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

06152021, 09:09 PM
Post: #17




RE: 48G50G RungeKutta Diff Eqn solver
HP Solve doesn't solve DEs numerically. RungeKutta integrates along the unknown function trajectory. HP Solve finds roots of expressions. Not the same. I was interested in Vfinal and Sfinal when
V' = 9.8  0.005 V^2 m/s^2 for T0 = V0 = 0.0 and Tfinal = 10 Analytically, the integral of dv / ((1  (0.005 / 9.8 ) V^2), which I don't want to have to look up (like surveying before the HP35: eight place tables of Sin and Tan, and a Monroe handcrank calculator). Great that there is a handy calculator function to solve those pesky DEs. But the utility of the RKF solver is hampered save for Werner's guess that a << program object>> could be substituted for an 'algebraic object/expression', which is undocumented. I really do not think the firmware writers gave this much thought. Thanks for the link to the pdf of HP48 Insights. 

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