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• Dynamic programming practice problems with solutions

  - by Algorist

  Hi, I have seen many questions on stackoverflow where dynamic programming technique can be used to make a exponential algorithm, a polynomial one. I have seen standard problems on dynamic programming. Is there a website or book that contains practice problems and solutions? Thanks Bala

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• Image rotation algorithm

  - by Stefano Driussi

  I'm looking for an algorithm that rotates an image by some degrees (input). public Image rotateImage(Image image, int degrees) (Image instances could be replaced with int[] containing each pixel RGB values, My problem is that i need to implement it for a JavaME MIDP 2.0 project so i must use code runnable on JVM prior to version 1.5 Can anyone help me out with this ? EDIT: I forgot to mention that i don't have SVG APIs available and that i need a method to rotate by arbitrary degree other than 90 - 180- 270 Also, no java.awt.* packages are available on MIDP 2.0

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• Algorithm for heat map?

  - by eshan

  I have a list of values each with latitude and longitude. I'm looking to create a translucent heatmap image to overlay on Google Maps. I know there are server side and flash based solutions already, but I want to build this in javascript using the canvas tag. However, I can't seem to find a concise description of the algorithm used to turn coordinates and values into a heatmap. Can anyone provide or link to one? Thanks.

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• Simplest Algorithm for 2D Interpolation

  - by Gayan

  I have two shapes which are cross sections of a channel. I want to calculate the cross section of an intermediate point between the two defined points. What's the simplest algorithm to use in this situation? P.S. I came across several algorithms like natural neighbor and poisson which seemed complex. I'm looking for a simple solution which could be implemented quickly

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• C# Algorithm to Tint a Color a Certain Percent

  - by Josh Close

  I have a color and I want get a tint of that color by a certain percent. So 100% is the color itself, 90% is a slightly lighter color, etc. Basically, it's like adding 10% of opacity to the color, if the color is on a white background. I need to convert the color into a hex HTML color value, so I don't want transparency. Is there an algorithm to get a tint of the System.Drawing.Color RGB value?

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• Pseudo LRU tree algorithm.

  - by patros

  A lot of descriptions of Pseudo LRU algorithms involve using a binary search tree, and setting flags to "point away" from the node you're searching for every time you access the tree. This leads to a reasonable approximation of LRU. However, it seems from the descriptions that all of the nodes deemed LRU would be leaf nodes. Is there a pseudo-LRU algorithm that deals with a static tree that will still perform reasonably well, while determining that non-leaf nodes are suitable LRU candidates?

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• Moon / Lunar Phase Algorithm

  - by Scott Bailey

  Does anyone know an algorithm to either calculate the moon phase or age on a given date or find the dates for new/full moons in a given year? Googling tells me the answer is in some Astronomy book, but I don't really want to buy a whole book when I only need a single page.

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• Neural Net Optimize w/ Genetic Algorithm

  - by ServAce85

  Is a genetic algorithm the most efficient way to optimize the number of hidden nodes and the amount of training done on an artificial neural network? I am coding neural networks using the NNToolbox in Matlab. I am open to any other suggestions of optimization techniques, but I'm most familiar with GA's.

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• Dijstra shortest path algorithm with edge cost.

  - by Svisstack

  Hello, I have a directed, positive weighted graph. Each edge have a cost of use. I have only A money, i want to calculate shortest paths with dijkstra algorithm, but sum of edges costs on route must be less or equal to A. I want to do this with most smallest Dijstra modification (if I can do it with small modification of Dijkstra). Anyone can help me with this?

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• Algorithm for 2D Interpolation

  - by Gayan

  I have two shapes which are cross sections of a channel. I want to calculate the cross section of an intermediate point between the two defined points. What's the simplest algorithm to use in this situation? P.S. I came across several algorithms like natural neighbor and poisson which seemed complex. I'm looking for a simple solution which could be implemented quickly EDIT: I removed the word "Simplest" from the title since it might be misleading

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• What are The opencv function useful for 2d skeleton estimation(ofRecursive centroids) [closed]

  - by kumar

  Possible Duplicate: Which is the best algorithm to “Estimate and Visulize 2d skeleton using Opencv” from the drawn contour Opencv functions or stepts for 2d skeleton estimation

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• Algorithm Analysis tool for java

  - by Mansoor

  I am looking for an algorithm analysis tool for java that can calculate Big 0 of a function. Ideal I would like to make it part of my build process, along side of my other code metrics tool. Even after searching on google I am unable to find any opensource of commercial tool. Any suggestion would be welcome Thanks

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• Word Anagram Hashing Algorithm?

  - by Ahmed Said

  Given set of words, we need to find the anagram words and display each category alone using the best algorithm input: man car kile arc none like output: man car arc kile like none the best solution I am developing now is based on a hashtable, but I am thinking about equation to convert anagram word into integer value exmaple: man = 'm'+'a'+'n' but this will not give unique values any suggestions?

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• Bezier Algoritms - an algorithm for inserting points

  - by Sorush Rabiee

  I'm looking for an algorithm to insert a new control point on a bezier curve, without deforming: did anybody knows a library or reference for bezier algorithms (insertion, optimize, de Casteljau ...)

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• Graph spacing algorithm

  - by David

  Hi, I am looking for an algorithm that would be useful for determining x y coordinates for a number objects to display on screen. Each object can be related to another object and there can be any number of relationships and there can be any number of these objects. There is no restriction on the overall size of area on which to display these object. I am writing this in php and would be looking to store the coordinates in an array.

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• aother option for modified preorder tree traversal algorithm

  - by poldo

  Hi, been searching for a while now and can't seem to find an alternative solution. I need the tree traversal algorithm in such a way that a node can have more than 1 parent, if it's possilbe (found a great article here: Storing Hierarchical Data in a Database). Are there any algorithms so that, starting from a root node, we can determine the sequence and dependencies of nodes (currently reading topological sorting)? thanks in advance!

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• Psuedo LRU tree algorithm.

  - by patros

  A lot of descriptions of Pseudo LRU algorithms involve using a binary search tree, and setting flags to "point away" from the node you're searching for every time you access the tree. This leads to a reasonable approximation of LRU. However, it seems from the descriptions that all of the nodes deemed LRU would be leaf nodes. Is there a pseudo-LRU algorithm that deals with a static tree that will still perform reasonably well, while determining that non-leaf nodes are suitable LRU candidates?

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• What Sorting Algorithm Is Used By LINQ "OrderBy"?

  - by Mystagogue

  Evidently LINQ's "OrderBy" had originally been specified as unstable, but by the time of Orca it was specified as stable. Not all documentation has been updated accordingly - consider these links: Jon Skeet on OrderBy stability Troy Magennis on OrderBy stability But if LINQ's OrderBy is now "stable," then it means it is not using a quicksort (which is inherently unstable) even though some documentation (e.g. Troy's book) says it is. So my question is: if not quicksort, then what is the actual algorithm LINQ's orderBy is using?

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• dijkstra/prim's algorithm...a little help?

  - by bfpri

  I was wondering for dijkstra's and prim's algorithm, what happens when they are choosing between more than one vertex to go to ,and there are more than one vertex with the same weight. For example

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• Algorithm putting point into square with maximal minimum distance

  - by Mikulas Dite

  I'm stuck on this: Have a square. Put n points into this square so the minimal distance (not necessary the average distance) is the highest possible. I'm looking for an algorithm which would be able to generate the coordinates of all points given the count of them. Example results for n=4;5;6: Please don't mention computing-power based stuff such as trying a lot of combination and then nitpicking the right one and similar ideas.

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• Roulette wheel selection algorithm

  - by swati

  Can anyone provide some pseudo code for a roulette selection function? How would I implement this: I don't really understand how to read this math notation.I want General algorithm to this.

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• Draw arrow on line algorithm

  - by nunos

  Does anyone have an algorithm for drawing an arrow in the middle of a given line. I have searched for google but haven't found any good implementation. P.S. I really don't mind the language, but it would be great if it was Java, since it is the language I am using for this. Thanks in advance.

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• What is an algorithm for joining PCM files?

  - by Ole Jak

  What is an algorithm for joining PCM files? I have several PCM files I need to Join them in a way like speakers are speac at the same time. So How to Join PCM files?

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• Java Algorithm HmacSHA256 not available

  - by user324929

  Hi, I am trying an encryption-decryption code in java. When I am trying to run it with JDK and code in class with main method it is running fine. But when I am trying to run same code in Tomcat, tomcat is throwing exception: java.security.NoSuchAlgorithmException: Algorithm HmacSHA256 not available. Can anybody guide me to proper direction please? Thank you.

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• Google search results : How to find the minimum window that contains all the search keywords?

  - by Algorist

  Hi, I was wondering what will the complexity of the algorithm that is used to find the smallest snippet that contains all the search key words. Please explain the complexity, if non-trivial. Thanks Bala

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