"Undefined function 'equationsToMatrix' for input arguments of type 'sym'." Error

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Ozgur 2015-2-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/179139-undefined-function-equationstomatrix-for-input-arguments-of-type-sym-error

回答： Ozgur 2015-2-19

Hello all,

I've been trying to deal with the equationsToMatrix function, but getting this "Undefined function 'equationsToMatrix' for input arguments of type 'sym'." error all the time.

To try, I took a sample code from Help. It gives the same error also.

syms x y z
[A,b] = equationsToMatrix([x+y-2*z==0,x+y+z==1,2*y-z+5==0], [x,y,z])

Any ideas? Version is 2014b.

BR, Ozgur

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Answer 1

Ozgur 2015-2-19

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/179139-undefined-function-equationstomatrix-for-input-arguments-of-type-sym-error#answer_168539

I think this is related to couple of issues combined. MATLAB was on E:\ drive, I'd uninstalled and installed it again on C:\.

I've made toolbox path cache update afterwards. Now it is working.

P.S.: After posting this question, I realized that most of the symbolic functions gone crazy. This problem is not directly related to equationsToMatrix function.

Thanks for the replies.

Ozgur