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Update program and add gitignore

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Ceres 2025-10-12 15:49:48 +01:00
parent d6aa03309c
commit 00db3aea6f
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Exercise 1/exercise1.py
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@ -1,68 +1,76 @@
from math import *
import numpy as np
from scipy.integrate import solve_ivp
import matplotlib.pyplot as plt
def part1(radFactor, orbits):
#Part one Diffeq
def f_part1(t, state, Me, Mm, G):
xm, ym, vx, vy = state
#Part one Diffeq
def f_part1(t, state, Me, Mm, G):
xm, ym, vx, vy = state
dvxdt = -(Me*G*xm)/((xm**2+ym**2)**(3/2))
dxmdt = vx
dvydt = -(Me*G*ym)/((xm**2+ym**2)**(3/2))
dymdt = vy
dvxdt = -(Me*G*xm)/((xm**2+ym**2)**(3/2))
dxmdt = vx
dvydt = -(Me*G*ym)/((xm**2+ym**2)**(3/2))
dymdt = vy
return (dxmdt, dymdt, dvxdt, dvydt)
return (dxmdt, dymdt, dvxdt, dvydt)
# Initial Conditions
t_min = 0
t_max = 86400*20
numpoints = 200
t = np.linspace(t_min, t_max, numpoints)
# Initial Conditions
Me = 5.97*(10**24)
Mm = 7.35*(10**22)
G = 6.67*(10**-11)
xm0 = 384400000
ym0 = 0
vx0 = 0
vy0 = 1017.79
t_min = 0
t_max = 2360620*int(orbits)
numpoints = 2000*int(orbits)
t = np.linspace(t_min, t_max, numpoints)
Me = 5.97*(10**24)
Mm = 7.35*(10**22)
G = 6.67*(10**-11)
r = 384400000
v = sqrt((G*Me)/r)*float(radFactor)
xm0 = r
ym0 = 0
vx0 = 0
vy0 = v
rtol = 1e-5
atol = 1e-8
#Solver
results = solve_ivp(f_part1, (t_min,t_max), (xm0, ym0, vx0, vy0), args=(Me, Mm, G), t_eval=t)
#Solver
results = solve_ivp(f_part1, (t_min,t_max), (xm0, ym0, vx0, vy0), args=(Me, Mm, G), t_eval=t, atol=atol, rtol=rtol)
#Graph plotting
ax=plt.axes() # This creates some axes, so that we
ax.set_aspect(1) # can set the aspect ratio to 1 i.e.
# x and y axes are scaled equally.
ax.set_xlabel("x coordinate (m)") # Must label axes (with
ax.set_ylabel("y coordinate (m)") # units) and give
ax.set_title("Orbit of moon around earth") # plot title.
#
ax.plot(results.y[0],results.y[1]) # Make the plot
ax.legend(['Moon']) # and add a key.
plt.show()
#Graph plotting
ax=plt.axes() # This creates some axes, so that we
ax.set_aspect(1) # can set the aspect ratio to 1 i.e.
# x and y axes are scaled equally.
ax.set_xlabel("x coordinate (m)") # Must label axes (with
ax.set_ylabel("y coordinate (m)") # units) and give
ax.set_title("Orbit of moon around earth") # plot title.
#
ax.plot(results.y[0],results.y[1]) # Make the plot
ax.plot(0,0)
ax.legend(['Moon']) # and add a key.
plt.show()
# MyInput = '0'
# while MyInput != 'q':
# MyInput = input('Enter a choice, "1", "2" or "q" to quit: ')
# print('You entered the choice: ',MyInput)
# if MyInput == '1':
# print('You have chosen part (1): simulation of a lunar orbit')
# #
# # put your code for part (1) here
# #
# elif MyInput == '2':
# print('You have chosen part (2): earth-moon-probe system')
# #
# # put your code for part (2) here
# #
# elif MyInput != 'q':
# print('This is not a valid choice')
# print('You have chosen to finish - goodbye.')
MyInput = '0'
while MyInput != 'q':
MyInput = input('Enter a choice, "1", "2" or "q" to quit: ')
print('You entered the choice: ',MyInput)
if MyInput == '1':
print('You have chosen part (1): simulation of a lunar orbit')
radFactor = input(f'Enter the velocity scalar. A value of 1 will result in a circular orbit, and anything else will give an elliptical orbit: ')
orbits = input(f'Enter the approximate number of orbits desired: ')
part1(radFactor, orbits)
elif MyInput == '2':
print('You have chosen part (2): earth-moon-probe system')
#
# put your code for part (2) here
#
elif MyInput != 'q':
print('This is not a valid choice')
print('You have chosen to finish - goodbye.')