Data are values of qualitative or quantitative variables, belonging to a set of items. Data in computing (or data processing) are represented in a structure, often tabular (represented by rows and columns), a tree (a set of nodes with parent-children relationship) or a graph structure (a set of ...

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0
votes
1answer
73 views

Full signed part of two complement long [closed]

I am reverse engineering a data file (from a synthesizer). It seems that e.g. -1 is written as FF FF FF FF, so in four bytes. while +1 is written as 00 00 01 (--), so only three bytes. Is something ...
1
vote
4answers
601 views

Best datatype to store a ternary, or three-state variable

Disclaimer: I know that datatypes are a little bit subjective to which scripting/programming language you are using, I like to write in Python as a matter of preference; though I am happy to hear ...
-1
votes
1answer
97 views

Choosing a file format to storage a simple text data [closed]

My .NET application makes its work and then creating a report (an Excel worksheet). The report holds thousands of short text strings [KEY - VALUE], so excel worksheets suites very well, one column ...
5
votes
1answer
164 views

Is there a standard way of cleaning data files?

Having spent quite a lot of time working in software companies that deal in medium to large data sets, I've seen that a choke point in their processes is often prepping data files for loading into ...
1
vote
1answer
27 views

Format for getting clear directions on data paramters from users

As part of my job, I regularly get ad-hoc requests from users for snapshots of our very large database. However, there's no fixed format for delivering these and they usually come through in the form ...
0
votes
0answers
42 views

Efficiently storing and parsing client's browser details

Do there exist browser fingerprinting API's that instead of running browser information (e.g. the user agent, installed plugins, screen resolution, system fonts etc.) through a hash function, instead ...
0
votes
0answers
76 views

Converting large files in python

I have a few files that are ~64GB in size that I think I would like to convert to hdf5 format. I was wondering what the best approach for doing so would be? Reading line-by-line seems to take more ...
2
votes
0answers
2k views

How to parse multipart field/file data separately?

I want to parse a multipart form twice: Once to grab the incoming fields, and later to process the file upload. I am trying to maintain a proper separation of concerns within my Node app: ...
1
vote
0answers
31 views

versioning data schema in android internal storage

I am using Android's internal storage to hold data for my application and I am trying to find a good way to handle reading data of an older schema. For example, let's say I have serialized and written ...
1
vote
0answers
601 views

What are the bad points of using Core Data for iOS like an ORM

I just starting to use Core Data for my iOS app and I am thinking about how use Core Data for my needs. What are the features of my app: The user look for products proposed from a catalog. The user ...
0
votes
1answer
87 views

Persisting type in Java - should I be using flags?

Is there some specific piece of advice around persist values that indicate type? Specifically I want to know if I should persist a flag/state indicating the type in persistence or not. I get the ...
2
votes
0answers
428 views

using flat file vs sqlite db for frequent data grabbing in a cron job

I have some automated task to be done using certain types of logs generated on the server end of each day. Log files contains specific machine identification "MAC" that is to be re-written in to ...
0
votes
2answers
120 views

How to design this better?

I'm developing a system using .NET which will be used by multiple users. Because of that, I need to identify on the database which data belongs to each user. Explaining with an example, imagine I have ...
0
votes
3answers
118 views

Looking for a certain datatype if it exists

I'm looking for the kind of a certain datatypes. The main idea of this datatype is to describe a productionline containing several steps. Each step should be represented as a "vertex" containing an ...
4
votes
1answer
61 views

Deleting Content from Service [closed]

I'm not quite sure what the real practice is in the programming community. But when a user deletes content from your service (ie. deleting a status update, a photo of theirs, a comment they made). ...
0
votes
1answer
86 views

Place measurement data in database (access)

In a software I use records of measurement data. Each record contains basic information like a name, some parameters and the actual measurement data in the form of three arrays of double values that ...
4
votes
1answer
394 views

Should reflection be part of design?

I'm currently designing a somewhat large program that will involve the simulation of math/physics models and collection of data (I have not implemented any code yet). One of the main problems I'm ...
0
votes
1answer
175 views

scipy.stats.percentileofscore() wrong?

i'm a data scientist and python noob, but I seem to have found a bug with scipy.stats.percentileofscore. it may be "by design" but please bear with me. if you have an array, you will get an upper ...
2
votes
3answers
347 views

Building presentation layer directly on data layer

My application is currently quite a mess and I'm trying to untangle it all. My current idea is that I should have 3 separate layers: data layer that knows how to keep stuff in database (and handle ...
3
votes
2answers
196 views

What is a scalable and practical way to search existence of a group of strings in a huge file

Context: I built an app which generates around 1000 domain names based on user input. I need to check if they are available or not by matching against a huge zone file of parsed domain names which is ...
1
vote
2answers
88 views

Test Data in a Distributed System

A question that has been vexing me lately has been about how to effectively test (end-to-end) features in a distributed system. Particuarly, how to effectively manage (through time) test data for ...
0
votes
0answers
31 views

What data should QR-Code contain to serve both my own and external QR-Code reader

My webapplication uses codes (in form of http://www.url.com/code/105820582020204), that I want to encode as QR-Code. I assume that such generated QR-Code will be scanned by both people using my mobile ...
4
votes
3answers
299 views

Big Data: Can it be pre-processed?

My question is about "big data". Basically, big data involves the analysis of a large amount of data to make meaningful insights from it. I would like to know: Whether or not large amounts of data ...
0
votes
2answers
79 views

Data sharing across processes [closed]

I have a C# .NET app that downloads a users Tweets using LinqToTwitter. This is for TV broadcast - the client wants to show Tweets on air. We have two other apps that need to access these tweets. One ...
0
votes
1answer
86 views

Using MVC strictly with DAAB?

I am the only one at my company that is familiar with MVC and they are getting more pressure to modernize and switch to MVC for future projects, so I was tasked to create a template to use as a base ...
3
votes
1answer
95 views

Algorithm that determines relevant attributes in ordered list

Suppose I have a list of objects sorted by a person based on that person's subjective taste. Let's assume that this person is being somewhat consistent in their sorting and that there are quantifiable ...
0
votes
1answer
334 views

Design pattern for configuring objects

Context In a Cocoa application I am developing, I need to load a data model that is defined in plist files. So, I have something like: root (Array) ---- item (Dictionary) -------- name : "objects" ...
1
vote
1answer
414 views

Is it ethical or even legal to track user data/metrics using IP [closed]

This one is a bit tough. It is publicly available information, is it not? But it's can also be used maliciously. So is it legal/ethical to store and/or gather information on users based on IP? It's ...
1
vote
3answers
259 views

Starting with BI / Data Analysis [closed]

We have a bunch of data about our customers and we'd like to learn more about it. Writing queries to pull data out is not a problem, and we're doing that right now, but we'd like to take it to the ...
1
vote
4answers
445 views

Data duplication vs Encapsulating. Which design to use?

The problem that I face is how to combine encapsulating and optimal memory use. I can't show you my code and therefore explain it on extensive (I hope) example. Let's say we need to have a database ...
5
votes
1answer
169 views

Version control and data provenance in charts, slides, and marketing materials that derive from code ouput [closed]

I develop as part of a small team that mostly does research and statistics stuff. But from the output of our code, other teams often create promotional materials, slides, presentations, etc. We run ...
2
votes
1answer
2k views

AngularJS dealing with large data sets (Strategy)

I am working on developing a personal temperature logging viewer based on my rasppi curl'ing data into my web server's api. Temperatures are taken every 2 seconds and I can have several temperature ...
0
votes
2answers
75 views

Cleaning a dataset of song data - what sort of problem is this?

I have a set of data about songs. Each entry is a line of text which includes the artist name, song title, and some extra text. Some entries are only "extra text". My goal is to resolve as many ...
-2
votes
1answer
70 views

Turning a problem into a data

OK, I have an app that I'm creating but I'm just really not sure about how to approach the problem. The idea is fairly simple. I'm just not sure how to wrap it in a data model (or even if I should). ...
0
votes
2answers
227 views

Perfomance of 8 bit operations on 64 bit architechture

I am usually a Python / Database programmer, and I am considering using C for a problem. I have a set of sequences, 8 characters long with 4 possible characters. My problem involves combining sets of ...
4
votes
2answers
819 views

Deduplication of complex records / Similarity Detection

I'm working on a project that involves records with fairly large numbers of fields (~15-20) and I'm trying to figure out a good way to implement deduplication. Essentially the records are people along ...
1
vote
1answer
330 views

Consolidating hotels data from various booking sites with different IDs or reference

In one of my projects, I have data for hotels, and other booking sites are able to book this hotel. For example: Hotel A - Booking (ID = 4002), Expedia (ID = 123), Priceline (ID = 147) The three ...
0
votes
0answers
37 views

Program design with multiple data sets, algorithms and results [duplicate]

I have a question regarding the design of my software. The question has already been posted by me at ...
1
vote
3answers
371 views

Program design with multiple data sets, algorithms and results

I have a question regarding the design of my software. There are four different data sets and three consecutive algorithms operating on the data sets and on the results from the previous algorithm ...
2
votes
1answer
518 views

Storing graphs with json and db

I have a Rails 4 app having to do with graphs. These graphs need to be stored and I'm not sure of the best way to do it. Firstly, the app has a SQLite db in development and PostgreSQL in production. I ...
14
votes
2answers
8k views

Data Synchronization in mobile apps - multiple devices, multiple users

I'm looking into building my first mobile app. One of the core features of the application is that multiple devices/users will have access to the same data -- and all of them will have CRUD rights. I ...
0
votes
1answer
279 views

Version-control friendly, append-only file format: “binary” or “text”?

I'm designing an append-only ("journaled") file format, and I'd like it to be friendly towards being stored in VCS (git/Mercurial/...). On one hand, I'd like if after each change, only delta ...
4
votes
5answers
504 views

Should I encrypt files saved by my program

I'm trying to decide on what format I should save data in, and hopefully this question will help me come to a decision. The program I'm writing uses 'databases' in which word=meaning (not a ...
2
votes
2answers
250 views

Why do CSV file formats normally use quoting instead of escaping?

There are a lot of variants of the CSV "standard" (or lack thereof). I've never personally see any that use an escape character (like \) instead of surrounding each field with double quotes. Instead ...
1
vote
1answer
382 views

Best approach for near real time message passing from server to client across router?

I am developing an application which must run on up to thousands of client systems that I control (Linux) which are connected behind common NAT devices to public Internet. Each of these client ...
2
votes
3answers
423 views

Storing data in 2 different systems/database structures

My company is an online retailer, and we use an homebrew ecommerce platform. In the last year or so, we've partnered with a accounting software vendor, as our homebrew solution was unable to produce ...
1
vote
1answer
107 views

Are there any standard for exchanging rules rather than data?

Just out of curiosity. There are many open standards for data exchange, as well as standards for exchanging code (jsonp, for example). But are there any standards for exchanging formulas/rules, for ...
1
vote
2answers
1k views

Radix exchange sort implementation?

I need a little help understanding the implementation of radix exchange sort algorithm. Radix exchange (I don't know if it's the exact name in english based literature) is a lot similar to quicksort, ...
1
vote
2answers
3k views

Dataset with coordinates of borders of countries [closed]

I am creating an application that visually displays world regions, e.g. to place markers within an administrative region. Does a dataset exist with geometrical or geographical (long/lat) descriptions ...
2
votes
1answer
2k views

Why retrieves a native app data faster than one with PhoneGap?

I know that an app developed with PhoneGap is slower than a native one because at PhoneGap the whole code must be interpreted at runtime into a native one. But could someone explain or has a good ...