codes.python(13and65)

Codes.python/P13/qc2.py

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+import numpy as np
+import math
+narray=np.array([7, 38, 4, 23, 18])
+sum1=narray.sum()
+narray2=narray*narray
+sum2=narray2.sum()
+mean=sum1/5
+var=sum2/5-mean**2
+sd=math.sqrt(var)
+print("The Expectation / Mean is{:.2f}".format(mean))
+print("The Variance is:{:.2f}".format(var))
+print("The Standard Deviation is:{:.2f}".format(sd))
+

Codes.python/P65/qc.py

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+# -*- coding: utf-8 -*-
+
+import numpy as np
+import matplotlib.pyplot as plt
+import time
+import os
+#from threading import Thread
+
+
+
+pHead = np.arange(0, 1.01, 0.01)
+
+n = len(pHead)
+H = np.zeros(n)
+
+for i in range(0, n):
+    p = [pHead[i], 1 - pHead[i]]
+    if pHead[i] == 0:
+        p = 1 - pHead[i]
+    elif 1 - pHead[i] == 0:
+        p = pHead[i]
+    #用np.round来控制精度
+    p = np.round(p, decimals = 3)
+    H[i] = -np.sum(p * np.log2(p))
+    #modify:修正0.3 % 0.1 = 0.099999999999999978这类python的bug，采用将小数转换为整数的方法
+    if pHead[i] * 10 % 1 == 0 and pHead[i] != 0 and pHead[i] != 1:
+        plt.ylabel('Probability')
+        plt.ylim(0, 1)
+        plt.bar(left = (0, 1), height = (p[0], p[1]), width = 1, align='center')
+        plt.title('pHead={:.2f}, pTail={:.2f}'.format(pHead[i], 1 - pHead[i]))
+        plt.xticks((0, 1), ('pHead', 'pTail'))
+        dirpath = os.path.dirname(__file__)
+        plt.savefig(dirpath + '\pHead={:.2f}, pTail={:.2f}.png'.format(pHead[i], 1 - pHead[i]))
+        plt.show(block = False)
+        #plt.show()
+        #可自行控制时间
+        time.sleep(3)
+        plt.close()
+
+
+
+
+

README.md

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-The codes and slides for the first year graduate student course, the Fundamental of Mobile Robot. For best performance please open the slides with MS Powerpoint 2013 or higher
+The codes and slides for the first year graduate student course, the Fundamental of Mobile Robot. For best performance please open the slides with MS Powerpoint 2013 or higher
 
 ## 学生更新记录：
 
-- 霍煜豪 邮箱：591144810@qq.com 学号：201730310153。刚开始学python，改的比较慢到目前才改了16个，而且改的比较烂。。
+- 钱琛 邮箱：949686345@qq.com 学号：201730310117