## 如何使用Python turtle绘制函数？内容来源于 Stack Overflow，并遵循CC BY-SA 3.0许可协议进行翻译与使用

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```import turtle
ivy = turtle.Turtle()

def plotter(x):
y = (0.5 * x) + 3
ivy.goto(0, y)

plotter(x=20)```

### 2 个回答

```from turtle import *

ht(); speed(0)
color('green'); width(1)

for i in range(4): # axes
fd(80); bk(80); rt(90)

color('red'); width(2)
pu(); goto(-50, -70); pd()

for x in range(-50, 30):
y = 2*x + 30
goto(x, y)```

```from turtle import Turtle, Screen

WIDTH, HEIGHT = 20, 15  # coordinate system size

def plotter(turtle, x_range):
turtle.penup()

for x in x_range:
y = x / 2 + 3
ivy.goto(x, y)
turtle.pendown()

def axis(turtle, distance, tick):
position = turtle.position()
turtle.pendown()

for _ in range(0, distance // 2, tick):
turtle.forward(tick)
turtle.dot()

turtle.setposition(position)

for _ in range(0, distance // 2, tick):
turtle.backward(tick)
turtle.dot()

screen = Screen()
screen.setworldcoordinates(-WIDTH/2, -HEIGHT/2, WIDTH//2, HEIGHT/2)

ivy = Turtle(visible=False)
ivy.speed('fastest')
ivy.penup()
axis(ivy, WIDTH, 1)

ivy.penup()
ivy.home()
axis(ivy, HEIGHT, 1)

plotter(ivy, range(-WIDTH//2, WIDTH//2))

screen.exitonclick()```

```import numpy as np
import matplotlib.pyplot as plt

def f(x):
return x / 2 + 3

t = np.arange(-10, 10, 0.5)

plt.plot(t, f(t))

plt.show()```