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    A 1-D array is a linear collection of elements stored in a single row. In Python, the most common way to create one is by using NumPy, which offers multiple methods for different use cases.

    Example:

    import numpy as np

    # Creating a 1-D array from a Python list
    arr = np.array([1, 2, 3, 4, 5])
    print(arr) # Output: [1 2 3 4 5]
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    Using np.array() Converts a Python list, tuple, or other sequence into a NumPy array.

    arr = np.array((10, 20, 30))
    print(arr) # [10 20 30]
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    This is the most flexible method and allows specifying dtype for memory optimization.

    Using np.arange() Generates evenly spaced values within a range.

    arr = np.arange(0, 10, 2)
    print(arr) # [0 2 4 6 8]
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    Best for integer sequences or fixed step sizes.

    Using np.linspace() Creates evenly spaced numbers between two limits.

    arr = np.linspace(1, 5, num=5)
    print(arr) # [1. 2. 3. 4. 5.]
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    Useful when you know the number of elements needed.

    Using np.zeros() and np.ones() Creates arrays filled with zeros or ones.

    zeros_arr = np.zeros(5)
    ones_arr = np.ones(5)
    print(zeros_arr) # [0. 0. 0. 0. 0.]
    print(ones_arr) # [1. 1. 1. 1. 1.]
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    How to convert a 1-dimensional array into a 2D array?

    start += 1 new.append(temp) ("new values for uneven cases: ", new) numpy np ("Original array : \n", array) ("New array : \n", array) I want to convert a 1-dimensional array into a 2-dimensional array by specifying the number of columns in the 2D array. Something that would work like this: > import numpy as np > A = np.arr...

    stackoverflow.com
    Stack Overflow
    https://stackoverflow.com/questions/12575421
    Convert a 1D array to a 2D array in numpy - Stack Overflow
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  1. NumPy
    https://numpy.org › doc › stable › user › basics.creation.html

    Array creation — NumPy v2.4 Manual

    numpy.diag can define either a square 2D array with given values along the diagonal or if given a 2D array returns a 1D array that is only the diagonal elements.

    • Array types and conversions between types # NumPy supports a much greater …

    • The term broadcasting describes how NumPy treats arrays with different …

    • NumPy fundamentals # These documents clarify concepts, design decisions, and …

    • Assigning data to a structured array # There are a number of ways to assign values to …

    • The array interface protocol # The array interface protocol defines a way for array …

    • What is NumPy? # NumPy is the fundamental package for scientific …

    See results only from numpy.org
  2. GeeksForGeeks
    https://www.geeksforgeeks.org › python

    Using 2D arrays/lists in Python - GeeksforGeeks

    Dec 20, 2025 · A 2D list in Python is essentially a list of lists, commonly used to store data in a table-like format with rows and columns. This article focuses on correct …

  3. Python Guides
    https://pythonguides.com

    How To Create A 2D Array In Python?

    Jan 1, 2025 · In this tutorial, I will explain how to create and manipulate 2D arrays in Python. I explored various ways to achieve this task, I will show important methods …

  4. Videos of Create 2D Array Using 1D in Python

  5. Stack Overflow
    https://stackoverflow.com › questions

    Convert a 1D array to a 2D array in numpy - Stack Overflow

    Sep 25, 2012 · I want to convert a 1-dimensional array into a 2-dimensional array by specifying the number of columns in the 2D array. Something that would work like this: > import numpy as np > A = …

  6. AskPython
    https://www.askpython.com › python › array › multidimensio…

    Multidimensional Arrays in Python: A Complete Guide

    Feb 27, 2023 · In this article, the creation and implementation of multidimensional arrays (2D, 3D as well as 4D arrays) have been covered along with examples in …

  7. Python Examples
    https://pythonexamples.org

    Create 2D Array in NumPy - Python Examples

    Learn how to create a 2D array in Python using NumPy. Explore various methods like array (), zeros (), ones (), and empty () to easily initialize 2D arrays with different values and shapes.

  8. w3reference.com
    https://www.w3reference.com › blog › pythonic-way-to-create-a-numpy-array...

    Pythonic Way to Create a 2D NumPy Array from a List of 1D Arrays …

    Dec 6, 2025 · Whether you’re handling uniform or variable-length 1D arrays, you’ll learn how to create clean, performant 2D arrays that integrate seamlessly with downstream numerical workflows.

  9. Codecademy
    https://www.codecademy.com › article › numpy-arrays-guide

    Creating and Using NumPy Arrays - A Complete Guide

    In this guide, we’ll explore the benefits of using NumPy over Python lists, creating 1D, 2D, and 3D arrays, performing arithmetic operations, and applying indexing, slicing, …

  10. w3resource
    https://www.w3resource.com › python-exercises › numpy

    NumPy: Convert two 1-D arrays into a 2-D array

    Aug 29, 2025 · Write a NumPy program to merge two 1D arrays into a 2D array along a new depth axis using np.dstack. Stack two 1D arrays depth-wise and verify that …

  11. Programiz
    https://www.programiz.com › python-programming › numpy › ndarray-creation

    NumPy N-D Array Creation (With Examples) - Programiz

    For example, a 2D array represents a table with rows and columns, while a 3D array represents a cube with width, height, and depth. There are multiple techniques to create N-d arrays in NumPy, and we …

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