MATLAB: The answer is like that

resultsolve

syms x
s = vpa(solve((0.5)==(log(5)*log10(8)*sinh(x))/(atan(0.5)*(3^(1/5))*abs(cos(2*pi/3))*exp(cos(2*pi/3))),x))

the correct result of this equation is 0,06 but when i run this command matlab gives me this

s =
                                          0.060219526083180976165227748603359
   - 0.060219526083180976165227748603359 + 3.1415926535897932384626433832795i

So, why i found this result and how can i found just " 0,06 " ?

Thank you

Best Answer

0.06 is not a solution to that equation. If you substitute 0.06 for x you get

0.5 == 0.49817509413836472619769716883263

which is false.

The exact solution is asinh((3^(1/5)*atan(1/2)*exp(-1/2)*log(10))/(4*log(5)*log(8)))

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MATLAB: Subscripted assignment dimension mismatch.(matrices)

It looks like N is a 4x4 matrix, and you are trying to assign it to just one position of J.

It is difficult to know what was intended here, instead of

for i=1:4
for j=1:4
J(i,j) = J(i,j) + N
end
end

maybe it should just be

J = J + N

That is just a pure guess, based on the size of the matrices.

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theta(1)=0.05;
for n=2:40
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end

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