MATLAB Answers

Matlab command window doesn't work

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BerlinM
BerlinM on 5 Feb 2016
Commented: konda ravali on 25 Jul 2019
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.

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PARESH RAJPUT
PARESH RAJPUT on 19 Jun 2017
I have the same problem, please suggest some solution.
Chanel Smith
Chanel Smith on 12 Jul 2019
I figured it out. Type the arrows (>>) in manually followed by any command or function and hit enter. It won't execute but the command window will start working again and the arrows will return.
konda ravali
konda ravali on 25 Jul 2019
it didn't workout,does anyone has any other solution?

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Answers (6)

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. :)

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Jesse Grooten
Jesse Grooten on 14 Feb 2019
This works for me! Thanks a lot.
It doesn't work for this however.
When I for example put this into the command window:
"x = randi([1,6],1);
while(x ~= 6)
end"
The problem occurs as well. It'll say "an operation is in progress" and it won't stop.
Typing an extra end or two won't do anything. I still have to restart the program.

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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.

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BerlinM
BerlinM on 5 Feb 2016
One step forward: It shows Initializing the whole time (for 5 minutes now).
Thank you, what can I do?
Steven Lord
Steven Lord on 11 Jan 2018
If MATLAB is taking a long time to initialize and start up, try the steps in this Answer. If none of those resolve the problem, you should probably contact Technical Support using the Contact Us link in the upper-right corner of this page and work with the Support staff to diagnose why initialization is taking a long time.

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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.

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Walter Roberson
Walter Roberson on 5 Feb 2016
Do you have a startup.m in your C:\Users\S\Documents\MATLAB or in your MATLAB preferences directory ? If you do then remove them.
BerlinM
BerlinM on 5 Feb 2016
Yes, I found it in the preference directory and I removed it. But it didn't solve my problem.
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.

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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.

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Walter Roberson
Walter Roberson on 11 Oct 2018
There was an issue with Microsoft OneDrive that had automatic download turned on; it was an interaction between MATLAB and a Microsoft change. It affect R2017b; I do not recall at the moment if it also affected R2017a. There was, if I recall, a patch for it for the affected release, and was fixed in the next release of MATLAB.
Eliot Mayer
Eliot Mayer on 11 Oct 2018
Thanks, Walter. I have been procrastinating about updating Matlab but you just inspired me to do it.
Jesse Grooten
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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Komal Gupta
Komal Gupta on 14 Oct 2018
Exactly the same happened with me...n i typed an end and its resolved ...it works.

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