All Questions
8 questions
2
votes
1
answer
140
views
Returning all divisors of a number as a matrix with N X 2 dimensions
I have developed a class structure with methods to return a matrix from a single input array. The objective is to insert the middle value of the array so 2n remains ...
- 23
2
votes
2
answers
800
views
Finding distance between vectors of matrices
So here is the problem:
Given 2D numpy arrays 'a' and 'b' of sizes n×m and k×m
respectively and one natural number 'p'. You need to find the
distance(Euclidean) of the rows of the matrices 'a' and ...
- 315
7
votes
1
answer
214
views
Computing sums of weird pattern in 2D array as efficiently as possible
This is a problem from Hackerrank (https://www.hackerrank.com/challenges/2d-array/problem). We're given a 6x6 (always) 2D array and asked to compute the sums of all the hourglass patterns in the array....
- 1,159
3
votes
1
answer
54
views
How to optimize code to take advantage of NumPy broadcasting when calculating pairwise correlation?
I'm trying to take advantage of NumPy broadcasting and backend array computations to significantly speed up this function. Unfortunately, it doesn't scale so well so I'm hoping to greatly improve the ...
- 201
2
votes
1
answer
2k
views
Rotate matrix 90 degrees
I recently did problem 1.7 Rotate Matrix in Cracking the Coding Interview. I realized my code is very different than what is in the book and also from what I'm finding online (I'm having trouble ...
- 121
5
votes
1
answer
2k
views
Extending numpy array by replacing each element with a matrix
Suppose I have a H*W numpy array like this (H=3 and W=2):
...
- 621
5
votes
1
answer
1k
views
Improving the manipulation of 2D Arrays for an easy challenge on HackerRank with Python 3
I am practicing some exercises on HackerRank in order to improve my skills on Python3. I am doing the 30 days challenge. There is one challenge involving matrices. I was able to pass the test cases ...
user122340
0
votes
2
answers
2k
views
Effective Python 2/3 two-dimensional array initialisation
Recently I noticed that the idiomatic python two-dimensional array initialisation is extremely slow. I am wondering, is there a good, proper way of doing this simple task fast? Also, are those two ...
- 201