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Book4_Ch04_Python_Codes/Bk4_Ch4_05.py

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+
+###############
+# Authored by Weisheng Jiang
+# Book 4  |  From Basic Arithmetic to Machine Learning
+# Published and copyrighted by Tsinghua University Press
+# Beijing, China, 2022
+###############
+
+# Bk4_Ch4_05.py
+
+import numpy as np
+
+# define matrix
+A = np.matrix([[1, 2], 
+               [3, 4],
+               [5, 6]])
+
+# scaler
+k = 2;
+
+# column vector c
+c = np.array([[3],
+              [2],
+              [1]])
+
+# row vector r
+r = np.array([[2,1]])
+
+# broadcasting principles
+
+# matrix A plus scalar k
+A_plus_k = A + k
+
+# matrix A plus column vector c
+A_plus_a = A + c
+
+# matrix A plus row vector r
+A_plus_r = A + r
+
+# column vector c plus row vector r
+c_plus_r = c + r