62
votes
5
answers
564
views
What are the differences between numpy arrays and matrices? Which one should I use?
What are the advantages and disadvantages of each? From what I've seen, either one can work as a replace
65
votes
8
answers
415
views
Numpy array dimensions
I'm currently trying to learn Numpy and Python. Given the following array: import numpy as np a = np.arr
48
votes
15
answers
435
views
Sorting arrays in NumPy by column
How can I sort an array in NumPy by the nth column? For example, a = array([[9, 2, 3], [4, 5, 6],
65
votes
5
answers
2.6K
views
What are the advantages of NumPy over regular Python lists?
What are the advantages of NumPy over regular Python lists? I have approximately 100 financial markets series
54
votes
17
answers
1.3K
views
Is there a NumPy function to return the first index of something in an array?
I know there is a method for a Python list to return the first index of something: >>> l = [1, 2, 3]
47
votes
8
answers
1.7K
views
How to access the ith column of a NumPy multidimensional array?
Suppose I have: test = numpy.array([[1, 2], [3, 4], [5, 6]]) test[i] gets me ith line of the array (eg [1,
62
votes
15
answers
747
views
Convert pandas dataframe to NumPy array
I am interested in knowing how to convert a pandas dataframe into a NumPy array. dataframe: import numpy as
47
votes
11
answers
453
views
Dump a NumPy array into a csv file
Is there a way to dump a NumPy array into a CSV file? I have a 2D NumPy array and need to dump it in human-rea
57
votes
21
answers
1.9K
views
How to print the full NumPy array, without truncation?
When I print a numpy array, I get a truncated representation, but I want the full array. Is there any way to
58
votes
14
answers
2.8K
views
64
votes
14
answers
336
views
How do I concatenate or merge arrays in Swift?
If there are two arrays created in swift like this: var a:[CGFloat] = [1, 2, 3] var b:[CGFloat] = [4, 5, 6]
54
votes
23
answers
2.1K
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How to find index of list item in Swift?
I am trying to find an item index by searching a list. Does anybody know how to do that? I see there is list
62
votes
17
answers
972
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How to check if an element is in an array
In Swift, how can I check if an element exists in an array? Xcode does not have any suggestions for contain, i
53
votes
18
answers
2.6K
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Swift how to sort array of custom objects by property value
lets say we have a custom class named imageFile and this class contains two properties. class imageFile {
58
votes
30
answers
1.9K
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Split a String into an array in Swift?
Say I have a string here: var fullName: String = "First Last" I want to split the string base on white spac
56
votes
16
answers
1.2K
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How to iterate a loop with index and element in Swift
Is there a function that I can use to iterate over an array and have both index and element, like Python'
54
votes
8
answers
412
views
PHP - Merging two arrays into one array (also Remove Duplicates)
Hi I'm Trying to merge two arrays and also want to remove duplicate values from final Array. Here is my
61
votes
6
answers
2.1K
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How are multi-dimensional arrays formatted in memory?
In C, I know I can dynamically allocate a two-dimensional array on the heap using the following code: int** s
63
votes
4
answers
2.3K
views
Why do we use arrays instead of other data structures?
As I was programming, I haven't seen an instance where an array is better for storing information than an
50
votes
30
answers
2.9K
views
Array versus linked-list
Why would someone want to use a linked-list over an array? Coding a linked-list is, no doubt, a bit more work
