What is the difference between np.array() and np.asarray()?

python

numpy

array-construction

performance-optimization

byAlex Kataev·Dec 28, 2024

np.array() deep clones your data every time, while np.asarray() is like the memory-wise introvert – avoids copying when possible. Checkmate with an example:

import numpy as np

new_array_with_copy = np.array([1, 2, 3])  # np.array(), the 'always-cloning' squad
new_array_no_copy = np.asarray(new_array_with_copy)  # np.asarray(), the 'copy-avoider'

new_array_with_copy[0] = 99  # Popped the first balloon, but does it affect np.asarray()?
print(new_array_no_copy)  # If it happily says [1, 2, 3], no copy was made!

Like fame and reputation, np.array() is future proof but costly; np.asarray() is thriftier but borrows its future!

The 'When-to-Use-Which' Paradox // Dive Deeper

Adding Drama to Data?: Protective np.array() ensures no original data 'soap opera'.
Memory Freak?: Go for np.asarray(), your pocket-friendly pal with large arrays.
Option Overload?: np.array() is your swiss army knife with more parameters like copy, dtype, order.

The 'Hidden in the Source Code' Saga // Unveil the Magic

The np.asarray() leans on the simpler side – is data already an array or does it need a fancy packing tape? Its less pretentious nature makes it faster and more memory conservative.

And then, you have np.array(). This elderly maestro has been around the block, catering to all whims with arguments like dtype, order, copy.

Jedi Tip: Unwanted nan or inf in the matrix? np.asarray_chkfinite is your star trooper!

The 'Copy Control' Chronicles // Master the Controls !

Invoke ultimate power with np.array()'s copy parameter. Like a genie, it listens to your True (Hey, please clone!) or False (Make a clone? Nah, only if needed!). The introverted np.asarray() silently saves that memory, presuming copy=False, unless, you know, it's really required.

The 'Memory vs Performance' Dilemma // Face the True Challenge

In the land of high-performance, np.asarray() is the magic potion, saving valuable memory when battling heaps of data monsters in a loop. It's less attractive cousin, repeated unnecessary copies, can lock your performance in a dungeon!

The 'Specialized Functions' Theater // Meet the Extended Familia!

Alongside these two heroes, NumPy serves a buffet of specialized dessert tray constructors like np.ascontiguousarray and np.asfortranarray. They whip up arrays with the specific memory layout, ensuring the highest marquee performance.

Lights, Camera, Application:

Want to charm a C/C++ function: present it np.ascontiguousarray.
Flirting with Fortran library: add np.asfortranarray to your charm bracelet.

Task-specific tools await in the arsenal of NumPy. Use them to taste the victory!

Convenience Function Fair // Explore the Quickie Stall!

NumPy adds a dollop of readability with convenience functions like np.copy(). While the twin command np.array(obj, copy=True) might seem verbose, it echoes the intention loud – making a gorgeous copy!

Gear Up: Thrifty np.asarray() minimizes copying, increases the speed limit before operations like:

result = np.asarray(x).sum()  # A thrift shop before summing!

explain-codes / Python / What is the difference between np.array() and np.asarray()?

Linked

Numpy Array Initialization (Fill With Identical Values)



Replace all elements of NumPy array that are greater than some value



Concatenating two one-dimensional NumPy arrays



Convert array of indices to one-hot encoded NumPy array



How do I declare an array in Python?



Check if an array contains any element of another array in JavaScript



What is the purpose of meshgrid in NumPy?



The 'When-to-Use-Which' Paradox // Dive Deeper The 'Hidden in the Source Code' Saga // Unveil the Magic The 'Copy Control' Chronicles // Master the Controls !The 'Memory vs Performance' Dilemma // Face the True Challenge The 'Specialized Functions' Theater // Meet the Extended Familia!Convenience Function Fair // Explore the Quickie Stall!