Questions tagged [iteration]
Iteration is the repetition of a block of statements within a computer program, usually with mutable state.
221
questions
4
votes
1answer
53 views
Improving the speed of the injection of class element selectors to HTML tables (sometimes nested) at scale through loop iteration or other methods
Background and Code
I am using the following JavaScript code to inject CSS classes into a webpage after the page has loaded. These classes act as selectors that I can use to pinpoint a table cell to ...
7
votes
4answers
345 views
Finding the first pair of prime numbers that have some specified difference
I tried printing the first pair of prime number in between a list of numbers with a particular difference. But my run time is still too high (for large range of numbers). I want to reduce the run time ...
0
votes
1answer
54 views
Recursively displaying json data on website [closed]
I am displaying the data from a json file onto a website, with recursive and iterative tables side by side. i have the iterative code working, but I have no idea on how to make it recursive.
Here is ...
1
vote
1answer
56 views
Reduce database touches for one to many data pull
I have the following function which works properly and grabs all of the rows from a specific table, then loops through each row to add data related to it as a subarray.
...
2
votes
2answers
54 views
String data manipulated given CSV variables
The Requirements:
List the expensable items sorted by date and location given two variables: 'categories' and 'expenses'. The Categories variable provides the following information in order: Category ...
4
votes
2answers
110 views
Maxcounters in JavaScript
I am trying to solve this question: MaxCounters.
Solving it is straightforward, but solving it fast enough is proving very difficult. How can I improve the performance of this code? At the moment it ...
5
votes
2answers
94 views
Delays using multiple for loops
I got this script which work perfectly but I got some delays because of this 2 for loops [i][j] is there any way to do the same ...
-1
votes
1answer
40 views
Best way of converting a dynamic number of list items into variables in Python [closed]
I have a simple scrapy spider that crawls a page and returns H1 on the pages. Since, each page is unique, one cannot know how many h1's will be on the page. Since the scrapy spider returns a list, I ...
1
vote
1answer
32 views
Iterate over a short list, pairing the elements with the sequential elements of a longer list [closed]
I am a relatively new programmer. I am trying to use iter and cycle to cycle over a list (key) and 'pair' each item with each ...
-3
votes
1answer
22 views
How to convert Recursive Approach to iterative one(Super Reduced String)? [closed]
The Question:
Steve has a string of lowercase characters in range ascii[‘a’..’z’]. He wants to reduce the string to its shortest length by doing a series of operations. In each operation he selects a ...
1
vote
0answers
29 views
conditional simulation(path dependent simulation) in R
My codes are not good, I want to konw how to solve my problem efficicently and learn writing some elegant R codes.Thanks in advance!
"r" is the starting value in ...
2
votes
1answer
22 views
Join ArcGIS tables in Python of plant greenness in response to prior month's rainfall
I am using Python 3.8 with ArcGIS Pro 2.5. This code creates a joined table where I match values for plant greenness in the current month with rainfall X number of months into the past. Each loop ...
3
votes
2answers
715 views
Sliding window iteration in Python
I'm creating a small library of Python utilities, and I'd like feedback on a function which allows iterating over an arbitrary iterable in a sliding-window fashion.
Relevant parts of ...
1
vote
1answer
54 views
Which solution is good to generate a list without None results from a function? [closed]
I'm relatively new to Python and learned, that function cannot return nothing, not even None. In my application I want to iterate over a list and keep all non-...
0
votes
1answer
52 views
Best way to optimize multiple search on Lists java
Anyone could help me to optimize this block of code, I already did a bit improvement but since I'm really bad with this kind of algorithms this all I've done so far. Much appreciate if you can explain ...
2
votes
2answers
77 views
Divide the last element in an array of arrays among the remaining elements
The function below is part of an overall chunk of code to partition an array of size M into sub-arrays of size N. The function in question is written to handle the case: what if M isn't divisible by ...
0
votes
1answer
36 views
2
votes
3answers
49 views
Flagging system: Check for changing values in a data frame
I've written the following code to check if a value in a data frame changes. I'm looking at the last 5 values. If there was no change at all I want my code to return 1, if a single one (or multiple) ...
2
votes
1answer
212 views
Pandas iteration over rows for features calculation
I have a pandas data frame and I want to calculate some features based on some short_window, long_window and ...
1
vote
2answers
78 views
Reduce time taken for VBA loop when copying multiple sets of input values, performing Excel formula calculations and recording results
My VBA code currently loops for 5,000 iterations and takes about 25 minutes to collect the output data in the Output excel sheet. Is there a way to reduce the time taken for instance by improving the ...
3
votes
1answer
215 views
Extracting mail data out of MS Outlook's generic mailbox
This code extract data from generic mailbox mapped by MS Outlook
I failed at recursive iteration in subfolders, so it stays as iterative one.
Added ASCII encoding to deal with crazy national symbols ...
4
votes
4answers
2k views
Forming error messages from a multidimensional associative array
I'm working with an input array, which is 3 levels deep, and creating error message strings accordingly in a separate output array. Below is the code.
...
2
votes
2answers
96 views
Listing last 3 items (or all if less than 3) in an ArrayList
Writing a code to return the last 3 items in a list, if the list has 3 or more elements, otherwise return all list items.
But the code looks really bad.
What is a better way to write the same code?
<...
2
votes
1answer
36 views
Merge adjacent occurrences of identical elements in data collection
There is a small programming exercise to merge adjacent identical elements in a collection.
Here are two solutions (passing the tests from the exercise).
I am asking for review of the first version ...
11
votes
3answers
1k views
Generating sequential alphanumeric values that match a certain pattern
I'm working on generating large volumes of test data for some performance testing. Part of this is going to involve generating a lot of values that represent an "MBI", which is a certain kind of alpha-...
10
votes
4answers
815 views
Shuffling multiple iterators in order
I have a Python function w/ specified functionality, and two proposed approaches - which do you prefer, and why? (performance, simplicity, clarity, etc) (both use ...
7
votes
1answer
232 views
Map unique raw words to a list of code words
Problem
Write a function that replaces the words in raw with the words in code_words such that the first occurrence of each ...
3
votes
1answer
227 views
Nested for-loops in xml parsing
I wrote program that reads and processes xml files submitted by external users. The part of the code in question iterates over xml node's children, appends a dictionary - a future row in a table, and ...
5
votes
1answer
1k views
Finding the closest string match for each string in two dataframe columns
I was wondering what's the fastest method to compare similarity between two lists of strings (e.g. two dataframes, documents etc.) using levenshtein distance or other procedures.
I am currently using:...
3
votes
2answers
156 views
Challenge: phone keypad to letters - return all possible strings
The challenge:
Given a mapping of digits to letters (as in a phone number), and a digit string, return all possible letters the number could represent. You can assume each valid number in the ...
3
votes
3answers
715 views
JavaScript Sort Stack Coding Challenge
A coding challenge to write a function sortStack that receives a stack of integers into ascending order (with largest integers on top) and returns another stack ...
2
votes
1answer
48 views
Traversing two trees until a common value has been found
I am traversing two objects that may share a common ancestor. To make the code small enough to show here, I have changed it into two dictionaries with values. As you can see, ...
3
votes
1answer
90 views
Find a Sum of Particles in A Set of Boxes Given a Number of Rows and Columns
This is a code challenge, from Codewars, the details of the specific challenge in depth can be found here: https://www.codewars.com/kata/magnet-particules-in-boxes/javascript.
The summary of it ...
4
votes
2answers
327 views
JSON selector class in Python
I've created a simple little class called JSONSelector to be able to select relevant data from a JSON object (a dict in Python). ...
11
votes
2answers
551 views
Parallelized for loop in Bash
I am using a Bash script to execute a Python script multiple times. In order to speed up the execution, I would like to execute these (independent) processes in parallel. The code below does so:
<...
2
votes
2answers
327 views
20
votes
5answers
3k views
Count Even Digits In Number
I was asked to complete this CodeStepByStep problem. Here's a quick summary:
Write a function named count_even_digits that accepts two integers as
parameters ...
5
votes
2answers
221 views
Blackjack game: Count Hand Value method
I am almost completing my BlackJack game in Javascript. But I realize that there must be a way to improve the performance for these two methods. Any pointers?
...
1
vote
1answer
47 views
Check if a web element has a specific property and apply changes to the DOM according to the property's existence
I wrote this Javascript snippet for a Polymer fronted, it works without issues.
The only thing that it accomplishes is changing an icon's orientation whenever a user is clicking on any expandable-...
0
votes
1answer
118 views
Grouping objects that have the same attributes
A list of objects needs to be grouped.
The list is iterated and checked with other objects in the same list except itself. The method People.isAttributeEqual() checks if two objects can be grouped.
...
3
votes
2answers
187 views
N-Repeated Element in Size 2N Array
The task
is taken from leetcode
In a array A of size 2N, there are N+1 unique elements, and exactly
one of these elements is repeated N times.
Return the element repeated N times.
...
2
votes
3answers
109 views
Find non-duplicated integer in a list where every integer occurs three times except for one integer
The task
Given an array of integers where every integer occurs three times
except for one integer, which only occurs once, find and return the
non-duplicated integer.
For example, given [6,...
4
votes
1answer
189 views
Walking over a N branching tree
The aim of this code, written in Python3.6, was to write a function that will non-recursively walk over a N-branching tree structure.
It works by using a list of indices that keep track of visited ...
2
votes
2answers
74 views
A Java Iterable over multiple arrays
GlueArrays is used for iterating over an array of arrays, and it looks like this:
Main.java
...
2
votes
2answers
56 views
Iterating through two objects with different structures in parallel
I have two objects, one input = Array<Type> and one stored = Array<{..., Type}>
What's the best (cleanest) way to ...
2
votes
1answer
88 views
Write a function that adds two numbers stored in a linked list and returns the sum
Just for fun I did the following exercise from "Cracking the coding interview. 4th edition":
You have two numbers represented by a linked list, where each node
contains a single digit. The digits ...
3
votes
3answers
133 views
Check if a postcode is in a list
I'm looking for improvement / advice / reviews on how I can improve this code. I feel like there is a better way or more efficient way of doing this and I am over looking it.
The Plugin I made is ...
3
votes
0answers
20 views
IDL code for minimum distance calculation
I made a program in IDL for performing a minimum distance classification on multispectral satellite data. This is what my main function looks like:
...
2
votes
1answer
82 views
Creating objects from xml-data
I've got an XML file with some info about hosts connected to my home network and I would like to create objects containing that info in a neat way, so that I can make some nice front-end application ...
2
votes
0answers
47 views
Speed up iteration for large dataset in python
I'm trying to parse data into a csv prior to a bulk transaction into Neo4j. I'm using vast amounts of data in the relationships and wondered if anyone could help in speeding up the transactions below....
