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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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• Converting to Base 10

  - by incrediman

  Hi, Let's say I have a string or array which represents a number in base N, N1, where N is a power of 2. Assume the number being represented is larger than the system can handle as an actual number (an int or a double etc). How can I convert that to a decimal string? I'm open to a solution for any base N which satisfies the above criteria (binary, hex, ...).

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• Sending part of byte array over the network using WCF

  - by nikola

  I have a byte array of some binary data that i need to send over the network using WCF and NetTcpBinding. My problem is that i need to send only the part of the array. Is there any way to do this, other than copying that part to a separate array, and sending that one. This extra copying degrades performance, and i would like to avoid it, if possible.

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• pdf read pages to BitmapData in AS3

  - by Hadi

  I’m starting a project in flash AS3 and my objective is to load any pdf file into my flash project and convert all its pages to BitmapData... I am familiar with byteArray and I know I must access the pdf in binary level but I don’t know where to start and how to start. I was hoping if you could give me some insight? Maybe a suggestion to an already library that is doing a similar work? Any idea os appreciated just to get me started...

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• Evaluating mathematical expressions in Python

  - by vander

  Hi, I want to tokenize a given mathematical expression into a binary tree like this: ((3 + 4 - 1) * 5 + 6 * -7) / 2 '/' / \ + 2 / \ * * / \ / \ - 5 6 -7 / \ + 1 / \ 3 4 Is there any pure Python way to do this? Like passing as a string to Python and then get back as a tree like mentioned above. Thanks.

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• Building elf within Eclipse

  - by BSchlinker

  Hey guys, I'm having trouble building an Elf file within Eclipse. It seems that everytime I build, a PE / portable executable for windows is created. I've gone into the Binary Parser section and checked Elf Parser while making sure that everything else is unchecked. However, I continue to end up with a PE which I cannot run on Linux. Any ideas? Thanks

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• Write Java objects to file

  - by Mark Szymanski

  Is it possible to write objects in Java to a binary file? The objects I want to write would be 2 arrays of String objects. The reason I want to do this is to save persistent data. If there is some easier way to do this let me know. Thanks in advance!

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• Monodevelop - Ubuntu - exe file as output?

  - by Sandeep Bansal

  Hi everyone, OK I'm creating an app in MonoDevelop for Ubuntu Linux, but the compiled file is always a windows exe, I've set it to compile as a Linux Binary but I'm confused, can anyone shed any light on how to get a proper Linux way of opening the program? Thanks

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• Java equivalent of C++ std::map?

  - by Rudiger

  I'm looking for a Java class with the characteristics of C++ std::map's usual implementation (as I understand it, a self-balancing binary search tree): O(log n) performance for insertion/removal/search Each element is composed of a unique key and a mapped value Keys follow a strict weak ordering I'm looking for implementations with open source or design documents; I'll probably end up rolling my own support for primitive keys/values. This question's style is similar to: Java equivalent of std::deque, whose answer was "ArrayDeque from Primitive Collections for Java".

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• Finding the largest subtree in a BST

  - by rakeshr

  Given a binary tree, I want to find out the largest subtree which is a BST in it. Naive approach: I have a naive approach in mind where I visit every node of the tree and pass this node to a isBST function. I will also keep track of the number of nodes in a sub-tree if it is a BST. Is there a better approach than this ?

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• Skip Lists -- ever used them?

  - by Head Geek

  I'm wondering whether anyone here has ever used a skip list. It looks to have roughly the same advantages as a balanced binary tree, but is simpler to implement. If you have, did you write your own, or use a pre-written library (and if so, what was its name)?

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• How to create a c/c++ tree script?

  - by Renato

  How to create a script to : compare two trees, in c/c++ in a non recursive mode? also, How to create a script in c/c++ to verify if a tree is binary, in a non recursive mode? thanks in advance.

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• What is the algorithm of Skeleton

  - by AZIRAR

  Hey, This function bwmorph(Img,'skel',Inf) return the skeleton of a binary image. What I'm looking for is the algorithm used by this function to do it manualy ?

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• What is the point of padding?

  - by ktm5124

  In particular, I'm reading into the Mach-O binary file format for Intel 32 on OS X. After the FAT header there is a whole bunch of padding before the offset of the first archive. What is the point of all this padding? To be more specific, there is upwards of 4000 bytes of padding between the FAT header and the first archive (in particular, the mach_header). Why include all these extra bytes?! Is OS X fond of adding 4 MB to all their universal binaries?

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• Real world examples of tree structures

  - by Arec Barrwin

  I'm looking for some examples of tree structures that are used in commercial/free software projects, modern or old. I can see examples on wikipedia, but I am looking for more concrete examples and how they're used. For example primary keys in databases are (from what I've read) stored in BST structure or a variation of the BST (feel free to correct me on this) My question isn't limited Binary Search Trees (BSTs), it can include any variation such as red-black, AVL and so on.

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• how to print trees onto console?

  - by Bunny Rabbit

  it would be nice if i could print the binary search trees i am writing onto python console ? any idea how to do it?

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• SOA Suite Integration: Part 3: Loading files

  - by Anthony Shorten

  One of the most common scenarios in SOA Integration is the loading of a file into the product from an external source. In Oracle SOA Suite there is a File Adapter that can process many file types into your BPEL process. For this example I will use the File Adapter to load a file of user and emails to update the user object within the Oracle Utilities Application Framework. Remember you can repeat this process with other objects and other file types. Again I am illustrating the ease of integration. The first thing is to create an empty BPEL process that will hold our flow. In Oracle JDeveloper this can be achieved by specifying the Define Service Later template (as other templates have predefined inputs and outputs and in this case we want to specify those). So I will create simpleFileLoad process to house our process. You will start with an empty canvas so you need to first specify the load part of the process using the File Adapter. Select the File Adapter from the Component Palette under BPEL Services and drag and drop it to the left side Partner Links (left is input). You name the Service. In this case I chose LoadFile. Press Next. We will define the interface as part of the wizard so select Define from operation and schema (specified later). Press Next. We are going to choose Read File to denote that we will read the file and specify the default Operation Name as Read. Press Next. The next step is to tell the Adapter the location of the files, how to process them and what to do with them after they have been processed. I am using hardcoded locations in this example but you can have logical locations as well. Press Next. I am now going to tell the adapter how to recognize the files I want to load. In my case I am using CSV files and more importantly I am tell the adapter to run the process for each record in the file it encounters. Press Next. Now, I tell the adapter how often I want to poll for the files. I have taken the defaults. Press Next. At this stage I have no explanation of the format of the input. So I am going to invoke the Native Format Wizard which will guide me through the process of creating the file input format. Clicking the purple cog icon will start the wizard. After an introduction screen (not shown), you specify the format of the input file. The File Adapter supports multiple format types. For this example, I will use Delimited as I am going to load a CSV file. Press Next. The best way for the wizard to work is with a sample. I have a sample file and the wizard will ask how much of the file to use as a template. I will use the defaults. Note: If you are using a language that has other languages other than US-ASCII, it is at this point you specify the character set to use.  Press Next. The sample contains multiple instances of a single record type. The wizard supports complex types as well. We will use the appropriate setting for our file. Press Next. You have to specify the file element and the record element. This will be used by the input wizard to translate the CSV data into an XML structure (this will make sense later). I am using LoadUsers as my file delimiter (root element) and User Record as my record root element. Press Next. As the file is CSV the delimiter is "," so I will also specify that the End Of Line (EOL) indicator indicates the end of a record. Press Next. Up until this point your have not given the columns their names. In my case my sample includes the column names in the first record. This is not always the case but you can specify the names and formats of columns in this dialog (not shown). Press Next. The wizard now generates the schema for the input file. You can specify a name for the schema. I have used userupdate.xsd. We want to verify the schema so press Test. You can test the schema by specifying an input sample. and pressing the green play button. You will see the delimiters you specified earlier for the file and the records. Press Ok to continue. A confirmation screen will be displayed showing you the location of the schema in your project. Press Finish to return to the File Adapter configuration. You will now see the schema and elements prepopulated from the wizard. Press Next. The File Adapter configuration is now complete. Press Finish. Now you need to receive the input from the LoadFile component so we need to place a Receive node in the BPEL process by drag and dropping the Receive component from the Component Palette under BPEL Constructs onto the BPEL process. We link the receive process with the LoadFile component by dragging the left most connect node of the Receive node to the LoadFile component. Once the link is established you need to name the Receive node appropriately and as in the post of the last part of this series you need to generate input variables for the BPEL process to hold the input records in. You need to now add the product Web Service. The process is the same as described in the post of the last part of this series. You drop the Web Service BPEL Service onto the right side of the process and fill in the details of the WSDL URL . You also have to add an Invoke node to call the service and generate the input and outputs variables for the call in the Invoke node. Now, to get the inputs from File to the service. You have to use a Transform (you can use an Assign action but a Transform action is more flexible). You drag and drop the Transform component from the Component Palette under Oracle Extensions and place it between the Receive and Invoke nodes. We name the Transform Node, Mapper File and associate the source of the mapping the schema from the Receive node and the output will be the input variable from the Invoke node. We now build the transform. We first map the user and email attributes by drag and drop the elements from the left to the right. The reason we needed to use the transform is that we will be telling the AS-User service that we want to issue an update action. Remember when we registered the service we actually used Read as the default. If we do not otherwise inform the service to use the Update action it will use the Read action instead (which is not desired). To specify the update action you need to click on the transactionType node on the right and select Set Text to set the action. You need to specify the transactionType of UPD (for update). The mapping is now complete. The final BPEL process is ready for deployment. You then deploy the BPEL process to the server and to test the service by simply dropping a file, in the same pattern/name as you specified, in the directory you specified in the File Adapter. You will see each record as a separate instance entry in the Fusion Middleware Control console. You can now load files into the product. You can repeat this process for each type of file to process. While this was a simple example it illustrates the method of loading data can be achieved using SOA Suite in conjunction with our products.

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• SQL Server Log File Size Management

  - by Rob

  I have all my databases in full recovery and have the log backups happening every 15 minutes so my log files are usually pretty small. question is if there is a nightly operation that causes lots of transactions to happen and causes my log files to grow, should i shrink them back down afterward? Does having a gigantic log file negatively affect the database performance? Disk space isn't an issue at this time.

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• Can I choose a sparse file as vdev for a zfs pool?

  - by Karl Richter

  man zpool states that a vdev for a zfs pool can be a "regular file". Can I specify a sparse file (the warning about the integrity of the file being determined by the underlying filesystem should apply with the same relevance for a sparse file)? The ZFS administration guide on https://pthree.org/2012/12/04/zfs-administration-part-i-vdevs/ states that file vdevs "must be preallocated, and not sparse files or thin provisioned" (thanks to @jlliagre). On https://wiki.archlinux.org/index.php/Experimenting_with_ZFS sparse files are used without any comment.

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• Remove Properties and Personal Information - Batch mode or app

  - by javamonkey79

  I am trying to remove all the properties\personal information from a set of media files in a bunch of different folders. So far the only way I have found is by clicking into each folder, selecting all files and doing the process manually like this. Does anyone know of any free apps, or scripts that can do this across multiple file locations?

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• IIS 7.5 log to: sql server vs file

  - by stacker

  I want to know if get IIS to log directly to the sql server is resource costive, and a better solution maybe generate log files, and each hour import this files to sql server. Does it VERY big cost to log to sql server each request directly? The pages are open connection to the database anyway for each request.

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• Monitor File Changes On Windows System

  - by user10487

  I am looking for a utility that can take a snapshot of the files in directories that I am interested in and then compare that snapshot to the current state of the system and show me any files that have been added, changed, or deleted. Does anyone know of solutions that provide this functionality? Thanks, Nate

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• How to use locate in cygwin

  - by Phenom

  I'm trying to use locate to find files, but I'm not getting anything back from the program. It can't even find files that are in the current directory. How do I make locate work?

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• How to prevent a file from accessing the internet

  - by Mehper C. Palavuzlar

  There are some exe and dll files belonging to some programs on my laptop which communicate with the internet without my permission (for self-update generally). I want to prevent those files one by one from accessing the internet. I don't want to install any external firewalls. I'm using Windows 7 Home Pro and if this can be done by Windows Firewall, it's OK. I took a look at Windows Firewall but couldn't find a setting to disable file access.

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• How to stop Excel 2003 from loading a Gazillion files

  - by Gary M. Mugford

  One of my soon-to-be-ex-friends got an Excel file from another friend of his and decided to click on it. It started opening all kinds of files from within Excel. Over 200 and still counting when he called me. I told him to go to task manager, which showed a LOT of files in the applications tab, but only one Excel.exe in the processes tab. Closing it down there, closed down Excel. I then CrossLooped in to see if I could give him a helping hand. Each time Excel was re-opened, the mass influx of files started. They were all kinds of files, PDFs, Docs, JPGs, even some spreadsheets. It looked like the end of solitaire, with multiple windows opening (XP) and the counter on the lone Excel button on the task bar counting off the files. I did the task manager exit routine and went looking for temp files. I CrapCleaned out the system. Made sure I went through the files created in the last hour and deleted anything with a temp anywhere in it. I also deleted the crappy infected/corrupted file from it's place on the desktop (yeah, I know, I yelled for 15 minutes on THAT subject). Despite a delousing, the restart of Excel, which complained of a deactivated add-in, would start the cascading windows, whether I answered yes or no to that question. Yes, it knew it had a serious crash, but why would it just keep on trying to load the bad file, even when I got rid of it? But here's the real question. WHERE was it loading from? I went through the backup folder and NOTHING was there! So what's the process for starting Excel WITHOUT it trying to do a crash recovery? Sort of makes me feel stupid at times. Thanks for any light you can shed on this issue. GM

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