Im graphing the population of a town but to add randomness im adding dummy values to emulate the look of a stock price etc. it works however the years have to be doubled as im adding two x values. 1 is the real population and the next is dummy population. the only way i can think of is multiplying the the range of y values by 2 but then when i put in 10 years its basically saying its over 20 years. this is the full code below. sorry if i poorly explained. import matplotlib.pyplot as plt import numpy as np import random def main(): P = 14613 K = 26760 e = np.exp(1) R = 0.083 T = 0 year = 2006 font1 = {'family':'serif','color':'blue','size':20} font2 = {'family':'serif','color':'darkred','size':15} population = [] years = [] amount_years = int(input("How many years since 2006 do you want to calcuate the population: ")) for x in range(0, amount_years): noise = random.uniform(-0.03,0.03) equation = (P*K*(e**(R*T)))/((K-P)+P*(e**(R*T))) dummy_pop = equation*noise x = equation + dummy_pop T += 1 population.append(equation) population.append(x) for x in range(0,amount_years): years.append(year) year += 0.5 xpoints = years ypoints = population plt.title("Portlaoise population since 2006", fontdict = font1, loc= 'left') plt.xlabel("Years since 2006", fontdict = font2) plt.ylabel("Population of Portlaoise", fontdict = font2) plt.plot(xpoints, ypoints) plt.show() main() Continue reading...