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Symbolic Vector ODE numerical solution

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Leonardo Dipilato
Leonardo Dipilato on 14 Jun 2020
Commented: Walter Roberson on 15 Jun 2020
I'm trying to solve an ODE using vectorized symbolic calculus.
N = 4;
syms theta(t) [1 N]
Q = tril(ones(N));
theta = theta*Q';
eq = diff(theta, t, t) - cos(theta);
Dt = diff(theta, t);
How can I use this with ode45 or other solvers?

  1 Comment

Walter Roberson
Walter Roberson on 15 Jun 2020
To use that with ode45 or similar, I recommend reading the first example for odeFunction() as it shows the steps to use to prepare symbolic differential equations for use with ode45 or similar.

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Answers (1)

Paresh yeole
Paresh yeole on 14 Jun 2020
in your equation for 'eq', if you are looking for double differentiation then it should be
eq = diff(theta, t, 2) - cos(theta);

  1 Comment

Walter Roberson
Walter Roberson on 14 Jun 2020
diff(theta, t, 2) and diff(theta, t, t) are treated the same, both become diff(theta, t, t) on output.

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