Python 中的 numpy.cos()
哎哎哎:# t0]https://www . geeksforgeeks . org/num py-cos-python/
numpy.cos(x[，out]) = ufunc 'cos') : 这个数学函数帮助用户计算所有 x(作为数组元素)的三角余弦。 参数:
array : [array_like]elements are in radians.
2pi Radians = 360 degrees
返回:
An array with trigonometric cosine
of x for all x i.e. array elements
代码#1:工作
计算机编程语言
# Python program explaining
# cos() function
import numpy as np
import math
in_array = [0, math.pi / 2, np.pi / 3, np.pi]
print ("Input array : \n", in_array)
cos_Values = np.cos(in_array)
print ("\nCosine values : \n", cos_Values)
输出:
Input array :
[0, 1.5707963267948966, 1.0471975511965976, 3.141592653589793]
Cosine values :
[ 1.00000000e+00 6.12323400e-17 5.00000000e-01 -1.00000000e+00]
代码#2:图形表示
计算机编程语言
# Python program showing
# Graphical representation of
# cos() function
import numpy as np
import matplotlib.pyplot as plt
in_array = np.linspace(-(2*np.pi), 2*np.pi, 20)
out_array = np.cos(in_array)
print("in_array : ", in_array)
print("\nout_array : ", out_array)
# red for numpy.cos()
plt.plot(in_array, out_array, color = 'red', marker = "o")
plt.title("numpy.cos()")
plt.xlabel("X")
plt.ylabel("Y")
plt.show()
输出:
in_array : [-6.28318531 -5.62179738 -4.96040945 -4.29902153 -3.6376336 -2.97624567
-2.31485774 -1.65346982 -0.99208189 -0.33069396 0.33069396 0.99208189
1.65346982 2.31485774 2.97624567 3.6376336 4.29902153 4.96040945
5.62179738 6.28318531]
out_array : [ 1\. 0.78914051 0.24548549 -0.40169542 -0.87947375 -0.9863613
-0.67728157 -0.08257935 0.54694816 0.94581724 0.94581724 0.54694816
-0.08257935 -0.67728157 -0.9863613 -0.87947375 -0.40169542 0.24548549
0.78914051 1\. ]
参考文献: https://docs . scipy . org/doc/numpy-dev/reference/generated/numpy . cos . html # numpy . cos 。
