MATLAB generates errors using 'mupadmex' and 'symengine' when executing bernoulli() commands.

Question

Michael Ransom 2018-7-28

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/412535-matlab-generates-errors-using-mupadmex-and-symengine-when-executing-bernoulli-commands

回答： Michael Ransom 2018-7-28

I require the evaluation of certain Bernoulli polynomials for a Rayleigh-Bloch wave project. However, as an example, when I execute:

bernoulli( 0:2:10 ) ;

or

bernoulli( 1 , pi ) ;

I get this error message as follows:

Error using mupadmex
Internal error with symbolic engine. Quit and restart MATLAB.
Error in symengine
Error in sym (line 185)
        symengine;
Error in sympref>implementedSymprefs (line 142)
   y = {'FourierParameters', sym([1,-1]), 'MuPAD', 'sym';...
Error in sympref (line 81)
  iSymprefs = implementedSymprefs;
Error in digits (line 15)
    r = eval(mupadmex('DIGITS',0));
Error in sym.useSymForNumeric (line 157)
          oldDigits = digits(16);
Error in double/bernoulli (line 14)
Y = sym.useSymForNumeric(@bernoulli, varargin{:});
Warning: Failed to initialize symbolic preferences. 
> In digits (line 15)
  In sym.useSymForNumeric (line 157)
  In double/bernoulli (line 14) 
Error using mupadmex
Internal error with symbolic engine. Quit and restart MATLAB.
Error in digits (line 15)
    r = eval(mupadmex('DIGITS',0));
Error in sym.useSymForNumeric (line 157)
          oldDigits = digits(16);
Error in double/bernoulli (line 14)
Y = sym.useSymForNumeric(@bernoulli, varargin{:});

I have reinstalled MATLAB as a first port of call, but executing the same commands afterwards only repeated the same errors. Honestly, I have no idea what any of this error means, nor how I could go about fixing it. What's wrong with it? Better still, how do I fix it?