Error using syms x: mupadmex,s​ym>cell2re​f,sym>tomu​pad

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Jordan Dion
Jordan Dion 2018-7-23
评论： Walter Roberson 2020-5-9
I used 2018 matlab on my macOS and at some point syms x does not work, it produces errors. I add that this issue persists on my windows 10 pc. I have tried reinstalling, and downgraded to 2017 (currently)
The error produces:
>> syms x
Error using mupadmex
Error in MuPAD command:
Error in sym>cell2ref (line 1308)
S = mupadmex(y);
Error in sym>tomupad (line 1246)
S = cell2ref(numeric2cellstr(x));
Error in sym (line 199)
S.s = tomupad(x);
Error in syms (line 192)
toDefine = sym(zeros(1, 0));
specs:
MATLAB Version: 9.2.0.556344 (R2017a)
MATLAB License Number: STUDENT
Operating System: Mac OS X Version: 10.11.6 Build: 15G22010
Java Version: Java 1.7.0_75-b13 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode
MATLAB Version 9.2 (R2017a)
Simulink Version 8.9 (R2017a)
Control System Toolbox Version 10.2 (R2017a)
DSP System Toolbox Version 9.4 (R2017a)
Image Processing Toolbox Version 10.0 (R2017a)
Instrument Control Toolbox Version 3.11 (R2017a)
Optimization Toolbox Version 7.6 (R2017a)
Signal Processing Toolbox Version 7.4 (R2017a)
Simulink Control Design Version 4.5 (R2017a)
Statistics and Machine Learning Toolbox Version 11.1 (R2017a)
Symbolic Math Toolbox Version 7.2 (R2017a)
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Jordan Dion
Jordan Dion 2018-9-13
I downgraded to 2017a for my mac. It is still not working. However on my PC, I am not sure of the version but it is working. I'll check back later @Xizixiang Wei

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回答（3 个）

Yiqian Qian
Yiqian Qian 2019-8-16
Same problem for MATLAB r2019a on my MBP
Matthew Love
Matthew Love 2019-10-6
Also having this issue
Currently on OS 10.14.6 "Mojave"
Originally booted up Matlab 2017 (cannot remember a or b) and tried to use 'syms' command. Gave me the "mupadex" error. First time I've ever seen that. No issues last time I used it.
Could not find way around it, so I deleted Matlab entirely and upgraded to 2019b, and the issue persists unchanged.
r_avelino
r_avelino 2020-2-11
Same problem here. Can not use syms function.
I am using Matlab2019b in MacOS Catalina 10.15.2
This is what I get in my Matlab Terminal when I try to create the symbolic varible:
>> syms x;
Error using mupadmex
Error in MuPAD command: .
Error in sym>tomupad (line 1250)
S = mupadmex(numeric2cellstr(x));
Error in sym (line 217)
S.s = tomupad(x);
Error in syms (line 232)
defined = sym(zeros(1, length(args)));
It was working properly before but I can not precise when it stoped to work. If I type the command suggested above I get the corresponding adress for the mupadmex.mexmaci64 file.
which -all mupadmex
  2 个评论
Walter Roberson
Walter Roberson 2020-2-11
There is a known problem with using symbolic toolbox with Catalina. My understanding is that it was fixed by one of the updates for R2019b so install the update if you did not do so already.
Earlier MATLAB releases are not supported for Catalina.
r_avelino
r_avelino 2020-2-11
Thanks for the answer Walter. Indeed I updated to Matlab 2019b and the problem with the symbolic variables is fixed

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