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README
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README
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DIRECT VESION 1.2
A "fast" O(N^2) gravity code useful for checking more
sophisticated gravity codes, such as tree-codes,
Fast Multipole codes and FFT-based grid codes. Also useful
in the analysis of errors and approximations in such codes.
Stadel Release 1.2: October 11, 1994
Featrures:
* Checkpointing
* Mark Arrays
* Periodic Boundary Conditions using the
Ewald Summation Technique
* Several gravitational softening methods:
Plummer, Uniform density sphere and Cubic Spline
Changes from v1.11:
* Masses are now always taken from the TIPSY BINARY input
file. You can no longer specify -m or -dm.
* Softening is taken from the TIPSY BINARY input file, by
default. If you want to set the softening (say to zero)
then you can specify the -e argument as before.
* Softening is done in a symmetric fashion, that is, the
interaction between patricle i and particle j uses the
softening fSoft = 0.5*(fSoft_i + fSoft_j). If all the
particles have the same softening this is equivalent to
the previous definition.
Files Included:
README
Makefile
main.c
kd.c
kd.h
grav.c
grav.h
ewald.c
ewald.h
spline.h
tipsydefs.h
man1/direct.1
cat1/direct.1