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Foil 29 N-body Runge Kutta Routine in Fortran90 - I

From Fox Presentation Fall 1995 CPS615 Basic Simulation Track for Computational Science -- Fall Semester 95/96/97. by Nancy McCracken and Geoffrey C. Fox
1 C Solves Newton's equations of motion using Runge-Kutta method
2 C which is globally 4th order. X and V are initial positions and
3 C velocities. The system is evolved over a time interval h*ns.
4 C X and V contain the updated state at that time.
  • real, dimension (1:3, 1:N) :: X,V, Xdelta1, Vdelta1, Xdelta2, Vdelta2, Xdelta3, Vdelta3, Xdelta4, Vdelta4
  • real h, h2
  • integer ns, k
  • INTERFACE
  • function Grav(X,M)
  • real array(1:3, 1:N) :: X, M , Grav
  • end function
  • end INTERFACE
5 C Grav is hard parallel algorithm and will be given later!
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