How to create an array in python

Direct definition method:

1. Direct definition

　　matrix=[0,1,2,3]

2. Indirect definition

　　matrix=[0 for i in range(4)]　　print(matrix)

Two Numpy methods:

Numpy has a built-in function to create an array from scratch:

zeros(shape) will create an array with the specified shape. 0-filled array. The default dtype is float64.

The following are several commonly used creation methods:

#coding=utf-8import numpy as np
a = np.array([1,2,3,4,5])print a
b = np.zeros((2,3))print b
c = np.arange(10)print c
d = np.arange(2,10,dtype=np.float)print d
e = np.linspace(1.0,4.0,6)print e
f = np.indices((3,3))print f

Three other conversion methods:

There is also a more commonly used method for arrays, which is Convert from other Python structures (e.g., lists, tuples).

Some examples are given below.

Convert list to array:

a = []
a.append((1,2,4))
a.append((2,3,4))
a = np.array(a)
a.flatten()

Convert tuple to array:

import numpy as np
mylist = [1,2,3]print tuple(mylist)
iarray = np.array(tuple(mylist))print iarray

Related recommendations: "Python Tutorial"

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