All Questions
Tagged with python-itertools arrays
60 questions
0
votes
2
answers
118
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Comparing Columns , Arrays, List using SQL, Numpy or Python List. Would Intertools be valid alternative and faster?
I have two table in SQL
tModel which has 9 columns (ID, Date N1, N2, N3, N4, N5, N6, Flag) and 300 million rows
tPairAP which has 3 columns (ID, N1, N2) and 750 rows
The task I need to to perform is ...
- 327
1
vote
1
answer
137
views
Efficiently find full row permutations in 2d array having repeated row pairs
Consider the array:
import numpy as np
import numpy_indexed as npi
from itertools import permutations
arr = np.array([[1, 2, 3, 4],
[3, 3, 3, 6],
[2, 0, 0, 2],
...
- 704
0
votes
0
answers
48
views
Combining group of arrays and minimize resulting negative elements
Problem:
Given a set of G groups, each of them with a set of n_i
int-arrays with a fixed length t:
Find the combinations of arrays (variable length, from 1 to G), so the
resulting sum-array contains ...
1
vote
2
answers
66
views
How to group items in list in python if the value change? [duplicate]
Suppose I have a list
msg_type =["sent-message", "received-message", "received-message", "sent-message", "received-message", "sent-message", ...
- 166
0
votes
1
answer
100
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Python 3sum solution using itertools module exceeds time limit
Given an integer array nums, return all the triplets [nums[i], nums[j], nums[k]] such that i != j, i != k, and j != k, and nums[i] + nums[j] + nums[k] == 0.
Notice that the solution set must not ...
0
votes
2
answers
162
views
How do I implement a python dictionary with combinations so that it returns keys as indices and values as the value of the element?
I'm trying to find 2 numbers(n=2) in the array that add up to 3 and print the tuple. In this example the output should be {0:1,1:2}. Currently I have the output to be true or false but I want it to ...
- 1
3
votes
3
answers
3k
views
Create all possible combinations of lists of different sizes in numpy
I want to create a numpy array with all possible combinations of items from multiple lists of different sizes:
a = [1, 2]
b = [3, 4]
c = [5, 6, 7]
d = [8, 9, 10]
In each combination, I want 2 ...
- 425
0
votes
1
answer
161
views
Insert 1D array into a 2D array
I am trying to insert a column into a 2D array.
Currently I have a 2D array generated using itertools.
sample_points=[-1.5, -.8]
base_points = itertools.combinations_with_replacement(sample_points, 3)
...
- 261
2
votes
1
answer
338
views
Use dask for an out of core conversion of iterable.product into a numpy/dask array (create a matrix of every permutation with repetition)
I am looking to create a matrix (numpy array of numpy arrays) of every permutation with repetition (I want to use it for matrix multiplication later on). Currently the way I am doing it, I first ...
- 73
3
votes
1
answer
3k
views
How to get all combination for a given sum with a given number of elements
I have a list of list of floats like this
numbers = [0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9]
I want a python code that can generate all possible combinations for given sum (=1) and a given number of ...
- 141
1
vote
2
answers
98
views
Differences in an array based on groups defined by another array
I have two arrays of the same size. One, call it A, contains a series of repeated numbers; the other, B contains random numbers.
import numpy as np
A = np.array([1,1,1,2,2,2,0,0,0,3,3])
B = np.array([...
- 13
0
votes
1
answer
26
views
Is there another different way of printing a cartesian product in a dictionary which has arrays as values following an specific order on Python?
Let's say I have the following dictionary:
the_dictionary_list = {'Color': ['Amarillo.png', 'Blanco.png', 'Rojirosado.png', 'Turquesa.png', 'Verde_oscuro.png', 'Zapote.png'],
'...
- 875
0
votes
1
answer
2k
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How can I obtain all combinations of my list?
I am attempting to create an array with all the possible combinations of two numbers.
My array is [0, 17.1]
I wish to obtain all the possible combinations of these two values in a list of 48 elements ...
- 389
0
votes
2
answers
1k
views
All Possible Combinations from an array with boundary conditions in Python?
I have a list of 4 items, and I would like to find all possible combinations of these 4 items for a given array length. Ex: if I specify that I want the length to be 16, I want to generate all ...
2
votes
1
answer
482
views
Retrieve all possible combinations of ascending integers from sublists
I have lists containing sublists. From theses lists I want to retrieve all combinations of integers that are in ascending order. Also the order of the sublists is important (see expected output).
It ...
- 998