab 3 times now and it's happened to me 3 times as well (every session once).
Restarting the program fixes the problem temporarily for me.
I do not use Microsoft One drive and the command prompt doesn't say initializing or busy either.
UPDATE:
Emily Garvins answer worked for me.
"Hi. It sometimes simply happens to me when I forget to end a if/for/while statement. In this case I was unable to solve the problem by restarting the program. All I had to do was type "end" or type a closing bracket, even after reopening the program. :)"

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Jay Kirsch
Jay Kirsch on 20 Dec 2021
I am having the same problem, but...
Rebooting the laptop does not fix the problem. Nor does just restarting MATLAB.
Installing a newer MATLAB does not fix the problem! It suddenly started happening on 2020b, so I installed 2021b but that didn't resolve it.
Typing end or CTRL-C does not fix the problem.
I recently was having issues with MS Office, so I updated to O365. Is there some dependence on Excel???

Ilyes younsi
Ilyes younsi on 27 Jan 2022
Hi
I am new in Matlab. How open an example in Matlalb . Example
DDE with Constant Delays
  1 Comment
Walter Roberson
Walter Roberson on 17 Sep 2022
At the top right of that example https://www.mathworks.com/help/matlab/math/dde-with-constant-delays.html you can click on "Copy command", and then you paste the command at your MATLAB command prompt.
If you are using an earlier version of MATLAB, the exact wording might be a bit different.
If you are using a sufficiently early version of MATLAB, there might not be a quick way to copy the example.

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Muhammad Rezaul Hasan
Muhammad Rezaul Hasan on 17 Sep 2022
NO SOLUTION WORKED FOR ME .
  1 Comment
Steven Lord
Steven Lord on 18 Sep 2022
In that case please contact Technical Support using the Contact Support link under the Get Support heading at the end of this page and work with the Support staff to determine why the MATLAB Command Window is not working on your computer.

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