(48G 49G 50G) RungeKutta Diff Eqn solver

07162021, 08:05 PM
Post: #19




RE: (48G 49G 50G) RungeKutta Diff Eqn solver
I have to agree with rcthacker about the "utility of the RKF solver".
I ran into this same issue some 20 odd years ago. The example in the HP 48G Series User's Guide showed the solution for a 2nd order differential equation with a VectorMatrix equation. This works OK for Linear 2nd order differential equations or for a Linear System of 1st order differential equations. And even then within the SOLVE application  Differential Equations section. Nowhere in any of the various books published for the 28 or 48s was an example given of solving a nonlinear 2nd order differential equation by way of using a program object. On the other hand, I have not check to see how using VectorMatrix equation on the 50G which allows for symbolic matrices might work. John 

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