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Simulations, Data Analysis and Algorithms

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Figure 8 | Computational Astrophysics and Cosmology

Figure 8

From: A fast multipole method for stellar dynamics

Figure 8

Acceleration errors for improved FMM. Same as Figure 7 but for the multipole-acceptance criterion (16a) with ϵ=2× 10 7 (left) or (16b) with ϵ= 10 7 (right). The values for a and f are either taken from the direct-summation run (black), or obtained by low-oder FMM (red, see Section 5.4.2). In all cases the computational effort is similar to that of the FMM run shown in Figure 7 (since af criterion (16a) gives a tighter constraint than (16b) and hence requires larger ϵ for the same computational effort).

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