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Estimating Pi using Monte Carlo method
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# -*- coding: utf-8 -*- | |
from random import random | |
from math import sqrt | |
from turtle import * | |
speed(0) # Máxima velocidad | |
n = 100 # Número de intentos | |
scale = 200 # Proporción del dibujo, por defecto es 200 | |
pos = [(-1.5,.5),(0,.5),(-1.5,-1),(0,-1)] # Posición de los gráficos | |
font = ('Arial', scale/20, 'bold') | |
template = "Dentro: {}\nIntentos: {}\nπ = {}" | |
def estimar_pi(n, scale, off_x, off_y): | |
goto(off_x, off_y) | |
# dibujar cuadrado | |
down() | |
for i in range(4): | |
forward(scale) | |
left(90) | |
# dibujar semicírculo | |
up() | |
forward(scale) | |
left(90) | |
down() | |
circle(scale, 90) | |
# dibujar puntos de intentos | |
shape("circle") | |
shapesize(.5,.5,.5) | |
inside = 0 | |
for i in range(0,n): | |
up() | |
x=random() | |
y=random() | |
if sqrt(x*x + y*y) <= 1: | |
inside += 1. | |
color('green') | |
else: | |
color('red') | |
goto(x*scale + off_x, y*scale + off_y) | |
down() | |
stamp() | |
up() | |
# estimar pi | |
pi = 4 * (inside / n) | |
print(pi) | |
# escribir resultado | |
goto(0 + off_x,-.3*scale + off_y) | |
hideturtle() | |
down() | |
color('black') | |
write(template.format(inside, n, pi), font=font) | |
return(pi) | |
if __name__ == "__main__": | |
pi = [] | |
for i in range(4): | |
up() | |
home() | |
pi.append(estimar_pi(n, scale, pos[i][0]*scale, pos[i][1]*scale)) | |
up() | |
goto(-1 * scale,-1.75 * scale) | |
down() | |
write('π promedio: {}'.format(sum(pi) / 4), font=('Arial', scale/10, 'bold')) |
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