Arrays - arange()

NumPy - The Basics

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Published Sep 22 2025


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NumPyPython

What np.arange() Does

  • numpy.arange() creates an array with evenly spaced values within a specified range.
  • It’s similar to Python’s built-in range(), but returns a NumPy array instead of a list, and supports non-integer steps (like 0.5).




Function Signature

numpy.arange([start, ]stop, [step], dtype=None)

  • start → (optional) starting value (default = 0).
  • stop → end value (excluded).
  • step → spacing between values (default = 1).
  • dtype → data type of the output array (optional).




Examples

import numpy as np

# Default start=0, step=1
np.arange(5)
# → [0 1 2 3 4]

# Custom start and stop
np.arange(2, 7)
# → [2 3 4 5 6]

# With step
np.arange(1, 10, 2)
# → [1 3 5 7 9]

# With float step
np.arange(0, 1, 0.2)
# → [0. 0.2 0.4 0.6 0.8]

np.arange() is a quick way to create number sequences as NumPy arrays, flexible with integer or float steps.


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