📅  最后修改于: 2020-06-10 01:09:36             🧑  作者: Mango
numpy.tile(arr, repetitions) : 通过重复数组–“ arr”(每次重复我们要重复的次数)来构造一个新数组。结果数组的维数为max(arr.ndim,repetitions),其中,repeats是重复的长度。
如果arr.ndim>重复,则通过在其前面加上1来将代表提升为arr.ndim。
如果arr.ndim <重复,则通过在新轴前添加reps来将其提升为arr.ndim。
参数:
array:[array_like]输入数组。
repetitions:每个轴上arr的重复次数。
返回:
具有重复数组的数组-按照d的arr,我们要重复arr的次数
代码1:
# Python程序说明numpy.tile()
import numpy as geek
# 处理一维
arr = geek.arange(5)
print("arr : \n", arr)
repetitions = 2
print("重复两次arr : \n", geek.tile(arr, repetitions))
repetitions = 3
print("\n重复arr 3次 : \n", geek.tile(arr, repetitions))
# [0 1 2 ...,2 3 4]表示[0 1 2 3 4 0 1 2 3 4 0 1 2 3 4]由于它是长输出,因此使用[...]
输出:
arr:
[0 1 2 3 4]
重复两次arr:
[0 1 2 3 4 0 1 2 3 4]
重复arr 3次:
[0 1 2 ...,2 3 4]
代码2:
# Python程序,说明numpy.tile()
import numpy as geek
arr = geek.arange(3)
print("arr : \n", arr)
a = 2
b = 2
repetitions = (a, b)
print("\n重复arr : \n", geek.tile(arr, repetitions))
print("形状 : \n", geek.tile(arr, repetitions).shape)
a = 3
b = 2
repetitions = (a, b)
print("\n重复arr : \n", geek.tile(arr, repetitions))
print("形状 : \n", geek.tile(arr, repetitions).shape)
a = 2
b = 3
repetitions = (a, b)
print("\n重复arr : \n", geek.tile(arr, repetitions))
print("形状 : \n", geek.tile(arr, repetitions).shape)
输出:
arr:
[0 1 2]
重复arr:
[[0 1 2 0 1 2]
[0 1 2 0 1 2]
形状:
(2、6)
重复arr:
[[0 1 2 0 1 2]
[0 1 2 0 1 2]
[0 1 2 0 1 2]
形状:
(3,6)
重复arr:
[[0 1 2 ...,0 1 2]
[0 1 2 ...,0 1 2]]
形状:
(2、9)
代码3:(repetitions== arr.ndim)== 0
# ython程序,说明numpy.tile()
import numpy as geek
arr = geek.arange(4).reshape(2, 2)
print("arr : \n", arr)
a = 2
b = 1
repetitions = (a, b)
print("\n重复arr : \n", geek.tile(arr, repetitions))
print("形状 : \n", geek.tile(arr, repetitions).shape)
a = 3
b = 2
repetitions = (a, b)
print("\n重复arr : \n", geek.tile(arr, repetitions))
print("形状 : \n", geek.tile(arr, repetitions).shape)
a = 2
b = 3
repetitions = (a, b)
print("\n重复arr : \n", geek.tile(arr, repetitions))
print("形状 : \n", geek.tile(arr, repetitions).shape)
输出:
arr:
[[0 1]
[2 3]
重复arr:
[[0 1]
[2 3]
[0 1]
[2 3]
形状:
(4,2)
重复arr:
[[0 1 0 1]
[2 3 2 3]
[0 1 0 1]
[2 3 2 3]
[0 1 0 1]
[2 3 2 3]
形状:
(6、4)
重复arr:
[[0 1 0 1 0 1]
[2 3 2 3 2 3]
[0 1 0 1 0 1]
[2 3 2 3 2 3]
形状:
(4、6)