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Search found 1848 results on 74 pages for 'algorithms'.

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• .NET Geometry Library

  - by dewald

  Does anyone know of a good (efficient, nice API, etc.) geometry open source library for .NET? Some of the operations needed: Data Structures Vectors (2D and 3D with floats and doubles) Lines (2D and 3D) Rectangles / Squares / Cubes / Boxes Spheres / Circles N-Sided Polygon Matrices (floats and doubles) Algorithms Intersection calculations Area / Volume calculations

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• shape fitting - gis

  - by csetzkorn

  Hi, Let us say I have two shapes. One is a polygon and the other a square. Each shape consists of lines which two points (a latitude/logitude pair). I would like to determine the degree to which the square is within the polygon (percentages 0 ... 100). Is this possible? Any pointers to relevant algorithms would be very much appreciated. Thanks. Christian

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• How do I arbitrarily distort a textured polygon?

  - by Archagon

  I'd like to write a program that lets me arbitrarily distort a textured polygon by dragging its vertices. I want the texture to distort fluidly and without overlap, assuming the new polygon doesn't intersect itself. I should also be able to repeat the process with the new shape, and with a minimum amount of loss. Are there any algorithms for doing this?

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• String searching algorithm for Chinese characters.

  - by Jack Low

  There are Python code available for existing algorithms for normal string searching e.g. Boyer-Moore Algorithm. I am looking to use this on Chinese characters and it doesn't seem like the same implementation would work. What would I go about doing in order to make the algorithm work on Chinese characters? I am referring to this: http://en.literateprograms.org/Boyer-Moore_string_search_algorithm_(Python)#References

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• Windows - put HDD stand-by and sleep mode

  - by iulianchira

  How can I put a hard disk drive in stand-by or sleep mode in Windows, in a programmatic manner. Does the Windows API or any .Net libraries provide any functions to achieve this? (I am aware that I should probably not interfere with Windows's power management mechanism, but this is not something I intend to use in a production environment, it is a proof of concept for some algorithms).

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• 3d symmetry search algorithm

  - by aaa

  this may be more appropriate for math overflow, but nevertheless: Given 3d structure (for example molecule), what is a good approach/algorithm to find symmetry (rotational/reflection/inversion/etc.)? I came up with brute force naive algorithm, but it seems there should be better approach. I am not so much interested in genetic algorithms as I would like best symmetry rather then almost the best symmetry link to website/paper would be great. thanks

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• Handling User Authentication in .NET?

  - by Daniel

  I am new to .NET, and don't have much experience in programming. What is the standard way of handling user authentication in .NET in the following situation? In Process A, User inputs ID/Password Process A sends the ID/Password to Process B over a nonsecure public channel. Process B authenticates the user with the recieved ID/Password what are some of the standard cryptographic algorithms I can use in above model?

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• Existing implementation of Btree or B+tree in Java

  - by rohit

  I am doing a project in which I require btree or b+tree data structure. Does anyone know of an existing implementation of btree or b+tree (with insert, delete, search algorithms)? It should accept string as input and form btree or b+tree of these string.

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• What kind of data processing problems would CUDA help with?

  - by Chris McCauley

  Hi, I've worked on many data matching problems and very often they boil down to quickly and in parallel running many implementations of CPU intensive algorithms such as Hamming / Edit distance. Is this the kind of thing that CUDA would be useful for? What kinds of data processing problems have you solved with it? Is there really an uplift over the standard quad-core intel desktop? Chris

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• Calculate the Hilbert value of a point for use in a Hilbert R-Tree?

  - by wrt

  I have an application where a Hilbert R-Tree (wikipedia) (citeseer) would seem to be an appropriate data structure. Specifically, it requires reasonably fast spatial queries over a data set that will experience a lot of updates. However, as far as I can see, none of the descriptions of the algorithms for this data structure even mention how to actually calculate the requisite Hilbert Value; which is the distance along a Hilbert Curve to the point. So any suggestions for how to go about calculating this?

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• Quantum Computing and Encryption Breaking

  - by Earlz

  Ok, I read a while back that Quantum Computers can break most types of hashing and encryption in use today in a very short amount of time(I believe it was mere minutes). How is it possible? I've tried reading articles about it but I get lost at the a quantum bit can be 1, 0, or something else. Can someone explain how this relates to cracking such algorithms in plain English without all the fancy maths?

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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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• Why is it useful to count the number of bits?

  - by Scorchin

  I've seen the numerous questions about counting the number of set bits in a insert type of input, but why is it useful? For those looking for algorithms about bit counting, look here: http://stackoverflow.com/questions/1517848/counting-common-bits-in-a-sequence-of-unsigned-longs http://stackoverflow.com/questions/472325/fastest-way-to-count-number-of-bit-transitions-in-an-unsigned-int http://stackoverflow.com/questions/109023/best-algorithm-to-count-the-number-of-set-bits-in-a-32-bit-integer

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• Controlled execution of computationally expensive tasks

  - by Sergio

  Say you have an application where a user is typing some text and as she types you'd want to perform some expensive computations in the background (related to the text that is being typed). Although you would like to do lots of things, your main priority is that the system responsiveness stay at acceptable levels so the user doesn't notice such a heavy load. Is there a way (ideally platform/language independent) to control what algorithms should be executed in the background based on the system load and responsiveness?

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• reflection paths between points in2d

  - by Chris H

  Just wondering if there was a nice (already implemented/documented) algorithm to do the following Given any shape (without crossing edges) and two points inside that shape, compute all the paths between the two points such that all reflections are perfect reflections. The path lengths should be limited to a certain length otherwise there are infinite solutions. I'm not interested in just shooting out rays to try to guess how close I can get, I'm interested in algorithms that can do it perfectly. Search based, not guess/improvement based.

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• Finding patterns in source code

  - by trex279

  If I wanted to learn about pattern recognition in general what would be a good place to start (recommend a book)? Also, does anybody have any experience/knowledge on how to go about applying these algorithms to find abstraction patterns in programs? (repeated code, chunks of code that do the same thing, but in slightly different ways, etc.) Thanks Edit: I don't mind mathematically intensive books. In fact, that would be a good thing.

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• Cpu schedule, removing thread from queue

  - by Kamil

  I'm implementing now CPU schedule algorithms FCFS, SJF and Round Robin. Could somebody tell when process is removed from queue (FCFS,SJF,RR)? I mean, first CPU execute thread and after executing remove from queue or the other way around?

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• Algorithm for data alignment of float arrays in Java

  - by Derk

  I have two float arrays representing y values in a line chart. Now I want to align these two charts. Are there any existing algorithms for alignment of the two arrays? A very simple example a: 2.5 1.3 1.6 4.2 3.6 b: 3.3 1.4 2.5 1.3 1.6 Now after alignment it should be: 2.5 1.3 1.6 4.2 3.6 3.3 1.4 2.5 1.3 1.6

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• graph library for scala

  - by Elazar Leibovich

  Is there a good library (or wrapper to Java library) for graphs, and/or graph algorithms in scala? This one seems to be quite dead. This is an example for the Dijkstra algorithm in scala, but I'm looking for a library a-la JGraphT.

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• Simple C image library?

  - by Timmy

  What's the simplest C image library for loading and saving? I just want a 2D array to test some algorithms, and built-in functions are not needed.

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• Latex: Listing all figures (tables, algorithm) once again at the end of the document

  - by Zlatko

  Hi all, I have been writhing a rather large document with latex. Now I would like to list all the figures / tables / algortihms once again at the end of the file so that I can check if they all look the same. For example, if every algorithm has the same notation. How can I do this? I know about \listofalgorithms and \listoffigures but they only list the names of the algorithms or figures and the pages where they are. Thanks.

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• Colloborative filtering

  - by Pranay Kumar

  How can i use SVD algorithm in mahout for producing recommendations on explicit binary data-set (eg. a user purchased or not but no specific ratings ) in an e-commerce domain ? Also what algorithms aim at producing recommendations on such binary data-sets ? Thanks in advance. Pranay Kumar, 2nd yr,cse

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• How to fit a custom graph to the boost graph library template?

  - by Michael

  I'm rusty on C++ templates and I'm using the boost graph library (a fatal combination). I've searched the web and can't find any direct instructions on how to take a custom graph structure and fit enough of it to BGL (boost graph library) that I can use boosts graph traversing algorithms. Anyone familiar enough with the library to help me out?

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• Most valuable course in the CS degree.

  - by danielrutledge

  I was a math major and I took OOP and Algorithms & Data Structures from the CS department while in school, but didn't continue to any upper-division courses. What were the most valuable courses to your programming career (Operating systems, Compiler Design, Computer architecture, etc) in your CS degree? Alternatively, if you're like me and don't have one, are there any courses you wish you had taken? What would be the best way to fill in the gaps in my knowledge outside of school?

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• What algorithm .Net use for searching a pattern in a string?

  - by Hun1Ahpu

  I'm studying string searching algorithms now and wondering what algorithm is used for .NET String.Contains function for example. Reflector shows that this function is used but I have no idea what its name means. private static extern int InternalFindNLSStringEx(IntPtr handle, string localeName, int flags, string source, int sourceCount, int startIndex, string target, int targetCount);

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