Error in Constraining Symbolic Variables

Question

Matthew 2011-1-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/474-error-in-constraining-symbolic-variables

采纳的回答： Walter Roberson

在 MATLAB Online 中打开

I'm having trouble constraining a symbolic variable to a specific set of numbers.

Example:

(input)

>> syms k positive

will result in (output)

??? Error using ==> mupadinit at 35
    Unable to initialize kernel
Error in ==> mupadengine.mupadengine>mupadengine.evalin at 117
                    [res,status] = mupadmex(statement,8);
Error in ==> mupadeval at 18
            result = evalin(symengine,statement,'char');
Error in ==> sym.sym>sym.sym/assumptions at 619
                            mupadeval(['assume(' s ' > 0):']);
Error in ==> sym.sym>sym.sym/symchar at 203
                            assumptions(x,a);  
Error in ==> sym.sym>sym.sym at 120
                    S = cell2sym(S,symchar(x,a,nargin));

I have also tried entering this as k=sym('k','positive') to the same effect. I don't understand why this is happening. Also, inputting the command "clear all" has the following effect.

>> clear all
Warning: The following error was caught while executing 'mupadengine' class destructor:
Error using ==> mupadinit at 35
Unable to initialize kernel

I am worried the code may be corrupted for some reason. If someone could provide insight into my issue or help me correct it, I would be greatly appreciative.

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Oleg Komarov 2011-1-27

Can you post more code? Like what you do before trying to constrain them?

Matthew 2011-1-27

There's not anything else before that, I just want to create a variable and constrain it to a certain number set and it keeps giving me errors back to either "mupadengine" or "symengine".

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