pynbody.gravity

Routines for calculating gravitational potential and accelerations.

See also

pynbody.analysis.profile provides a user-friendly interface to rotation curves.

Functions

all_direct(f[, eps])	Calculate the potential and acceleration for all particles in the snapshot using a direct summation algorithm.
all_pm(f[, ngrid])	Calculate the potential and acceleration for all particles in the snapshot using a Particle-Mesh algorithm.
direct(f, ipos[, eps, num_threads])	Calculate the gravitational acceleration and potential at the specified positions
midplane_potential(f, rxy_points[, eps])	Calculate the potential of a disk galaxy in the x-y midplane (with z=0)
midplane_rot_curve(f, rxy_points[, eps])	Calculate the rotation curve of a disk galaxy in the x-y midplane (with z=0)
pm(f, ipos[, ngrid, x0, x1])	Calculate the potential and acceleration for a set of particles using a Particle-Mesh algorithm.