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I tried all day to run my code syms R t; eqn = R*tan(10022.99039*R)-(6.97964*10^-3*sqrt(t))/R==0 ; m = linspace(10,20,1) ; sol = zeros(size(t)) ; for i =1 :length(m) eqn = subs(eqn,t,m(i)) ; sol(i) = double(solve(eqn,R)) ; end plot(m,sol)
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alburary daniel
el 10 de Jun. de 2018
Cerrada: alburary daniel
el 13 de Jun. de 2018
this is my code
syms R t;
eqn = R*tan(10022.99039*R)-(6.97964*10^-3*sqrt(t))/R==0 ;
m = linspace(10,20,1) ;
sol = zeros(size(t)) ;
for i =1 :length(m)
eqn = subs(eqn,t,m(i)) ;
sol(i) = double(solve(eqn,R)) ;
end
plot(m,sol)
But when I running matlab give me the following issues
Error using mupadmex
Internal error with symbolic engine. Quit and restart MATLAB.
Error in sym>cell2ref (line 1303)
S = mupadmex(y);
Error in sym>tomupad (line 1241)
S = cell2ref(numeric2cellstr(x));
Error in sym (line 215)
S.s = tomupad(x);
Error in syms (line 197)
toDefine = sym(zeros(1, 0));
Error in SOLUCION1 (line 3)
syms R t;
any suggetion?
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Respuesta aceptada
Ameer Hamza
el 10 de Jun. de 2018
It seems that there is some problem with symbolic math toolbox. If you are using R2017b or R2018a on windows 10 then you might try this recent update: https://www.mathworks.com/support/bugreports/1755918.
3 comentarios
Ameer Hamza
el 12 de Jun. de 2018
You are getting this warning because the analytical solution of this equation does not exist. In this non-linear equation, you cannot write a closed form solution of the form
R = f(t)
where f is an analytical function. Therefore, MATLAB gives this warning and return a numeric solution instead.
Walter Roberson
el 12 de Jun. de 2018
There are an infinite number of solutions. The normal value of the function is about -1E47, so you only get a zero of the function when tan(10022.99039*R) approaches infinity close enough to overcome the -1E47. The function is highly non-linear there, so finding the correct value is difficult.
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