Question

for theta=1:10
  x_3 = cos(theta);

  syms x;
  x_2 = 'x_3 - cos(x+theta)';

  a = solve(x_2,x)
end

When I run this code, the solutions for a include x_3 and theta instead of substituting them with the values defined above. How can I solve this using the actual values of x_3 and theta?

Answer 1

It is a problem of mixing syms and strings?

Try:

syms x;
for theta = 1:10
    x_3 = cos(theta);
    x_2 = x_3 - cos(x+theta);
    a = solve(x_2,x)
end

or

for theta = 1:10
    x_3 = cos(theta);
    x_2 = 'x_3 - cos(x+theta)';
    a = solve(x_2,'x')
end