NumPy: Create a three-dimension array with shape (3,5,4) and set to a variable
NumPy: Basic Exercise-56 with Solution
Write a NumPy program to create a three-dimension array with shape (3,5,4) and set to a variable.
Sample Solution:
Python Code:
import numpy as np
nums = np.array([[[1, 5, 2, 1],
[4, 3, 5, 6],
[6, 3, 0, 6],
[7, 3, 5, 0],
[2, 3, 3, 5]],
[[2, 2, 3, 1],
[4, 0, 0, 5],
[6, 3, 2, 1],
[5, 1, 0, 0],
[0, 1, 9, 1]],
[[3, 1, 4, 2],
[4, 1, 6, 0],
[1, 2, 0, 6],
[8, 3, 4, 0],
[2, 0, 2, 8]]])
print("Array:")
print(nums)
Sample Output:
Array: [[[1 5 2 1] [4 3 5 6] [6 3 0 6] [7 3 5 0] [2 3 3 5]] [[2 2 3 1] [4 0 0 5] [6 3 2 1] [5 1 0 0] [0 1 9 1]] [[3 1 4 2] [4 1 6 0] [1 2 0 6] [8 3 4 0] [2 0 2 8]]]
Python-Numpy Code Editor:
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Previous: Write a NumPy program to create an array of equal shape and data type of a given array.
Next: 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.
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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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