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#!/usr/bin/env python
# Import some libraries
import math
import numpy as np
import matplotlib.pyplot as plt
import time
import os
import sys
# Defining some variables
sigma = 200
f_0 = 0.1
R_s = 1e4
# Defining some constants
pi = math.pi
e = math.e
G = 4.302e-3
# rho function
def rho(r):
a = (1) / (math.sqrt( 2 * pi ) * sigma )
b = math.exp( - (phi(r) / sigma ** 2 ) )
return a * b
# phi function
def phi(x):
if x == 0:
return -4 * pi * f_0 * G * R_s**2
else:
a = - ( 4 * pi * G * f_0 * R_s ** 3 ) / x
b = np.log(1. + (x / R_s) )
return a * b
# Defining a list to store the rho-values for plotting
list_rho = []
# Define the path to where the data should be stored
path = 'data/' + str(sys.argv[2]) + '.csv'
# get the start time
start = time.time()
# define the number of stars using system arguments
stars = int(float(sys.argv[1]))
# open the file where the information should be written to
with open(path, "a") as data:
# for every star
for i in range(0, stars):
# calculate the rho value
rho_i = rho(i/10)
# append the rho value to list_rho for plotting
# list_rho.append(rho_i)
# print the distance to the center of the universe and the rho value to
# the user
print(str(i) + ", " + str(rho_i))
# write the data into the file
data.write(str(i) + ", " + str(rho_i) + "\n")
# get the end time
end = time.time()
# calculate the runtime
runtime = end - start
# print some information to the user
print("\n Runtime: ", end="")
print(str(runtime) + " seconds")
print(" Stars: " + str(stars))
print(" Rho-values per second: ", end="")
print(str(stars / runtime))
# plt.plot(list_rho)
# plt.xscale('log')
# plt.yscale('log')
# plt.grid()
# plt.show()
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