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• Forcing deallocation of large cache object in Java

  - by Jack

  I use a large (millions) entries hashmap to cache values needed by an algorithm, the key is a combination of two objects as a long. Since it grows continuously (because keys in the map changes, so old ones are not needed anymore) it would be nice to be able to force wiping all the data contained in it and start again during the execution, is there a way to do effectively in Java? I mean release the associated memory (about 1-1.5gb of hashmap) and restart from the empty hashmap..

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• How to create a complete binary tree of height 'h' using Python?

  - by Jack

  Here is the node structure class Node: def __init__(self, data): # initializes the data members self.left = None self.right = None self.parent = None self.data = data complete binary tree Definition: A binary tree in which every level, except possibly the deepest, is completely filled. At depth n, the height of the tree, all nodes must be as far left as possible. -- http://www.itl.nist.gov/div897/sqg/dads/HTML/completeBinaryTree.html I am looking for an efficient algorithm.

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• Best way to get individual digits from int for radix sort in C/C++

  - by jordanstephens

  What is the best way to get individual digits from an int with n number of digits for use in a radix sort algorithm? I'm wondering if there is a particularly good way to do it in C/C++, if not what is the general best solution?

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• Creating a MySQL view with an auto-incrementing id column

  - by hmemcpy

  I have a MySQL database from which a view is created. Is is possible to add an auto-incrementing id for each row in the view? I tried CREATE ALGORITHM=UNDEFINED DEFINER=`database_name`@`%` SQL SECURITY DEFINER VIEW `MyView` AS set @i = 0; select @i:=@i+1 as `id` ... but that doesn't work in a View. Sorry, my SQL is weak, any help is appreciated.

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• SOM for Detection

  - by Tim

  I would like to know how I can use SOM for disease detection. Given a lung cancer dataset, how can SOM be applied for detection, there are certain terminologies like, sensitivity, specificity and accuracy percentages....are there ways to calculate all these with the SOM algorithm? I would appreciate answers from anyone who can shed more light on this

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• Interview question

  - by rahul

  Recenty I was asked this interview question: There is a server which receives millions of requests every day. Design an API for finding out hits in the last one minute, in the last 10 minutes etc. What should be the algorithm and design to implement it efficienly. I want to know the ideas on this.

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• Java fixed memory map

  - by juber

  Hi, Is there a simple, efficient Map implementation that allows a limit on the memory to be used by the map. My use case is that I want to allocate dynamically most of the memory available at the time of its creation but I don't want OutOFMemoryError at any time in future. Basically, I want to use this map as a cache, but but I wanna avoid heavy cache implementations like EHCache. My need is simple (at most an LRU algorithm)

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• How does Microsoft generate the Event ID for winqual events?

  - by Tim

  I am curious about the IDs that are used to identify items in winqual. I assume it is some sort of hash. Is this published? Hash of the module name, its version and an offset? That seems appropriate but the size is too small to cover the possibilities unless some truncation/lossy algorithm is used. This seems to be generated with the minidump on the client machine.

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• Questions about .NET CollectionEditor type

  - by smwikipedia

  Who can tell me the internal working mechanism of a CollectionEditor in plain English? I have implemented every virtual function and step into each of them. Still got no clue of its intended algorithm. I searched the web and found tons of compaints about the CollectionEditor type, and even bugs. I am kind of thinking of the CollectionEditor as a total mess.

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• opengl es render but dont show on display

  - by Sponge

  i have written a object selection algorithm which picks the objects by there color. i give every object an unique color and then i just have to use the glReadPixels method to check which object was selected this works fine and is really fast but the problem is that the frame is displayed on the screen with all the picking-colors so the screen flashes every time you select something. so my question is: how do i write everything in the correct display buffer but dont display it on the screen to avoid these flashes?

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• Interview Q: find angle between hour and minute hands in an analog clock

  - by polygenelubricants

  I was given this interview question recently: An analog clock shows that the current time is HH:MM. Compute in degree, the smaller angle between the hour and minute hands. Be as precise as you can. I'm wondering what's the simplest, most readable, most precise algorithm is. Solution in any language is welcome (but do explain it a bit if you think it's necessary).

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• 50 sequences in one line

  - by user343934

  I have alignment file and long record in it. Suppose while displaying to an end user i want to show Sequence ID and 50 sequences in each line and continue further till the end of file. Can anyone suggest me algorithm or example code in python. Thanks in advance

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• Rectangles Covering

  - by den bardadym

  I have N rectangles with sides parallel Ox and Oy. Exists another rectangele (model). I need create algorithm, which can tell: is model covered by N rectangles? and code him. I have some ideas. First I think need sort rectangles by left side (it can be done by O(n log n)). Then I think need use vertical sweeping line. Thanks.

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• Too much data for RSA block fail. What is PKCS#7?

  - by Tom Brito

  Talking about javax.crypto.Cipher; I was trying to encrypt data using Cipher.getInstance("RSA/None/NoPadding", "BC"); but I got the exception: ArrayIndexOutOfBoundsException: too much data for RSA block Looks like is something related to the "NoPadding", so, reading about padding, looks like CBC is the best approach to use here. I found at google something about "RSA/CBC/PKCS#7", what is this "PKCS#7"? And why its not listed on sun's standard algorithm names?

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• LZMA compression settings details

  - by Shadi

  Hi everyone, I really need to know what each lzma parameter (mf, fb, lp, ...) means. I could not find any good documentation in the internet. I need details of this algorithm. the most detailed one is: http://www.bugaco.com/7zip/MANUAL/switches/method.htm I would appreciate any help. Best wishes, Shadi.

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• Is there a python wrapper for a FastLZ implementation

  - by Rhubarb

  Looking to use FastLZ in Python, or something similar. Tried Google and didn't find anything. Wondering if there is another algorithm with similar performance available in Python?

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• The difference between triangulation and mesh

  - by xiao

  I have done some computer graphical programming recently, and I have no experience before. I used the library call CGAL(computer geometry algorithm library). Also, I noticed that there is class for triangulation and also class for mesh. Is mesh just a kind of triangle net? Do they have any differences? Thanks!

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• What is the advantage of Lucene searching and indexing ?

  - by Mehdi Amrollahi

  I want to know , What is the advantage of Lucene searching and indexing ? Is searching with Lucene as fast as other searching algorithm like Quick Search? What about indexing ? I want to know more about advantage of Lucene rather that others . thanks .

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• Programming With Markov Algorithms.

  - by Bubba88

  Hello! I Wonder if someone has used Markov Algorithm-based programming system or embedded facility in production or for scientific purpose. I know about 'REFAL' programming language invented a thousand years ago, but it all seems to be dead, so.. Ref: http://en.wikipedia.org/wiki/Markov_algorithm

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• automatic test data generate using genetic algo in matlab.

  - by shalini

  hi, i m doing my project in software testing. gnetic algorithm is the technique i want to use to generate automatic test data\test cases in matlab. please help me in doing my project successfully. thanks.

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• about the usage of mudolus operator

  - by matin1234

  Hi this a part of code for Quick Sort algorithm but realy I do not know that why it uses rand() %n please help me thanks Swap(V,0,rand() %n) // move pivot elem to V[0]

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• What's the difference between sound and unsound reasoning?

  - by leon

  In terms of Artificial Intelligent and Logic Knowledge, What is the difference between sound and unsound reasoning? Also, what kind of search Does ID3 algorithm use? Is it Breadth-first search? Thanks

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• Determine the relative compliment of two IEnumerable<T> sets in .net

  - by SFun28

  Hi! Is there an easy way to get the relative compliment of two sets? Perhaps using LINQ? http://en.wikipedia.org/wiki/Complement_(set_theory) I have to find the relative compliment of a set A relative to B. Both A and B are of type HashSet but I think the algorithm could be made more generation (IEnumerable or even ISet)? I could use a solution in either vb.net or C#.

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• String Processing Algorithms..

  - by RBA

  Hi, Please share some good websites where I can learn more on String Processing Techniques and could grill myself more into different kinds of algorithm available in this field.. Thanks..

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• SHA2 Certificates in Windows 2003 CA

  - by rursw1

  Hi all, Is it possible to create a certificate template that uses SHA-2 (sha256, sha224, sha384, sha512), from a Windows server 2003 CA? I know how to do it in Windows server 2008 based CA, with the new version (version 3) - it is possible to specify the hash algorithm (Under the "Cryptography" tab of the template properties). But is it possible in 2003 based CA? Thanks.

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