weixin_44183162的博客

4月23日改

修改于2019年4月24日：二次修改

import matplotlib.pyplot as pltimport numpy as npdata = np.load("国民经济核算季度数据.npz")values = data['values']columns = data['columns']plt.rcParams['font.sans-serif'] = 'SimHei' #仿宋plt.rcParams['ax...

import matplotlib.pyplot as pltimport numpy as nprad = np.arange(0,np.pi*2 + 0.1 , 0.1)#siny = np.sin(rad)#画布p1 = plt.figure(figsize = (8,6),dpi = 80) #figsize画布大小 ， dpi指分辨率plt.title('sin/co...

import matplotlib.pyplot as pltimport numpy as npx = np.arange(0,1.1,0.1)y = 2*x + 1y1 = x**2 - 1#1创建画布plt.figure()#修改参数plt.rcParams[‘font.sans-serif’] = ‘SimHei’ #仿宋plt.rcParams[‘axes.unico...

import numpy as np#排序arr = np.random.randint(1,10,size=10)arr.sort() #sort() 没有返回值，排序完直接调用；sorted()有返回值print("排序后"，arr)arr1 = np.random.randint(1,10,size = (3,3))print(arr1)arr1.sort()print...

import numpy as nparr = np.arrange(100).reshape((10,10))np.save('arr',arr)#.npy是一个二进制文件，存放的是一个数组； 文件可以不声明后缀arr2 = np.arange(100).reshape((20,5))np.savez('arr2',arr2)#返回的是np2文件：是一个二进制文件#读取文件：...

import numpy as np#矩阵创建matrix1 = np.mat(“1 2 3;4 5 6;7 8 9”)print(matrix1,type(matrix1))matrix2 = np.matrix([[1,2,3],[4,5,6],[7,8,9]])print(matrix2)arr1 = np.eye(3)arr2 = 3*np.eye(3)matrix3 = ...

import numpy as np#数组索引arr = np.arange(10)print(arr[2])print(arr[::2])print(arr[-1])#二维数组的索引#（1）位置索引连续arr2 = np.array([[1,2,3,4,5],[4,5,6,7,8],[7,8,9,10,11]])print(arr2)#print(arr2[行索引值，列索...

import numpy as np#numpy:用来做科学计算的模块：数组，矩阵如何利用numpy，创建多维数组：如何利用numpy创建随机数如何创建我们的矩阵，矩阵的运算，数组的运算利用numpy读数据numpy的统计函数创建一个数组只有一行的数组叫：一维数组arry = np.array([1,2,3,4])print(arry,type(arry)) # [1 ...