Python如何绘制正弦波图

Question

我有这个信号：

from math import*
Fs=8000
f=500
sample=16
a=[0]*sample
for n in range(sample):
    a[n]=sin(2*pi*f*n/Fs)

如何绘制图形（此正弦波）？

并创建xlabel的名称为＆＃39; voltage（V）＆＃39;和ylabel作为＆＃39;样本（n）＆＃39;

要执行此操作的代码是什么？

我非常感谢你的帮助^ _ ^

Answer 1

我希望这会有所帮助：

import matplotlib.pyplot as plt
import numpy as np


Fs = 8000
f = 5
sample = 8000
x = np.arange(sample)
y = np.sin(2 * np.pi * f * x / Fs)
plt.plot(x, y)
plt.xlabel('sample(n)')
plt.ylabel('voltage(V)')
plt.show()

P.S。：为了舒适的工作，您可以使用The Jupyter Notebook。

Answer 2

import matplotlib.pyplot as plt # For ploting
import numpy as np # to work with numerical data efficiently

fs = 100 # sample rate 
f = 2 # the frequency of the signal

x = np.arange(fs) # the points on the x axis for plotting
# compute the value (amplitude) of the sin wave at the for each sample
y = np.sin(2*np.pi*f * (x/fs)) 

#this instruction can only be used with IPython Notbook. 
% matplotlib inline
# showing the exact location of the smaples
plt.stem(x,y, 'r', )
plt.plot(x,y)

Answer 3

import math
import turtle

ws = turtle.Screen()
ws.bgcolor("lightblue")
fred = turtle.Turtle()
for angle in range(360):
    y = math.sin(math.radians(angle))
    fred.goto(angle, y * 80)

ws.exitonclick()

Answer 4

有用的窗口可能已经过去了，但我正在解决类似的问题。这是我尝试使用乌龟模块绘制正弦。

from turtle import *
from math import *

#init turtle
T=Turtle()

#sample size
T.screen.setworldcoordinates(-1,-1,1,1) 

#speed up the turtle
T.speed(-1)

#range of hundredths from -1 to 1
xcoords=map(lambda x: x/100.0,xrange(-100,101))

#setup the origin
T.pu();T.goto(-1,0);T.pd()

#move turtle
for x in xcoords:
    T.goto(x,sin(xcoords.index(x)))

Answer 5

使用matplotlib在python中绘制正弦波的简单方法。

CreateMMF()

Answer 6

IFERROR

Answer 7

import numpy as np
import matplotlib.pyplot as plt

F = 5.e2          # No. of cycles per second, F = 500 Hz
T = 2.e-3         # Time period, T = 2 ms
Fs = 50.e3        # No. of samples per second, Fs = 50 kHz
Ts = 1./Fs        # Sampling interval, Ts = 20 us
N = int(T/Ts)     # No. of samples for 2 ms, N = 100

t = np.linspace(0, T, N)
signal = np.sin(2*np.pi*F*t)

plt.plot(t, signal)
plt.xlabel('Time (s)')
plt.ylabel('Voltage (V)')
plt.show()

Answer 8

这是另一个选择

#!/usr/bin/env python

import numpy as np
import matplotlib
matplotlib.use('TKAgg') #use matplotlib backend TkAgg (optional)
import matplotlib.pyplot as plt

sample_rate = 200 # sampling frequency in Hz (atleast 2 times f)
t = np.linspace(0,5,sample_rate)    #time axis
f = 100 #Signal frequency in Hz
sig = np.sin(2*np.pi*f*(t/sample_rate))
plt.plot(t,sig)
plt.xlabel("Time")
plt.ylabel("Amplitude")
plt.tight_layout() 
plt.show()

Answer 9

还有另一种绘制正弦波的方法。

import numpy as np
import matplotlib
matplotlib.use('TKAgg') #use matplotlib backend TKAgg (optional)
import matplotlib.pyplot as plt

t = np.linspace(0.0, 5.0, 50000)       # time axis
sig = np.sin(t)
plt.plot(t,sig)