kepler5
Celestial Mechanics on a Graphing Calculator
5. The TI82 programs This column used 4 programs written in the TI version of BASIC. They should be easily convertible to any other form of that language. In these programs the list L_{1} acts like the 4component vector (x,y,v,w). The windows are adjustable inside the programs, and are set for initial conditions similar to those used in the column. The input L_{1} must be given as a list inside curly brackets {}. The other inputs requested are B the stopping time, N the number of steps, or M the maximum velocity rotation tolerance, as appropriate. In RKADAPT the sine of the angle between the old velocity vector and the new is compared with the tolerance. The three programs EULER4, RK and RKADAPT all use the program KSUB as subroutine.

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