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Foil 30 Computation of accelerations - a simple parallel array algorithm

From CPS615-Discussion of Ordinary Differential Equations and Start of Parallel N-Body Algorithm Delivered Lectures of CPS615 Basic Simulation Track for Computational Science -- 10 October 96. by Geoffrey C. Fox *
Secs 126.7
Spread positions of particles into 2 3D arrays so that extra dimension is labelled by index in sum over particles that interact with a given particle
Xj is essentially transpose of Xi in second and third dimension

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