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Creating a Matrix using Rows | Linear Algebra using Python

Linear Algebra using Python | Creating a Matrix using Rows: Here, we are going to learn how to create a matrix using rows in Python?
Submitted by Anuj Singh, on May 14, 2020

In the python code, we will build a matrix using rows. We can stack two arrays to form a matrix only and only if both the arrays/rows have the same dimensions. The following code shows how an inbuilt vstack() function can be used to stack three rows to form a matrix.

Python code for creating a matrix using rows

# Creating a Matrix using Rows

import numpy as np

#Use of np.array() to define rows
V1 = np.array([45,78,65,99])
V2 = np.array([68,87,97,48])
V3 = np.array([74,68,77,48])

print("The Row v1: ",V1)
print("The Row v2: ",V2)
print("The Row v3: ",V3)

#Making a Matrix using Vectors
M = np.vstack([V1,V2,V3])

print("\n\n -----Matrix M---\n", M)
print("\n\nShape of the matrix B: ", M.shape)

Output:

The Row v1:  [45 78 65 99]
The Row v2:  [68 87 97 48]
The Row v3:  [74 68 77 48]


 -----Matrix M---
 [[45 78 65 99]
 [68 87 97 48]
 [74 68 77 48]]


Shape of the matrix B:  (3, 4)