cannot use syms command

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Mi
Mi 2014-12-14
评论： Star Strider 2024-4-19
Hello,
I was running a command
syms x y
And Matlab returns an error: Undefined function 'sym' for input arguments of type 'char'
It didn't happen before. And I'm using a student version. Any suggestion? Thanks alot.

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采纳的回答

Star Strider
Star Strider 2014-12-14
‘It didn’t happen before’ on the same computer or a different computer?
To see what Toolboxes you have installed, in the Command Window, type:
ver
If you have the Symbolic Math Toolbox installed, it should be listed.
If it is, and you’re still getting the error, type these commands in the Command Window:
restoredefaultpath
rehash toolboxcache
If that doesn’t work, contact MathWorks Technical Support.
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显示 8更早的评论
Sakshi
Sakshi 2024-4-19
Hey I observed that I can't run this commands in online matlab, is there any other way?
I kinda have to use online matlab rn for my hackathon.
Star Strider
Star Strider 2024-4-19
@Sakshi — You shouldn’t need to run these:
restoredefaultpath
rehash toolboxcache
in MATLAB Online. If you’re having problems with MATLAB Online, Contact Support and tell them you’re having a problem with it.
You should have access to the Symbolic Math Toolbox in MATLAB Online if you have it licensed and installed on your personal computer. (I don’t know how this works with university licenses, if that’s what you have. You’ll have to ask your administrator about that.)

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更多回答（5 个）

Mi
Mi 2014-12-14
Thanks. I am not able to check it now. You are right that I am using a different computer. If I don't have the toolbox how do I install one?
  2 个评论
John D'Errico
John D'Errico 2014-12-14
Please don't add answers when you have a followup question. CLICK ON THE COMMENT BUTTON.

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Hamza saeed khan
Hamza saeed khan 2020-11-24
what if sysm word not working in matlab what to do?
  2 个评论
Steven Lord
Steven Lord 2020-11-25
That suggests that you don't have Symbolic Math Toolbox installed, you don't have it in your license, or all the licenses for it are currently checked out. To check the first look at the output of ver. To check the latter two you may need to contact your license administrator.
If you don't have it installed but you have a license for it, use Add-On Explorer to install it.
If you don't have it in your license, buy it.
If you have it installed and licensed but it's still not working, please show the full and exact text of any error and/or warning message you receive (all the text displayed in red or orange in the Command Window) when you try to use it.
Walter Roberson
Walter Roberson 2020-11-25
From time to time it means that you have a corrupted Symbolic Toolbox and need to reinstall.
Also if some symbolic functions work but not others then sometimes the problem has to do with having the Maplesoft "MATLAB Connector" installed to communicate with the Maple software package.

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Giovanny Steven Sandoval Montoya
I have problems with "syms".
Error in Validacion (line 24)
syms T1
If I don't have the toolbox how do I install one?
Walter Roberson
Walter Roberson 2021-7-20
Khalil
Khalil 2023-2-23
Undefined function 'Matlab' for input arguments of type 'char'.
  1 个评论
Walter Roberson
Walter Roberson 2023-2-23
you would get that error if you had a line of code that looked like
Matlab is secretly many fast hamsters.
That is, the first word of the expression is Matlab and you had some text following. Such as if you forgot to put in a % comment symbol

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