The specified superclass 'symbolic.mixin.abstractsize' contains a parse error ...
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When I type in "syms var", I get the error "The specified superclass 'symbolic.mixin.abstractsize' contains a parse error"... I have tried the solutions I found online to see what the conflicting function might be and I cannot find it. "which -all syms" gives the result:
/Applications/MATLAB_R2023b.app/toolbox/symbolic/symbolic/syms.m
When I do a "dbstop error", it stops on line 231, which is: "defined = sym(zeros(1, length(args)));". I type in "which -all sym" and I get the result:
/Applications/MATLAB_R2023b.app/toolbox/symbolic/symbolic/@sym/sym.m
So, the functions exist, appear to be unique, but give errors. "sym" is a classdef that appears to depend on "matlab.mixin.CustomCompactDisplayProvider". When I search for that, I get: "/Applications/MATLAB_R2023b.app/toolbox/matlab/lang/+matlab/+mixin/CustomCompactDisplayProvider.m". It also seems to depend on "symbolic.mixin.abstractsize". When I search for that, via: "which -all symbolic.mixin.abstratctsize", I get "'symbolic.mixin.abstractsize' not found." The file does indeed exist as:
/Applications/MATLAB_R2023b.app/toolbox/symbolic/symbolic/+symbolic/+mixin/@abstractsize/abstractsize.m
But even when I add the symbolic folder to my path via addpath(genpath('/Applications/MATLAB_R2023b.app/toolbox/symbolic/')), I get the same error.
Any advice? (I'm reporting this for R2023b, but I have had the problem with prior releases also and am finally getting around to asking for help).
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Shree Charan M L
am 19 Okt. 2023
Bearbeitet: Shree Charan M L
am 19 Okt. 2023
Hi Gregory,
I understand that you are not able to use the ‘syms var’ command.
Here are some things you could do that might resolve the issue:
1) Verify symbolic toolbox installation: Go to MATLAB Home Tab, select “Add-Ons” > “Manage Add-Ons” and double-check whether Symbolic Math Toolbox is installed correctly.
2) Clear MATLAB cache: Sometimes, MATLAB's cache can cause conflicts or errors. Try clearing the MATLAB cache. The following code snippet does this for you:
clear all
rehash toolbox
rehash toolboxcache
3) Check for conflicting functions: It is possible that there may be conflicts with other functions. Check if you have any user-defined functions or variables with the same name as the symbolic functions.
You may also find this MATLAB Answers article helpful: https://www.mathworks.com/matlabcentral/answers/100888-why-do-i-receive-an-unrecognized-function-or-variable-error-when-trying-to-use-a-built-in-function
Hope this helps and resolves the error “The specified superclass 'symbolic. mixin.abstaractsize' contains a parse error”
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