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• Big O, how do you calculate/approximate it?

  - by Sven

  Most people with a degree in CS will certainly know what Big O stands for. It helps us to measure how (in)efficient an algorithm really is and if you know in what category the problem you are trying to solve lays in you can figure out if it is still possible to squeeze out that little extra performance.* But I'm curious, how do you calculate or approximate the complexity of your algorithms? *: but as they say, don't overdo it, premature optimization is the root of all evil, and optimization without a justified cause should deserve that name as well.

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• sin v/s sinf fucntion in C

  - by user319873

  Hi Guys, I am trying to use sinf function in my C Program and it does give me undefined reference under MSVC 6.0 but sin works fine. This make me curious to find the difference between sin and sinf. What is the logical difference between sin and sinf(). How can I implement my own sinf functionality?

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• Text -> Diagram Tool

  - by Jon

  I'm looking for an diagram tool for producing diagrams from text. I only really need sequence and state type diagrams for now, but I'm curious as to what people would recommend? I need something which is standalone, not a web based tool that works on Linux, OSX and Windows.

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• How does IP geolocating work?

  - by weicool

  I'm not looking for a service that does this. I'm just curious as to how geolocation works.

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• Getting Data For Webpages?

  - by fuzzygoat

  When looking to get data from a web page whats the recommended method if the page does not provide a structured data feed? Am I right in thinking that its just a case of doing an NSURLRequest and then hacking what you need out of the responseData(NSData*)? I am not too concerned about the implementation in Xcode, I am more curious about actually collecting the data, before I start coding a "hunt & peck" through a list of data. gary

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• Curiosity beyond abstractions: how is bytecode executed? how do device drivers work?

  - by Yktula

  Everything I've seen on *nix has been a set of abstractions off hardware, but I'm curious as to how the hardware works. I've programmed in assembly, but that's still only a set of abstractions. How does a processor understand assembly opcodes (as bytecode)? How do device drivers work (with an explanation at a lower level (of abstraction))?

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• other way to add item to List<>

  - by netmajor

  In my other question You can see code of my arr structure and PriorityQueue collection. I normally add items to this collection like that: arr.PriorityQueue.Add(new element((value(item, endPoint) + value(startPoint, item)),item)); I am curious that is other way to do this (add element(which is struct) object to List) ? In lambda way for example ? I just eager for knowledge :)

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• nhibernate virtual methods & resharper

  - by Berryl

  I am curious how other Resharper users deal wih R#'s complaint about virtual methods it thinks are unused because it can't tell that NHIb will use them at runtime. I currently leave it as a hint, reluctantly, although am tempted to shut it off completely. Cheers, Berryl

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• Jquery SimpleModal: what is the purpose of the container?

  - by mikez302

  I am trying to use the jQuery SimpleModal plugin and I am curious about something: The description page mentions a "container" div. What is the purpose of this? Do I need to use it to use the plugin?

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• Curiosity beyond abstractions: how do device drivers work?

  - by Yktula

  Everything I've seen on *nix has been a set of abstractions off hardware, but I'm curious as to how the hardware works. I've programmed in assembly, but that's still only a set of abstractions. How do device drivers work (at a lower level)? How does a processor understand assembly opcodes (as bytecode)?

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• c# string formatting

  - by user177883

  I m curious why would i use string formatting while i can use concatenation such as Console.WriteLine("Hello {0} !", name); Console.WriteLine("Hello "+ name + " !"); Why to prefer the first one over second?

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• recommendation systems and the cold start problem

  - by Hellnar

  Hello, I am curious what are the methods / approaches to overcome the "cold start" problem where when a new user or an item enters the system, due to lack of info about this new entity, making recommendation is a problem. I can think of doing some prediction based recommendation (like gender, nationality and so on). Thanks

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• Get width of a single character from ttf-font in php?

  - by Martti Laine

  Hello I'm creating an dynamic image, which creates headers on my page using PHPs GD-library. The problem is, that I need a line-wrapping system. It's not a problem itself, but first I need to get the width (in pixels) of current character. I'm pretty curious about this, is there any way? Or do I need to manually specify width of every abc? Martti Laine

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• WPF Binding with RelativeSource of Window Requires "DataContext" in Path?

  - by Phil Sandler

  The following code works, but I'm curious as to why I need the Path to be prefixed with "DataContext"? In most other cases, the path used is relative to DataContext. Is it because I am using a RelativeSource? Because the source is at the root level (Window)? <Style TargetType="TextBox"> <Setter Property="IsReadOnly" Value="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}, Path=DataContext.IsReadOnly}"/> </Style>

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• JavaScript Collection of one-line Useful Functions

  - by Wilq32

  This is a question to put as many interesting and useful JavaScript functions written in one line as we can. I made this question because I'm curious how many people around like the art of one-Line programming in JavaScript, and I want to see their progress in action. Put variations of each code inside comments.

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• How to sanity check a date in java

  - by Bloodboiler

  I find it curious that the most obvious way to create Date objects in Java has been deprecated and appears to have been "substituted" with not so obvious to use lenient calendar. So... How do you check that a date given as a combination of day, month and year is a valid date? For instance a date 2008-02-31 (as in yyyy-mm-dd) would be invalid date.

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• Can someone tell me what this means WriteLine("{0,-12}")

  - by Matt

  {0,-12} is the part i'm curious about.. I'm looking at this example Console.WriteLine("{0,-12} {1}", sqlReader.GetName(0), sqlReader.GetName(1)); Cheers :)

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• Real time soft shadows without stencil buffers

  - by Tomh

  I'm really curious how the following is done They seem to achieve real time softish shadows on the iphone which does not have a stencil buffer available. It seems to run pretty fluid here http://www.youtube.com/watch?v=u5OM6tPoxLU Anyone has an idea?

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• Google C++ style guide

  - by user231536

  I am curious as to what people think of the google C++ style guide. http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml I see references to it scattered across stackoverflow and would like to collect your opinions as to what you think about it.

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• Windows API Programming

  - by Chris

  I found this site, http://www.apitalk.com/document.php?id=1184207999_1 and I'm not sure if this site is using ATL, STL, MFC, or just calling API functions directly. I have done console programming with C++ and graphics programmign with C++ in Borland, but I've have never done Win32 C++ programming and I'm curious if anyone knows of a good site to start with? Does anyone know of any good sites to recommend about getting up and going fast with Win32 API C++?

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• image protection in rails

  - by Cezar

  Hello, I am looking for ways to protect my product images and I don't know if there's anything out there better than what I've already found: disable right click, use a transparent image in front of your picture and watermarking. Obviously none of them is perfect but I was curious if someone came up with a better solution to this problem. Also is there any rails plugin to aid with that ? Thanks

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• Updating protected using update_all

  - by Jack

  Since you cannot use the normal 'update' and 'update_attribute' methods from ActiveRecord to update a protected attribute, is the following the best way to update an attribute for a single user? User.update_all("admin = true","id = 1") I'm guessing this doesn't lie in the 'best practice' category, so I'm just curious if there is a more appropriate way.

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• Running out of memory while analyzing a Java Heap Dump

  - by Abel Morelos

  Hi, I have a curious problem, I need to analyze a Java heap dump (from an IBM JRE) which has 1.5GB in size, the problem is that while analyzing the dump (I've tried HeapAnalyzer and the IBM Memory Analyzer 0.5) the tools runs out of memory I can't really analyze the dump. I have 3GB of RAM in my machine, but seems like it's not enough to analyze the 1.5 GB dump, My question is, do you know a specific tool for heap dump analysis (supporting IBM JRE dumps) that I could run with the amount of memory I have? Thanks.

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• Is Minus Zero some sort of JavaScript performance trick?

  - by James Wiseman

  Looking in the jQuery core I found the folloiwng code convention: nth: function(elem, i, match){ return match[3] - 0 === i; }, And I was really curious about the snippet match[3] - 0 Hunting around for '-0' on google isn't too productive, and a search for 'minus zero' brings back a reference to a Bob Dylan song. So, can anyone tell me. Is this some sort of performance trick, or is there a reason for doing this rather than a parseInt or parseFloat? Thanks

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• C++ portable end of line

  - by Andrew

  Hi everyone, is there any way to automatically use correct EOL character depending on the OS used? I was thinking of something like std::eol? I know that it is very easy to use preprocessor directives but curious if that is already available.

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