Return an Nbody object that contains only particles where the
corresponding value in c is not zero.
c is a Numeric array.
selectp(
[lst],[file])
Return an Nbody object that contains only particles with indexes.
The list of indexes is given either by lst ( Int Numeric array) or
by the name (file) of a file containing the list of id's.
sub(
[n1],[n2])
Return an Nbody object that have particles with indexes in the range [n1,n2].
n1: number of the first particle (default=1)
n2: number of the last particle (default=None)
reduc(
n)
Return an Nbody object that contains a fraction 1/n of particles.
Only particles that have an index equal to a multiple of n are conserved.
select(
type)
Return an Nbody object that contain only particles of type type.
This function depends on the object format.
getindex(
num)
Return an array of index of a particle from its specific number id.
The array is empty if no particle corresponds to the specific number id.
num : Id of the particle
Numeric array.