solving a differential equation coupling together in matrix and vector form with ode45
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I have two problem:
1) I used two functions for solving a set of equation not in matrix or vector form but like
[x(2);3+x(4)+x(3);x(4);....................]
then [t,x] = ode45(@(t,x) lili(t,x),tspan,x0);
now I need the vector of dx=[x(2) x(4) x(6)]
but it doesnt return this vector.
2) i want to solve equation like this D2y=d2x+cross(m,n)
its clear cross product is in matrix form
how could i solve matrix form of differential equation?
especially initial values is a vector
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