??? Error: Unexpected MATLAB operator.
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XIONG Qingxiang
el 10 de Jul. de 2019
Comentada: XIONG Qingxiang
el 10 de Jul. de 2019
Hello everyone,
I'm cofused by this problem for several days. here is the error message:
??? Error: Unexpected MATLAB operator.
Error in ==> sym.eval at 15
s = evalin('caller',vectorize(map2mat(char(x))));
Error in ==> test_nmt_m2 at 80
J1 = eval(feval(symengine,'numeric::int',f4,'r=lower3..upper3')) + ...
Here is the code which producing the error:
J1 = eval(feval(symengine,'numeric::int',f4,'r=lower3..upper3')) + ...
eval(feval(symengine,'numeric::int',f2,'r=lower1..upper1')) + ...
eval(feval(symengine,'numeric::int',f3,'r=lower5..upper5')) + ...
eval(feval(symengine,'numeric::int',f4,'r=lower2..upper2'));
Thanks in advance if anybody can solve this problem.
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Respuesta aceptada
Walter Roberson
el 10 de Jul. de 2019
Never eval() a symbolic expression. The language they use is not MATLAB and is not mupad.
I suspect that numeric integration is failing for you, returning back an unevaluated numeric::int form.
3 comentarios
Walter Roberson
el 10 de Jul. de 2019
vpaintegral()
However any numeric integral can fail as the code can detect no convergence to within available numeric accuracy. Numeric integration across a singularity is not any more possible than theoretical integration across the singularity.
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