Questions regarding efficient storing and representing data within a software application.

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1answer
71 views

Data structure for traversing hierarchical hostnames

So, quite often I'll come across a situation where I'd like to process hostnames in a hierarchical manner. For example, given a hostname "foo.bar.baz.example.com", I might want to compare it against ...
5
votes
1answer
1k views

Building a Graph Editor - How to create a data driven graph

I am developing a graph-editor that uses drag and drop to build hierarchical graphs (containing nodes and links). Each node in the graph should be linked to a table in our database (SQL Server). I did ...
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0answers
24 views

PHP Based algorithms for research [on hold]

I am PHP programmer (Experienced ). Now i want to research in PHP algorithms and want to write a paper on a specific PHP algorithm. I need help : From where to start. What should i do . Some ...
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2answers
55 views

Structuring data to represent a tree with squirrels

What I want to represent Let's assume I have several schemas of the following kind: It is a tree on which positions of squirrels are represented by a blue dot. The number of bifurcations differ ...
3
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0answers
156 views

How do personal assistants typically generate sentences?

This is sort of a follow up to this question about NLG research directions in the linguistics field. How do personal assistant tools such as Siri, Google Now, or Cortana perform Natural Language ...
0
votes
1answer
62 views

How to remove a middle element from queue?

I had a question, about how to remove an element from middle of the queue , without disturbing the order of other elements. E.g. Queue before operation:- <| a b c d e |< Queue after ...
4
votes
2answers
91 views

Is it a good idea to have a database row that represents an unknown value within a system

We have two systems, System A imports a list of sports events from system B, it only wants to import the events we will be providing live data for, the filter used to hide events that we are not ...
-1
votes
2answers
73 views

Efficiently save big data structures [closed]

I need to save big data structure (Tree with specific nodes) into file efficiently. Data is always changing, so I need to rewrite whole data structure very often, so simple serialization is not good ...
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2answers
198 views

Traversing an AST using Visitors

I'm writing a compiler for a C-like language, and I'm looking for an elegant way to traverse my abstract syntax tree. I'm trying to implement the Visitor pattern, although I'm not convinced that I'm ...
-1
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1answer
58 views

What are some hashmaps we can easily implement? [duplicate]

At many places, I read that we can use HashMap here for O(1) search. Actually, I want to ask how I can implement easy hashmaps which can satisfy this property. Can anyone tell few hashmaps including ...
2
votes
1answer
75 views

How to make max-heap stable with counter and account for counter overflow?

Generally I need size-efficient data structure similar to std::priority_queue but stable (preserving order of insertion). By adding just 4 bytes to the object I could have 1 byte serving as priority ...
1
vote
1answer
164 views

How to organize points on a sphere in bins and navigate between bins?

I'm having trouble coming up with a suitable way to navigate through a set of star coordinates in the Equatorial Coordinate System. My goal is to display those which are within a given range of ...
2
votes
1answer
226 views

Graph data structures and journal format for mini-IDE

Background: I am writing a small/partial IDE. Code is internally converted/parsed into a graph data structure (for fast navigation, syntax-check etc). Functionality to undo/redo (also between ...
1
vote
1answer
98 views

Where to put data for tree structure which every node requires?

I have a quad-tree structure where each node has some of its own data, but there is also data which applies to the tree as a whole. I'll explain my current solution and I would appreciate feedback on ...
2
votes
2answers
349 views

How to present a stable data model in a public API that allows internal data structures to be changed without breaking the public view of the data?

I am in the process of developing an application that allows users to write C# scripts. These scripts allow users to call selected methods and to access and manipulate data in a document. This works ...
2
votes
1answer
105 views

Data structure well suited for duplicate entries

I'm in the process of getting to know (modern) filesystems. As part of it, I came across log structured filesystems that also handle allocations in a log structured way. I wonder how they handle ...
4
votes
1answer
151 views

Using macros to implement a generic vector (dynamic array) in C. Is this a good idea?

So far I have only done personal projects at home. I hope to get involved in some open source project some time next year. The languages I that have been using the most are C and C++. I have used both ...
0
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0answers
37 views

Global relabeling heuristic: Push-relabel maxflow

I have a correct, working implementation of the preflow-push-relabel maxflow algorithm [2]. I am trying to implement the global relabeling update heuristic [3], but have run into some issues. I have ...
0
votes
1answer
85 views

Block diagram scheme file format

Yesterday I wanted to show my colleague a work flow diagram representing my view on developing our next project. Today I want to display file structure of another my project with includes as a tree ...
2
votes
2answers
107 views

Is embedding data in a executable considered a good practice?

Embedding data (such as images) in a executable seems to have a few advantages, like easier distribution of the executable and easier compatibility with different OSes. But, is it a good practice? ...
4
votes
1answer
179 views

Why define struct in variable?

Consider the following program: Many people when they want to use a struct, they create a new variable as: struct structureName variableName While it works when you just define it as: ...
8
votes
2answers
908 views

Ideal data structure/techniques for storing generic scheduler data in C#

I am trying to implement a generic scheduler object in C# 4 which will output a table in HTML. Basic aim is to show some object along with various attributes, and whether it was doing something in a ...
10
votes
8answers
3k views

Data structure for accessing units of measure

TL;DR - I'm trying to design an optimal data structure to define units within a unit of measure. A Unit of measure is essentially a value (or quantity) associated with a unit. SI Units have seven ...
2
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0answers
46 views

Merge directed acyclic graphs minimizing number of nodes

I have some DAGs (directed acylic graphs) and I want to merge them in order to minimize the number of nodes (we could say that every node has a cost, while edges are free). These four different DAGs ...
0
votes
2answers
92 views

What are the application areas of hash tables or hashing? [closed]

Hashing means generating a record's physical address using its primary key. So it helps in searching a record with least delay. So, any application areas where this concept is used? I suppose most ...
7
votes
3answers
930 views

What is the Bible of Hashing?

Is there a Cormen-like reference on Hashes and Hashing? This particular structure has seen little attention in my CS education for some reason but I'd like to learn more as they seem to be everywhere. ...
3
votes
2answers
210 views

Why Do B+ Trees Have a Minimum Occupancy of 50%?

As far as I can tell, the basic operations (add, delete, search) on a B+ Tree would function the same if minimum occupancy was 1, or 1/3, or any other function on node size. All the sources available ...
0
votes
1answer
140 views

calculating the average of a value over a month [closed]

I am working on a project right now that is having me calculate monthly interest on a bank account. The way the interest is supposed to be calculated is as follows: Use the daily average to calculate ...
0
votes
1answer
45 views

Efficient storing and multidirectional lookup of hierachical data

I make a game and among others I have nations, provinces, tiles and armies. Each army belongs to exactly one tile, each tile belongs to exactly one province, each province to exactly one nation. I ...
2
votes
1answer
303 views

Is using MultiMaps code smell? If so what alternative data structures fit my needs?

I'm trying to model nWoD characters for a roleplaying game in a character builder program. The crux is I want to support saving too and loading from yaml documents. One aspect of the character's is ...
2
votes
2answers
181 views

Most efficient way to store this collection of moduli and remainders?

I have a huge collection of different moduli and associated with each modulus a fairly large list of remainders. I want to store these values so that I can efficiently determine whether an integer is ...
0
votes
1answer
88 views

Handling the process of large-scale lists [closed]

What are the efficient ways to process huge lists (+10 millions), and things to consider while manipulating huge lists. First question, when should I use recursion, and when I shouldn't. In both ...
48
votes
9answers
8k views

How to represent a Rubik's Cube in a data structure

If I am attempting to simulate a Rubik's Cube, how would you create a data structure to store the cube's state in memory, with X number of tiles per side? Things to consider: the cube can be of any ...
-1
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1answer
72 views

How implement a doubly linked list using single pointer inside? [closed]

struct{ int value; int *pointer; } I want to make doubly linked list using the above structure.
0
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1answer
101 views

Method ordering

This is the type of question that one would probably get in an exam, but now it happens to be in the real word. :-) I would appreciate some advice regarding the datastructure/algorithm that can be ...
1
vote
1answer
40 views

Is it a good idea to use bloom filters for this scenario?

I have a theoretical social network where two people, A & C, can become friends if and only if, they have a common friend B amongst them. The simplest solution is to iterate over the two lists ...
0
votes
1answer
292 views

Find possible variations of one item out of multiple baskets.

I have three baskets of balls and each of them has 10 balls which have the following numbers: Basket 1: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 Basket 2: 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 ...
0
votes
0answers
39 views

Arduino ADC value and practices to store data to buffer

I'm writing Arduino application which has timer interrupt to acquire ADC value. Main loop has serial transmission procedure to send data from buffer. I'm not sure how to store data in buffer. Best ...
0
votes
1answer
95 views

What is a good way to store geographical data for distance calculations

What would be the best way to store data in a database for geographical calculations? Say I have an ItemsForSale table paired to a Users table which holds their geo location. I know I can use latitude ...
1
vote
3answers
201 views

Database design: 4 types of users but have different functionality , separate or one table?

I have 4 types of users: Admins , normal user , company , service provider admins and normal user share some attributes (id .first name ,last name ,phone ,mail) company and service provider share ...
3
votes
2answers
91 views

Process to generate hierarchical structure based on relational data?

I have a csv of employee ids, names, and a reference column with the id of their direct manager, say something like this emp_id, emp_name, mgr_id 1,The Boss,, 2,Manager Joe,1 3,Manager Sally,1 ...
2
votes
1answer
105 views

Data structures and algorithms for a directed rooted tree with inherited properties?

I need to represent a directed rooted tree in memory. The caveat is, that nodes have properties. And those properties are inherited (but not 100%) by the child nodes, recursively. What would be a ...
1
vote
1answer
95 views

Best approach to a defined datastructure

I have a plain text file with some data that I can't change, so I have to create a datastructure to use in reading the file and with that datastructure do some thousands of interactions. The file ...
3
votes
0answers
162 views

Lightweight data modeling vs traditional classes [closed]

I've heard a lot of talk about using lightweight data modeling as of late. Especially in relation to the Clojure programming language. What is it and how it differs from traditional classes regarding ...
2
votes
1answer
50 views

BloomFilter in ruby should have k hash functions

I am reading the Bloom Filter implementation written in ruby. It should have k hash functions, but it looks like the same hash function is being used with different seed values. Is this a common way ...
0
votes
1answer
35 views

What would be the return type of a cartesian product of a multiset

I am writing a Multiset in Ruby. The Union, Intersection operations where simple and return a MultiSet. But, I am not sure what the return type of the cartesian product should be, should I return an ...
1
vote
3answers
227 views

Pattern / methodology for representing large database records as objects

A bit of background information: We have an old database application written in Access that lets users monitor their workload, and the code is... 'procedural' might be too kind. The vast majority of ...
1
vote
3answers
1k views

Programming language with pattern matching in trees [closed]

I'd like to prototype a computer algebra system. An equation would be represented by a tree and rules would be defined - similarly to mathematical axioms - by specifying a pattern (in the tree) and a ...
4
votes
2answers
187 views

Decimal vs. Integer; Given a fixed range of values, which is preferable for accurate computation?

After getting into a "heated discussion" with someone, I figured I'd ask this question for the sake of posterity. I'm willing to be corrected if my assumption is incorrect but I'd like to hear a ...
8
votes
3answers
692 views

Clean Code and Hybrid Objects and Feature Envy

So I recently made some major refactorings to my code. One of the main things I tried to do was split out my classes into data objects and worker objects. This was inspired, among other things, by ...