Numpy Dynamic Array

Dynamically resizing Numpy array.

A dynamic array expands as you add more elements. So you don't need to determine the size ahead of time. The version present here is focused on being compatible with the typical Numpy indexing and functions.

Installation

For python >=3.9

pip install numpy_dynamic_array

For python 3.7-3.9, directly install from the python37 branch with

pip install https://github.com/dylanwal/numpy_dynamic_array/archive/python37.zip

Usage

Basics

import numpy as np
from numpy_da import DynamicArray

data = DynamicArray(shape=2)
a = np.linspace(0, 9, 10)
data.append(a)  # requires resize (done automatically)

print(data)  # [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

Indexing

Setting values with indexing

data = DynamicArray(shape=2)
data.append(np.linspace(0, 9, 10))
data[3] = 40
print(data)  # [0, 1, 2, 3, 40, 5, 6, 7, 8, 9]

Setting values with indexing (outside current array size) Set index_expansion=True

data = DynamicArray(shape=2, index_expansion=True)
data[5] = 1
print(data)  # [0, 0, 0, 0, 0, 1]

Setting values with slices (outside current array size) Set index_expansion=True

data = DynamicArray(shape=2, index_expansion=True)
data[5:8] = [1, 2, 3]
print(data)  # [0, 0, 0, 0, 0, 1, 2, 3]

Operators

Equality:

np_array = np.linspace(0, 9, 10)
data = DynamicArray()
data.append(np_array)
print(all(data == np_array))  # True

Addition:

np_array = np.linspace(0, 9, 10)
data = DynamicArray()
data.append(np_array)
print(all((data + 7.5) == (np_array + 7.5)))  # True

Other supported oparators:

floordiv (//)
mod (%)
mul (*)
neg (-)
pow (**)
truediv(/)
sub (-)
len (len())

Numpy Functions

np_array = np.linspace(0, 9, 10)
data = DynamicArray()
data.append(np_array)
print(data.max())  # 9

np_array = np.linspace(0, 9, 10)
data = DynamicArray()
data.append(np_array)
print(np.abs(data - 5))  # [5. 4. 3. 2. 1. 0. 1. 2. 3. 4.]

Multidimensional arrays

Use the shape to specify initial ndarray with correct dimensions.

data = DynamicArray(shape=(2, 2))  # requires resize
a = np.linspace(0, 9, 10).reshape(5, 2)
data.append(a)

For more examples look at the tests folder.

dylanwal / numpy_dynamic_array