随笔分类 -  Python

Python: 2nd-order ODES -- Euler, RK4 and SciPy methods. Pendulum as an exapmle
摘要：1 import numpy as np 2 import matplotlib.pyplot as plt 3 import math 1 # Euler 2 def f(t,theta1,theta2): 3 return theta2 4 5 def g(t,theta1,theta2): 6 阅读全文
posted @ 2020-12-19 02:12 cfdchen 阅读(211) 评论(0) 推荐(0)
Python: 2D integration. Compare of rectangle, Simpson and SciPy methods
摘要：1 import numpy as np 2 import matplotlib.pyplot as plt 3 import math 4 5 from mpl_toolkits.mplot3d import Axes3D 6 7 xmin=-5 8 xmax=5 9 ymin=-5 10 yma 阅读全文
posted @ 2020-12-19 01:44 cfdchen 阅读(163) 评论(0) 推荐(0)
Python: 快速实现人脸识别
摘要：首先安装opencv：（在jupyter notebook里） 1 ! pip install opencv-python 接下来，从电脑的摄像头读取视频，识别视频内的人脸。 1 import cv2 2 3 face_cascade = cv2.CascadeClassifier('haarcas 阅读全文
posted @ 2020-10-20 08:31 cfdchen 阅读(915) 评论(0) 推荐(0)
Python: 2D integration with Scipy
摘要：1 # import packages 2 import matplotlib.pyplot as plt 3 import numpy as np 4 import time 5 from mpl_toolkits.mplot3d import Axes3D 6 from matplotlib i 阅读全文
posted @ 2020-10-20 07:25 cfdchen 阅读(153) 评论(0) 推荐(0)
Python: use Rectangle method, Trapezoid method, Simpson method to do integration numerically
摘要：1 import numpy as np 2 import matplotlib.pyplot as plt 3 4 filename = 'Unradiated_CG_Steel.txt' 5 f = np.genfromtxt(filename, delimiter=',') 6 X = f[: 阅读全文
posted @ 2020-10-20 07:13 cfdchen 阅读(156) 评论(0) 推荐(0)
Python: use central difference method to solve curl equation and plot it
摘要：Using Python to realize difference method. Here the data is from expermient. Use Central Difference method to solve the inner points, while forward di 阅读全文
posted @ 2020-10-02 05:08 cfdchen 阅读(386) 评论(0) 推荐(0)
Python 入门练习--Axes3D 画3D图
摘要：1 import numpy as np 2 import matplotlib.pyplot as plt 3 from mpl_toolkits.mplot3d import Axes3D # used for 3d plot 4 5 x = np.linspace(0,100,50) 6 y 阅读全文
posted @ 2020-09-26 09:35 cfdchen 阅读(2601) 评论(0) 推荐(0)
Python 入门练习--读取数据，并将某几列的数据赋值给变量
摘要：There are many commands that can load data into Python. Here I use genfromtxt and loadtxt as example. 1 import numpy as np 2 my_data = np.genfromtxt(' 阅读全文
posted @ 2020-09-26 09:33 cfdchen 阅读(2237) 评论(0) 推荐(0)
Python 入门练习--matplotlib.pyplot画图
摘要：5 (x,y) data point: [1,2], [3,4], [5,6],[7,8]. Use Matplotlib to plot out these data points. 1 import matplotlib.pyplot as plt 2 figure1 = plt.plot( [ 阅读全文
posted @ 2020-09-26 09:19 cfdchen 阅读(181) 评论(0) 推荐(0)
Python 入门练习 (list, array, for loop, while loop, numpy)
摘要：1- Create an empty list name “mylist” 1 mylist = [] 2 mylist # print mylist 2- Append the following floating point numbers to the list: 4.0, 2.2, 5.7, 阅读全文
posted @ 2020-09-26 09:09 cfdchen 阅读(271) 评论(0) 推荐(0)