textbook example code: plot_density_distributions.pyΒΆ

[source code]

import numpy
from amuse.lab import *
from optparse import OptionParser
from matplotlib import pyplot
from amuse.plot import scatter, xlabel, ylabel

from amuse.community.fractalcluster.interface import new_fractal_cluster_model

from prepare_figure import figure_frame, quad_frame, single_frame
from distinct_colours import get_distinct

def plot_projected_density(model, xmin=-1, xmax=1, col=0):
    pyplot.xlim(xmin, xmax)
    pyplot.ylim(xmin, xmax)
    cols = get_distinct(4)
    pyplot.scatter(model.x.value_in(nbody_system.length),
                   model.z.value_in(nbody_system.length),
                   c=cols[col], s=80, lw=0)

def plummer_model(N, x_label = 'x [length]', y_label='y [length]'):
    fig = single_frame(x_label, y_label, xsize=8, ysize=8)
    model = new_plummer_model(N)
    plot_projected_density(model, col=0)
    file = "plummer_model.png"
    pyplot.savefig(file)
    print 'Saved figure in file', file

def king_model(N, W=9, x_label = 'x [length]', y_label='y [length]'):
    fig = single_frame(x_label, y_label, xsize=8, ysize=8)
    ax = pyplot.gca()
    model = new_king_model(N, W)
    plot_projected_density(model, col=1)
    file = "king_model.png"
    pyplot.savefig(file)
    print 'Saved figure in file', file

def fractal_model(N, F=1.6, x_label = 'x [length]', y_label='y [length]'):
    fig = single_frame(x_label, y_label, xsize=8, ysize=8)
    ax = pyplot.gca()
    model = new_fractal_cluster_model(N=N, fractal_dimension=1.6,
                                      random_seed=42)
    plot_projected_density(model, col=2)
    file = "fractal_model.png"
    pyplot.savefig(file)
    print 'Saved figure in file', file

def galaxy_model(N, x_label = 'x [length]', y_label='y [length]'):
    fig = single_frame(x_label, y_label, xsize=8, ysize=8)
    ax = pyplot.gca()
    model = new_halogen_model(N, alpha=1., beta=5., gamma=0.5)
    plot_projected_density(model, col=3)
    file = "galaxy_model.png"
    pyplot.savefig(file)
    print 'Saved figure in file', file

def main(N=10):
    numpy.random.seed(42)
    print ''
    plummer_model(N)
    king_model(N)
    fractal_model(N)
    galaxy_model(N)
    print ''

def new_option_parser():
    result = OptionParser()
    result.add_option("-N", dest="N", type="int",default = 1000,
                      help="number of stars [1000]")
    return result

if __name__ in ('__main__', '__plot__'):
    o, arguments  = new_option_parser().parse_args()
    main(**o.__dict__)

Keywords: python, amuse, astrophysics, matplotlib, pylab, example, codex (see how-to-search-examples)