NumPy: Swap rows and columns of a given array in reverse order
NumPy: Basic Exercise-58 with Solution
Write a NumPy program to swap rows and columns of a given array in reverse order.
Sample Solution:
Python Code:
import numpy as np
nums = np.array([[[1, 2, 3, 4],
[0, 1, 3, 4],
[90, 91, 93, 94],
[5, 0, 3, 2]]])
print("Original array:")
print(nums)
print("\nSwap rows and columns of the said array in reverse order:")
new_nums = print(nums[::-1, ::-1])
print(new_nums)
Sample Output:
Original array: [[[ 1 2 3 4] [ 0 1 3 4] [90 91 93 94] [ 5 0 3 2]]] Swap rows and columns of the said array in reverse order: [[[ 5 0 3 2] [90 91 93 94] [ 0 1 3 4] [ 1 2 3 4]]] None
Python-Numpy Code Editor:
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Previous: Write a NumPy program to create a 4x4 array, now create a new array from the said array swapping first and last, second and third columns.
Next: Write a NumPy program to multiply two given arrays of same size element-by-element.
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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
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