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NumPy: Find the number of rows and columns of a given matrix

NumPy: Basic Exercise-26 with Solution

Write a NumPy program to find the number of rows and columns of a given matrix.

Sample Solution :

Python Code :

import numpy as np
m= np.arange(10,22).reshape((3, 4))
print("Original matrix:")
print(m)
print("Number of rows and columns of the said matrix:")
print(m.shape)

Sample Output:

Original matrix:
[[10 11 12 13]
 [14 15 16 17]
 [18 19 20 21]]
Number of rows and columns of the said matrix:
(3, 4)

Pictorial Presentation:

NumPy: Find the number of rows and columns of a given matrix.

Python-Numpy Code Editor:

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Previous: Write a NumPy program to create a 3x4 matrix filled with values ​​from 10 to 21.
Next: Write a NumPy program to create a 3x3 identity matrix, i.e. diagonal elements are 1, the rest are 0.

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m