import tkinter as tk
import numpy as np
import matplotlib.pyplot as plt
import math

class Basis:                                     # Class with gravity - without air-resistance
def __init__(self, tyng):
   self.tyng = tyng                         # tyng = gravitaional acceleration

# Function for gravity class. tidspunkt = time, tilstandsvektor = vector (used as parameter)
def evaluate(self, tidspunkt, tilstandsvektor):
   x_pos = 0                         # x acceleration
   y_pos = self.tyng                # y acceleration
   x_fart = tilstandsvektor[2]       # x_fart = x_velocity
   y_fart = tilstandsvektor[3]       # y_fart = y_velocity
   endring = np.array([x_fart, y_fart, x_pos, y_pos])*tidspunkt    # endring = change
   return endring                                                    # returning [new_x, new_y, new_xDot, new_yDot] vector

class Luft:                               # Class where drag is applied. Luft = Air (with air resistance)

def __init__(self, tyng, luftm):                      # luftm = drag (parameter - air resistance)
   self.tyng = tyng
   self.luftm = luftm

def evaluate(self, tidspunkt, tilstandsvektor):          # function for drag
   x_fart = tilstandsvektor[2]                         # same as in the previous class function
   y_fart = tilstandsvektor[3]
   F = math.sqrt(x_fart**2 + y_fart**2)                # F = V for velocity
   x_pos = -(self.luftm * x_fart * F)                   # x position
   y_pos = self.tyng - (self.luftm

Problem Description: Plotting Amplitude, Period, Phase and Frequenc...