Numpy _ base _ 1, numpy base _ 1

Numpy _ base _ 1, numpy base _ 1

Ndarray: multidimensional array

Ndarray each array element must be of the same type, and each array has a shape and dtype object.

Shape indicates the array size.

Dtype indicates the array data type

Array

How to create an array?

In [1]: import numpy as np

In [2]: data = [1, 2, 3, 4, 5, 6, 7]

In [3]: arr = np. array (data)

In [3]: arr

Out [3]: array ([1, 2, 3, 4, 5, 6, 7])

 

View array size

Arr. shape

View array data types

Arr. dtype

Asarray

Np. asarray (1, 2, 3, 4, 5, 6, 7)

Arange

Np. arange (10)

Ones

Create an array full of 1

Ones_like

Zeros

Create a zero-dimensional array

2-Dimension

Create a two-dimensional array with all values 0

Dimension 3

Create a 3D array with all values 0

Empty

Enter the memory spam value, but do not fill the value

Empty_lile

Input an array to create an array full of 1

Eye

Create an N * N Array with a diagonal line of 1 and other values of 0

Identity

Create an N * N Array with a diagonal line of 1 and other values of 0