Python: Creating multidimensional arrays with unspecified dimensions

Last update on April 23 2025 12:50:51 (UTC/GMT +8 hours)

6. Ellipsis in Multidimensional Array

Write a Python program that uses 'Ellipsis' to create a multidimensional array with unspecified dimensions.

Sample Solution:

Code:

import numpy as np
# Create a multidimensional array with unspecified dimensions
nums = np.array([[[1, 2], [3, 4]], [..., ...], [[5, 6], [7, 8]]])
# Print the array
print(nums)

Output:

[[list([1, 2]) list([3, 4])]
 [Ellipsis Ellipsis]
 [list([5, 6]) list([7, 8])]]

In the exercise above, we use 'ellipsis (...)' to represent unspecified dimensions in a NumPy array. The resulting array contains 'ellipsis' as placeholders for dimensions not explicitly specified. In this way, we can create multidimensional arrays without having to specify all dimensions in advance.

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python program to create a NumPy array and then use Ellipsis in slicing to extract a subarray that includes all dimensions except the first.
Write a Python script to demonstrate the use of Ellipsis in indexing a 4D NumPy array to obtain a 2D slice.
Write a Python function that takes a multidimensional NumPy array and returns a slice from the second dimension onward using Ellipsis.
Write a Python program to create a 3D NumPy array and use Ellipsis to select all elements in the last two dimensions, then print the result.

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Previous: Python Program: Checking and handling ellipsis in variables.
Next: Generating sequences with ellipsis in Python.

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