gonzales.lib.physics

• gonzales.lib.physics.calc_com(r, m)

  Calculates center of mass of a set of particles.

  Parameters

  • r – N x 3 numpy array, position vectors of the particles

  • m – N x 1 numpy array, mass vector of the particles

  Returns

  1 x 3 numpy array, center of mass

• gonzales.lib.physics.calc_ke(v, m)

  Calculates kinetic energy of a system of particles.

  Parameters

  • v – N x 3 numpy array, velocity vectors of the particles

  • m – N x 1 numpy array, mass vector of the particles

  Returns

  double, kinetic energy of the system

• gonzales.lib.physics.calc_pe(r, m, G, eps)

  Calculates potential energy of a system of particles.

  Parameters

  • r – N x 3 numpy array, position vectors of the particles

  • m – N x 1 numpy array, mass vector of the particles

  • G – gravitational constant

  • eps – gravitational softening

  Returns

  double, potential energy of the system

• gonzales.lib.physics.calc_te(r, v, m, G, eps)

  Calculates total mechanical energy of a system of particles.

  Parameters

  • r – N x 3 numpy array, position vectors of the particles

  • v – N x 3 numpy array, velocity vectors of the particles

  • m – N x 1 numpy array, mass vector of the particles

  • G – gravitational constant

  • eps – gravitational softening

  Returns

  double, total mechanical energy of the system

• gonzales.lib.physics.calc_ang_mom(r, v, m)

  Calculates angular momentum of a system of particles.

  Parameters

  • r – N x 3 numpy array, position vectors of the particles

  • v – N x 3 numpy array, velocity vectors of the particles

  • m – N x 1 numpy array, mass vector of the particles

  Returns

  1 x 3 numpy array, angular momentum vector