Python中的numpy.sqrt()
numpy.sqrt(array[, out])函数用于确定一个数组的正平方根,从元素上来说。
语法: numpy.sqrt()
参数:
array : [array_like] 输入值的平方根必须被确定。
out : [ndarray, optional] 用于放置结果的备用数组对象;如果提供,它必须具有与arr相同的形状。
返回: [ndarray] 返回数组中数字的平方根。
代码#1:
# Python program explaining
# numpy.sqrt() method
# importing numpy
import numpy as geek
# applying sqrt() method on integer numbers
arr1 = geek.sqrt([1, 4, 9, 16])
arr2 = geek.sqrt([6, 10, 18])
print("square-root of an array1 : ", arr1)
print("square-root of an array2 : ", arr2)
输出:
square-root of an array1 : [ 1. 2. 3. 4.]
square-root of an array2 : [ 2.44948974 3.16227766 4.24264069]
代码#2:
# Python program explaining
# numpy.sqrt() method
# importing numpy
import numpy as geek
# applying sqrt() method on complex numbers
arr = geek.sqrt([4, -1, -5 + 9J])
print("square-root of an array : ", arr)
输出:
square-root of an array : [ 2.00000000+0.j 0.00000000+1.j 1.62721083+2.76546833j]
代码#3:
# Python program explaining
# numpy.sqrt() method
# importing numpy
import numpy as geek
# applying sqrt() method on negative element of real numbers
arr = geek.sqrt([-4, 5, -6])
print("square-root of an array : ", arr)
输出:
RuntimeWarning: invalid value encountered in sqrt
square-root of an array : [ nan 2.23606798 nan]