Adding and Subtracting Matrices in Python
In this article, we will discuss how to add and subtract elements of the matrix in Python.
Example:
Suppose we have two matrices A and B. A = [[1,2],[3,4]] B = [[4,5],[6,7]] then we get A+B = [[5,7],[9,11]] A-B = [[-3,-3],[-3,-3]]
Now let us try to implement this using Python
1. Adding elements of the matrix
In the above code, we have used np.add() method to add elements of two matrices. If shape of two arrays are not same, that is arr1.shape != arr2.shape, they must be broadcastable to a common shape (which may be the shape of one or the other).
Python3
# importing numpy as npimport numpy as np # creating first matrixA = np.array([[1, 2], [3, 4]]) # creating second matrixB = np.array([[4, 5], [6, 7]]) print("Printing elements of first matrix")print(A)print("Printing elements of second matrix")print(B) # adding two matrixprint("Addition of two matrix")print(np.add(A, B)) |
Output:
Printing elements of first matrix [[1 2] [3 4]] Printing elements of second matrix [[4 5] [6 7]] Addition of two matrix [[ 5 7] [ 9 11]]
2. Subtracting elements of matrices
In the above code, we have used np.subtract() to subtract elements of two matrices. It returns the difference of arr1 and arr2, element-wise.
Python3
# importing numpy as npimport numpy as np # creating first matrixA = np.array([[1, 2], [3, 4]]) # creating second matrixB = np.array([[4, 5], [6, 7]]) print("Printing elements of first matrix")print(A)print("Printing elements of second matrix")print(B) # subtracting two matrixprint("Subtraction of two matrix")print(np.subtract(A, B)) |
Output:
Printing elements of first matrix [[1 2] [3 4]] Printing elements of second matrix [[4 5] [6 7]] Subtraction of two matrix [[-3 -3] [-3 -3]]
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