Python
Python is a dynamic, strongly typed, object-oriented, multipurpose programming language, designed to be quick (to learn, to use, and to understand), and to enforce a clean and uniform syntax. Two similar but incompatible versions of Python are in use (Python 2.7 or 3.x). For version-specific Python questions, please also use the [python-2.7] or [python-3.x] tags. When using a Python variant (Jython, Pypy, Iron-python, etc.) - please also tag the variant.
53
votes
5
answers
2.6K
views
What is the difference between ndarray and array in numpy?
What is the difference between ndarray and array in Numpy? And where can I find the implementations in the num
57
votes
8
answers
376
views
Most efficient way to reverse a numpy array
Believe it or not, after profiling my current code, the repetitive operation of numpy array reversion ate a gi
61
votes
20
answers
2.9K
views
Saving a Numpy array as an image
I have a matrix in the type of a Numpy array. How would I write it to disk it as an image? Any format works
58
votes
6
answers
1.9K
views
Concatenating two one-dimensional NumPy arrays
I have two simple one-dimensional arrays in NumPy. I should be able to concatenate them using numpy.concatenat
47
votes
17
answers
2.5K
views
How do I check which version of NumPy I'm using?
How can I check which version of NumPy I'm using? (FYI this question has been edited because both the qu
50
votes
7
answers
1.3K
views
Comparing two NumPy arrays for equality, element-wise
What is the simplest way to compare two NumPy arrays for equality (where equality is defined as: A = B iff for
62
votes
23
answers
2.8K
views
What does axis in pandas mean?
Here is my code to generate a dataframe: import pandas as pd import numpy as np dff = pd.DataFrame(np.random
64
votes
14
answers
1.7K
views
NumPy array is not JSON serializable
After creating a NumPy array, and saving it as a Django context variable, I receive the following error when l
62
votes
8
answers
1.2K
views
How to convert a PIL Image into a numpy array?
Alright, I'm toying around with converting a PIL image object back and forth to a numpy array so I can do
51
votes
4
answers
1.3K
views
How to convert 2D float numpy array to 2D int numpy array?
How to convert real numpy array to int numpy array? Tried using map directly to array but it did not work.
54
votes
3
answers
2.6K
views
What is the difference between flatten and ravel functions in numpy?
import numpy as np y = np.array(((1,2,3),(4,5,6),(7,8,9))) OUTPUT: print(y.flatten()) [1 2 3 4 5 6
60
votes
9
answers
1.3K
views
Creating a Pandas DataFrame from a Numpy array: How do I specify the index column and column headers?
I have a Numpy array consisting of a list of lists, representing a two-dimensional array with row labels and c
53
votes
13
answers
2.3K
views
Converting between datetime, Timestamp and datetime64
How do I convert a numpy.datetime64 object to a datetime.datetime (or Timestamp)? In the following code, I cr
65
votes
6
answers
1.5K
views
What is the difference between Numpy's array() and asarray() functions?
What is the difference between Numpy's array() and asarray() functions? When should you use one rather th
52
votes
5
answers
608
views
Converting NumPy array into Python List structure?
How do I convert a NumPy array to a Python List (for example [[1,2,3],[4,5,6]] ), and do it reasonably fast?
55
votes
17
answers
3.1K
views
How to add an extra column to a NumPy array
Let’s say I have a NumPy array, a: a = np.array([ [1, 2, 3], [2, 3, 4] ]) And I would like
55
votes
15
answers
782
views
How do I create an empty array/matrix in NumPy?
I can't figure out how to use an array or matrix in the way that I would normally use a list. I want to c
54
votes
7
answers
1.3K
views
Difference between numpy.array shape (R, 1) and (R,)
In numpy, some of the operations return in shape (R, 1) but some return (R,). This will make matrix multiplica
53
votes
14
answers
1.8K
views
How to pretty-print a numpy.array without scientific notation and with given precision?
I'm curious, whether there is any way to print formatted numpy.arrays, e.g., in a way similar to this: x
61
votes
11
answers
1.4K
views
What does numpy.random.seed(0) do?
What does np.random.seed do in the below code from a Scikit-Learn tutorial? I'm not very familiar with Nu
