python 实现正弦波、三角波、方波、锯齿波
直接上代码，本人由于工程测试需要，使用numpy的库写了下面的代码产生函数，
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import numpy as np
import matplotlib.pyplot as plt
def sin_wave(start,end,zhouqi,midu):
'''
:param start: the fist value of the wave
:param end: the end value of the wave
:param zhouqi: the zhouqi range of the wave
:param midu: every zhouqi, there are how many points in this zhouqi
:return: the x array and the y array
'''
# 根据numpy的sin函数，生成对应的y的坐标。
# y = np.sin(x)
xout=[]
yout=[]
for i in range(start,end,zhouqi):
x = np.arange(i, i + zhouqi, midu)
# y = np.where(x= i + zhouqi/2, i + zhouqi - x, x - i)
xout = np.append(xout, x)
yout = np.append(yout, y)
return xout,yout
def square_wave(start,end,zhouqi,midu):
'''
:param start: the fist value of the wave
:param end: the end value of the wave
:param zhouqi: the zhouqi range of the wave
:param midu: every zhouqi, there are how many points in this zhouqi
:return: the x array and the y array
'''
xout = []
yout = []
for i in range(start,end,zhouqi):
x = np.arange(i, i + zhouqi, midu)
# y = np.where(x= i+ zhouqi/2, 1,0)
xout = np.append(xout, x)
yout = np.append(yout, y)
return xout, yout
def swatooth_wave(start,end,zhouqi,midu):
'''
:param start: the fist value of the wave
:param end: the end value of the wave
:param zhouqi: the zhouqi range of the wave
:param midu: every zhouqi, there are how many points in this zhouqi
:return: the x array and the y array
'''
xout = []
yout = []
for i in range(start,end,zhouqi):
x = np.arange(i, i + zhouqi, midu)
# y = np.where(x= i, i + zhouqi - x, x - i)
xout = np.append(xout, x)
yout = np.append(yout, y)
return xout, yout
if __name__=='__main__':
x,y=sin_wave(1,10,2,0.0001)
# for i in range()
plt.plot(x,y)
plt.show()
x,y=triangle_wave(1,10,2,0.0001)
# for i in range()
plt.plot(x,y)
plt.show()
x,y=square_wave(1,10,2,0.0001)
# for i in range()
plt.plot(x,y)
plt.show()
x,y=swatooth_wave(1,10,2,0.0001)
# for i in range()
plt.plot(x,y)
plt.show()
将上面的代码简化一层
import numpy as np
import matplotlib.pyplot as plt
def sin_wave(start,zhouqi,midu,xdecimals,ydecimals):
'''
:param start: the fist value of the wave
:param end: the end value of the wave
:param zhouqi: the zhouqi range of the wave
:param midu: every zhouqi, there are how many points in this zhouqi
:param xdecimals: x decimals
:param ydecimals: y decimals
:return: the x array and the y array
'''
# 根据numpy的sin函数，生成对应的y的坐标。
# y = np.sin(x)
xout=[]
yout=[]
# for i in range(start,end,zhouqi):
x = np.around(np.arange(start,start+zhouqi,midu),decimals=xdecimals)
# y = np.where(x= start + zhouqi/2, start + zhouqi - x, x - start),decimals=ydecimals)
return x,y
def square_wave(start,zhouqi,midu,xdecimals,ydecimals):
'''
:param start: the fist value of the wave
:param end: the end value of the wave
:param zhouqi: the zhouqi range of the wave
:param midu: every zhouqi, there are how many points in this zhouqi
:return: the x array and the y array
'''
xout = []
yout = []
x =np.around(np.arange(start, start + zhouqi, midu),decimals=xdecimals)
# y = np.where(x= start+ zhouqi/2, 1,0),decimals=ydecimals)
return x, y
def swatooth_wave(start,zhouqi,midu,xdecimals,ydecimals):
'''
:param start: the fist value of the wave
:param end: the end value of the wave
:param zhouqi: the zhouqi range of the wave
:param midu: every zhouqi, there are how many points in this zhouqi
:return: the x array and the y array
'''
xout = []
yout = []
x =np.around(np.arange(start, start + zhouqi, midu),decimals=xdecimals)
# y = np.where(x= start, start + zhouqi - x, x - start),decimals=ydecimals)
return x,y
if __name__=='__main__':
x,y=sin_wave(1,10,2,0.1,xdecimals=2,ydecimals=5)
# for i in range()
plt.plot(x,y)
plt.show()
# x,y=triangle_wave(1,10,2,0.0001)
# # for i in range()
# plt.plot(x,y)
# plt.show()
# x,y=square_wave(1,10,2,0.0001)
# # for i in range()
# plt.plot(x,y)
# plt.show()
# x,y=swatooth_wave(1,10,2,0.0001)
# # for i in range()
# plt.plot(x,y)
# plt.show()
#