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• How do you go about finding out whether an idea you've had has already been patented?

  - by Iain Fraser

  I have an idea for image copy-protection that I'm in the process of coding up and plan on selling to one of my clients who sells images online. If successful I think there would be a lot of people in a similar situation to my client who would be interested in the code also. I think this is a fairly unique idea that could be packaged into a saleable product - but if I did do this, I wouldn't want some big corporation decending on me with their lawyers after all my hard work. So before I put too much work into this I'd really like to know how I'd go about finding if this idea has been patented already and whether I'd get in trouble if I sold my product and if it would be worthwhile patenting the idea myself. Although I find the idea of software patenting abhorrent, it would be more to protect myself from the usual suspects than to stop fellow-developers from using the idea (if it is in fact a worthwhile one). I live in Australia, so an idea of who to go and see and a ball park figure of how much money I'd be looking at having to pay would be fantastic (in orders of a magnitude: 100s, 1000s, 10s of thousands of dollars, etc). Cheers Iain

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• Multithreading and Interrupts

  - by Nicholas Flynt

  I'm doing some work on the input buffers for my kernel, and I had some questions. On Dual Core machines, I know that more than one "process" can be running simultaneously. What I don't know is how the OS and the individual programs work to protect collisions in data. There are two things I'd like to know on this topic: (1) Where do interrupts occur? Are they guaranteed to occur on one core and not the other, and could this be used to make sure that real-time operations on one core were not interrupted by, say, file IO which could be handled on the other core? (I'd logically assume that the interrupts would happen on the 1st core, but is that always true, and how would you tell? Or perhaps does each core have its own settings for interrupts? Wouldn't that lead to a scenario where each core could react simultaneously to the same interrupt, possibly in different ways?) (2) How does the dual core processor handle opcode memory collision? If one core is reading an address in memory at exactly the same time that another core is writing to that same address in memory, what happens? Is an exception thrown, or is a value read? (I'd assume the write would work either way.) If a value is read, is it guaranteed to be either the old or new value at the time of the collision? I understand that programs should ideally be written to avoid these kinds of complications, but the OS certainly can't expect that, and will need to be able to handle such events without choking on itself.

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• Does DefaultAppPool run with special elevated privilegs on IIS?

  - by Leeks and Leaks

  I'm running a piece of code within a web page that queries the IIS metabase using ADSI. The code is as simple as this: DirectoryEntry iisNode = new DirectoryEntry("/LM/W3SVC/1/ROOT/MyAspWebsite-1-128886021498831845"); foreach (DirectoryEntry de in iisNode.Parent.Children) { System.Console.WriteLine(de.Name); } This works fine when I run the page/site under the DefaultAppPool on IIS7/W2K8. However when I create my own app pool and leave the properties the same as the default app pool, this code fails with the following error: Caught: System.Runtime.InteropServices.COMException Failed to parse virtual directory: /LM/W3SVC/1/ROOT/MyAspWebsite-1-128889542757187500 System.Runtime.InteropServices.COMException (0x80070005): Access is denied. What special privileges does the DefaultAppPool have? I don't see any documented. I need this to work in non default app pools, but without giving the entire worker process elevated privileges. I've also tried using the username and password parameters of the DirectoryEntry constructor, by using the Admin on the machine that IIS7 is running on, but that didn't change anything. I'll also note that this works fine on IIS6 and W2K3. Any help is appreciated.

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• How do the XMPP modules work in perl?

  - by TheGNUGuy

  Hey everybody, I am trying to make my own jabber bot but i have run into a little trouble. I have gotten my bot to respond to messages, however, if I try to change the bot's presence then it seems as though all of the messages you send to the bot get delayed. What I mean is when I run the script I change the presence so I can see that it is online. Then When I send it a message it takes 3 before the callback subroutine i have set up for messages gets called. After the 3rd message is sent and the chat subroutine is called it still process the first message I sent. This really doesn't pose TOO much of a problem except that I have it set up to log out when I send the message "logout" and it has to be followed by two more messages in order to log out. I am not sure what it is that I have to do to fix this but i think it has something to do with iq packets because I have an iq callback set as well and it gets called 2 times after setting the presence. Here is my source code: http://pastebin.com/MgKMhTML Thanks for your help!

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• What is causing my HTTP server to fail with "exit status -1073741819"?

  - by Keeblebrox

  As an exercise I created a small HTTP server that generates random game mechanics, similar to this one. I wrote it on a Windows 7 (32-bit) system and it works flawlessly. However, when I run it on my home machine, Windows 7 (64-bit), it always fails with the same message: exit status -1073741819. I haven't managed to find anything on the web which references that status code, so I don't know how important it is. Here's code for the server, with redundancy abridged: package main import ( "fmt" "math/rand" "time" "net/http" "html/template" ) // Info about a game mechanic type MechanicInfo struct { Name, Desc string } // Print a mechanic as a string func (m MechanicInfo) String() string { return fmt.Sprintf("%s: %s", m.Name, m.Desc) } // A possible game mechanic var ( UnkillableObjects = &MechanicInfo{"Avoiding Unkillable Objects", "There are objects that the player cannot touch. These are different from normal enemies because they cannot be destroyed or moved."} //... Race = &MechanicInfo{"Race", "The player must reach a place before the opponent does. Like \"Timed\" except the enemy as a \"timer\" can be slowed down by the player's actions, or there may be multiple enemies being raced against."} ) // Slice containing all game mechanics var GameMechanics []*MechanicInfo // Pseudorandom number generator var prng *rand.Rand // Get a random mechanic func RandMechanic() *MechanicInfo { i := prng.Intn(len(GameMechanics)) return GameMechanics[i] } // Initialize the package func init() { prng = rand.New(rand.NewSource(time.Now().Unix())) GameMechanics = make([]*MechanicInfo, 34) GameMechanics[0] = UnkillableObjects //... GameMechanics[33] = Race } // serving var index = template.Must(template.ParseFiles( "templates/_base.html", "templates/index.html", )) func randMechHandler(w http.ResponseWriter, req *http.Request) { mechanics := [3]*MechanicInfo{RandMechanic(), RandMechanic(), RandMechanic()} if err := index.Execute(w, mechanics); err != nil { http.Error(w, err.Error(), http.StatusInternalServerError) } } func main() { http.HandleFunc("/", randMechHandler) if err := http.ListenAndServe(":80", nil); err != nil { panic(err) } } In addition, the unabridged code, the _base.html template, and the index.html template. What could be causing this issue? Is there a process for debugging a cryptic exit status like this?

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• Fetching real time data from excel

  - by Umesh Sharma

  I am seriouly looking for your valuable help first time here. If possible, plese help me. I am developing a VB.NET app in which i read "real time data" from a excel sheet using "Microsoft.Office.Interop.Excel" i.e. excel automation. All cells in excel sheet are fetching stock data from some LOCAL DDE Server like "=XYZ|Bid!GOLD", "=XYZ|Bid!SILVER", "=XYZ|Ask!SILVER" and so on... Some cells also having fixed values like "Symbol", "Bid Rate", "32.90" etc. Values of DDE mapped cells (i.e. =XYZ|xxxx!yyy) are continuously changing. THE PROBLEM is here..."FIXED values" from excel cells are coming quite ok to my app but all DDE mapped cells values are coming "-2146826246" (When datasource local dde server ON) or "-2146826265" (OFF). Although, if i use C#.NET, it's all ok but not with Vb.NET. I want to display range of excel (A1 to J50) into VB.NET ListView which are changing in every 200ms (5 times in every 1 second) ================ Important ====================================================== Is it possible to BIND "listview items/columns values" with "excel cells" or some local memory variables ?? Currently, i am reading excel "cell by cell" and trying to put values in .NET listview but CPU USES are very high as well as it's toooo slow process. If yes, then how please ? I am a VFP developer but new to .NET It's very easy in VFP then why not in .NET ?? Please guide me, if someone has the solution...

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• Stack Overflow on Marshal.PtrToStructure reading wmv files

  - by Nick Udell

  Hi, I'm using a frame grabber class in order to capture and process each frame in a video. The class can be found here: http://www.codeproject.com/KB/graphics/FrameGrabber.aspx I'm having issues with running it, however. When loading the file, it attempts to marshal a video format pointer into a VideoInfoHeader (I'm using DirectShow.Net). The code that does this is as follows: videoInfo = (VideoInfoHeader)Marshal.PtrToStructure(mediaType.formatPtr, typeof(VideoInfoHeader)); When I run this it immediately crashes out of the debugging environment, probably with a stack overflow. When stepping through I can see that the formatPtr always equals 93, though I do not know what to make of this as I am fairly new to marshalling. I have checked that the video runs fine in Windows Media Player. This is essential in finding the dimensions of the video and also the size of the header, which needs to be skipped before the frames can be read. I am running Windows 7 x64. Any help on this would be much appreciated, I must've tried fifteen different frame grabbing techniques.

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• Delphi Application using COMMIT and ROLLBACK for Multiple SQL Updates

  - by Matt

  Is it possible to use the SQL BEGIN TRANSACTION, COMMIT TRANSACTION, ROLLBACK TRANSACTION when embedding SQL Queries into an application with mutiple calls to the SQL for Table Updates. For example I have the following code: Q.SQL.ADD(<UPDATE A RECORD>); Q.ExecSQL; Q.Close; Q.SQL.Clear; Q.SQL.ADD(<Select Some Data>); Q.Open; Set Some Variables Q.Close; Q.SQL.Clear; Q.SQL.ADD(<UPDATE A RECORD>); Q.ExecSQL; What I would like to do is if the second update fails I want to roll back the first transaction. If I set a unique notation for the BEGIN, COMMIT, ROLLBACK so as to specify what is being committed or rolled back, is it feasible. i.e. before the first Update specify BEGIN TRANSACTION_A then after the last update specify COMMIT TRANSACTION_A I hope that makes sense. If I was doing this in a SQL Stored Procedure then I would be able to specify this at the start and end of the procedure, but I have had to break the code down into manageable chunks due to process blocks and deadlocks on a heavy loaded SQL Server.

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• How to solve concurrency problems in ASP.NET Windows-Workflow and ActiveRecord/NHibernate?

  - by Famous Nerd

  I have found that ActiveRecord uses the Session-Scope object within the ASP.NET application and that if the web-site is read-write we can have a tug-o-war between the Workflow's own Data-Access SessionScope and that of the ASP.NET site. I would really like to have the WindowsWorkflow Runtime use the same object session as the web-site however, they have different lifetimes. Sometimes, a web-request may save a very simple piece of data which would execute quickly however, if the web-site kicks off a workflow process.. how can that workflow make data-modifications while still allowing the Appliaction_EndRequest to dispose the ASP.NET SessionScope ... it's like ownership of the SessionScope should be shared between the workflow runtime and the ASP.NET website. Manual Workflow Scheduler may be the Savior... if a workflow is synchronous and merely uses CallExternalMethod to interact with the Host then we could constrain all the data-access to the host.. then the sessionScope can exist once. This however, won't solve the problem of a delay activity... if this delay fires, we could need to update data... in this case we'd need an isolated Session Scope and concurrency may arise. This however, differs from SharePoint workflows where it seems that the SharePoint workflow can save data from the web and the workflow and that concurrency is handled through other means. Can anyone offer any suggestions on how to allow the workflow to manage data and play nice with ASP.NET web sites?

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• On Windows 7: Same path but Explorer & Java see different files than Powershell

  - by Ukko

  Submitted for your approval, a story about a poor little java process trapped in the twilight zone... Before I throw up my hands and just say that the NTFS partition is borked is there any rational explanation of what I am seeing. I have a file with a path like this C:\Program Files\Company\product\config\file.xml I am reading this file after an upgrade and seeing something wonky. Eclipse and my Java app are still seeing the old version of this file while some other programs see the new version. The test that convinced my it was not my fat finger that caused the problem was this: In Explorer I entered the above path and Explorer displayed the old version of the file. Forcing Explorer to reload via Ctrl-F5 still yields the old version. This is the behavior I get in Java. Now in PowerShell I enter more "C:\Program Files\Company\product\config\file.xml" I cut and past the path from Explorer to make sure I am not screwing anything up and it shows me the new version of the file. So for the programming aspect of this, is there a cache or some system component that would be storing this stale reference. Am I responsible for checking or reseting that for some class of files. I can imagine somebody being "creative" in how xml files are processed to provide some bell or whistle. But it could be a case of just being borked. Any insights appreciated...Thanks!

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• Quality assurance in small developer teams

  - by Kim L

  Ideally, in a project you will developers, testers, QA manager(s) etc which all make their contribution to the quality of the code. But what if you don't have that kind of resources? If you just have, for example, three developers and don't have the resources to hire a full time QA manager, how do you assure that the code quality meets set standards? What kind of things do you pay attention to in quality assurance? Quality isn't just about the code doing what it is supposed to do (code is properly tested with automatic tests). Quality is also about the code being clean (readable, maintainable, well structured, documented, etc). I'm looking forward to hear what kind of processes you have applied to your team to assure that the quality meets the set standards. We've applied a process where we rotate the QA role between the developers. Each developer is responsible for QA one week at a time. Each changeset is revised and checked that existing tests pass, required new tests have been written, that the code is clean and, of course, that the project builds.

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• What is your workflow when designing HTML/CSS layouts?

  - by DMin

  I have been working with PHP/MySQL as a hobby for close to a couple of years now, I have been working with photoshop for a very long time, I know CSS & HTML well enough to write without any reference, so, I would not consider myself someone who's very new at this. I have recently started developing websites professionally - (only person working on the project). I have seen the power of Joomla and how you can make a website ready for your customer in a matter of hours(if not minutes). I find it very hard to make layouts that remotely look like the themes on joomla. I find making even simple layouts a very cumbersome process and takes a lot of time to get a good enough output. I have a feeling I may not be using the right tools or workflow for the job. What I wanted to findout was, as part of the industry : How do, you, make your website when you do it from scratch? What are the tools that you use? What is your workflow? Just noted a few things I know already, for your reference(You can skip this if you like) I have seen the export for web for Photoshop that exports CSS - but (as far as I know) exports only absolutely positioned webpages so they need to be beaten and fixed if you want to use them for example for joomla. I have used the SiteGrinder plugin for Photoshop that exports HTML/CSS. It looks promising but haven't tried it extensively. One of the tools that save loads of time is FireBug. This makes it easy to edit html and css on the fly and get the page looking exactly as you want it. Recently stumbled upon fireworks. But haven't explored it much. Thanks! :)

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• Neural Network with softmax activation

  - by Cambium

  This is more or less a research project for a course, and my understanding of NN is very/fairly limited, so please be patient :) ============== I am currently in the process of building a neural network that attempts to examine an input dataset and output the probability/likelihood of each classification (there are 5 different classifications). Naturally, the sum of all output nodes should add up to 1. Currently, I have two layers, and I set the hidden layer to contain 10 nodes. I came up with two different types of implementations 1) Logistic sigmoid for hidden layer activation, softmax for output activation 2) Softmax for both hidden layer and output activation I am using gradient descent to find local maximums in order to adjust the hidden nodes' weights and the output nodes' weights. I am certain in that I have this correct for sigmoid. I am less certain with softmax (or whether I can use gradient descent at all), after a bit of researching, I couldn't find the answer and decided to compute the derivative myself and obtained softmax'(x) = softmax(x) - softmax(x)^2 (this returns an column vector of size n). I have also looked into the MATLAB NN toolkit, the derivative of softmax provided by the toolkit returned a square matrix of size nxn, where the diagonal coincides with the softmax'(x) that I calculated by hand; and I am not sure how to interpret the output matrix. I ran each implementation with a learning rate of 0.001 and 1000 iterations of back propagation. However, my NN returns 0.2 (an even distribution) for all five output nodes, for any subset of the input dataset. My conclusions: o I am fairly certain that my gradient of descent is incorrectly done, but I have no idea how to fix this. o Perhaps I am not using enough hidden nodes o Perhaps I should increase the number of layers Any help would be greatly appreciated! The dataset I am working with can be found here (processed Cleveland): http://archive.ics.uci.edu/ml/datasets/Heart+Disease

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• Practices for keeping JavaScript and CSS in sync?

  - by Rene Saarsoo

  I'm working on a large JavaScript-heavy app. Several pieces of JavaScript have some related CSS rules. Our current practice is for each JavaScript file to have an optional related CSS file, like so: MyComponent.js // Adds CSS class "my-comp" to div MyComponent.css // Defines .my-comp { color: green } This way I know that all CSS related to MyComponent.js will be in MyComponent.css. But the thing is, I all too often have very little CSS in those files. And all too often I feel that it's too much effort to create a whole file to just contain few lines of CSS - it would be easier to just hardcode the styles inside JavaScript. But this would be the path to the dark side... Lately I've been thinking of embedding the CSS directly inside JavaScript - so it could still be extracted in the build process and merged into one large CSS file. This way I wouldn't have to create a new file for every little CSS-piece. Additionally when I move/rename/delete the JavaScript file I don't have to additionally move/rename/delete the CSS file. But how to embed CSS inside JavaScript? In most other languages I would just use string, but JavaScript has some issues with multiline strings. The following looks IMHO quite ugly: Page.addCSS("\ .my-comp > p {\ font-weight: bold;\ color: green;\ }\ "); What other practices have you for keeping your JavaScript and CSS in sync?

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• Efficient data importing?

  - by Kevin

  We work with a lot of real estate, and while rearchitecting how the data is imported, I came across an interesting issue. Firstly, the way our system works (loosely speaking) is we run a Coldfusion process once a day that retrieves data provided from an IDX vendor via FTP. They push the data to us. Whatever they send us is what we get. Over the years, this has proven to be rather unstable. I am rearchitecting it with PHP on the RETS standard, which uses SOAP methods of retrieving data, which is already proven to be much better than what we had. When it comes to 'updating' existing data, my initial thought was to query only for data that was updated. There is a field for 'Modified' that tells you when a listing was last updated, and the code I have will grab any listing updated within the last 6 hours (give myself a window in case something goes wrong). However, I see a lot of real estate developers suggest creating 'batch' processes that run through all listings regardless of updated status that is constantly running. Is this the better way to do it? Or am I fine with just grabbing the data I know I need? It doesn't make a lot of sense to me to do more processing than necessary. Thoughts?

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• Problem with Silverlight 3 projects in Web Developer Express 2008

  - by MNT

  Hi, I have a strange problem when working with silverlight 3 projects in Web Developer Express 2008. Mainly, I cannot show the design view of a XAML file. Also the XAML files (markup) are shown as plain text files (No Syntax coloring & No Intellisense). However I can write an application that is compiled and run successfully. I have the following installed on my machine: Windows XP SP3 Visual Web Developer Express 2008 SP1 & .NET 3.5 SP1 SL3 Requirements I had a few problems while installing SL3 SDK & Tool for VS. I repeated the process many times until the installation succeeded. The main problem was in the "SL Tools for VS" installation where I used to get an error in the middle. My workaround was to extract the MSI file and manually run the VWDxxx installer from the extracted files. Is this the cause of the problem? Kindly advise as it's impractical to work w/o Intellisense. Thnak you

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• Java Applet not caching

  - by John Fogerty

  Hello world, I'm having a problem with a Java applet I've deployed that is refusing to be cached in the jvm's "sticky" cache (or by the browser). For some reason every time a user loads the page this applet is on, the jvm re-downloads the jar file from the server which causes a long delay. The webpage containing the applet is being accessed via the internet, so according to Sun's Java applet documentation I'm using an <applet> tag rather than an <object> or <embed> tag. Any help debugging or identifying the problem would be much appreciated. Below is the full applet tag I'm using: <applet alt="Scanning Applet failed to load" archive="scanning.jar" code="scanning.scanlet.class" codebase="/java/" codetype="application/java" height="30" mayscript="True" name="scanlet" width="200"> <param name="domain" value="192.168.12.23" /> <param name="publishName" value="scan_attachment" /> <param name="publishURL" value="http://192.168.12.23/draft/update/52" /> <param name="curURL" value="http://192.168.12.23/draft/edit/52" /> Your browser is unable to process the Java &lt;APPLET&gt; tag needed to display this applet <br /> One solution would be to download a better web browser like <a href="http://www.mozilla.com/firefox">Mozilla's Firefox</a> </applet>

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• I'v installed NetBeans 6.8 on my MacOS X MacBook and the logs say it cannot be run, any ideas?

  - by codezealot

  I've installed NetBeans 6.8 on my MacBook, and the installation results indicated success. However, every single time I attempt to run the application is shuts down. I monitored the process and noticed the following entries in the console that imply the application cannot be found? 3/19/10 10:20:20 PM [0x0-0x22022].org.netbeans.ide.baseide.200912041610[22168] /Applications/NetBeans/NetBeans 6.8.app/Contents/MacOS/netbeans: line 57: dirname: command not found 3/19/10 10:20:20 PM [0x0-0x22022].org.netbeans.ide.baseide.200912041610[22168] Cannot read cluster file: /../etc/netbeans.clusters 3/19/10 10:20:20 PM com.apple.launchd.peruser.501[77] ([0x0-0x22022].org.netbeans.ide.baseide.200912041610[22168]) Exited with exit code: 1 I started researching how to set the default JDK for use by NetBeans, and found repeated use of the following command line entry; netbeans --jdkhome /System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Home -- from http://wiki.netbeans.org/JDKVersionAndMacOS When I attempt the command line above, I receive "netbeans command not found". So do I ... 1.) Need to create a command called "netbeans" that points to my install location for NetBeans 6.8? If so how do I do that? 2.) How do I get to the netbeans.conf file for NetBeans 6.8, does one even exist for it? It gets even more interesting, the above happens with Eclipse as well. Yippie.

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• How to query two tables based on whether or not record exists in a third?

  - by Katherine

  I have three tables, the first two fairly standard: 1) PRODUCTS table: pid pname, etc 2) CART table: cart_id cart_pid cart_orderid etc The third is designed to let people save products they buy and keep notes on them. 3) MYPRODUCTS table: myprod_id myprod_pid PRODUCTS.prod_id = CART.cart_prodid = MYPRODUCTS.myprod_pid When a user orders, they are presented with a list of products on their order, and can optionally add that product to myproducts. I am getting the info necessary for them to do this, with a query something like this for each order: SELECT cart.pid, products.pname, products.pid FROM products, cart WHERE products.pid = cart_prodid AND cart_orderid=orderid This is fine the first time they order. However, if they subsequently reorder a product which they have already added to myproducts, then it should NOT be possible for them to add it to myproducts again - basically instead of 'Add to MyProducts' they need to see 'View in MyProducts'. I am thinking I can separate the products using two queries: Products never added to MyProducts By somehow identifying whether the user has the product in MyProducts already, and if so excluding it from the query above. Products already in MyProducts By reversing the process above. I need some pointers on how to do this though.

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• can a OOM be caused by not finding enough contiguous memory?

  - by raticulin

  I start some java code with -Xmx1024m, and at some point I get an hprof due to OOM. The hprof shows just 320mb, and give me a stack trace: at java.util.Arrays.copyOfRange([CII)[C (Arrays.java:3209) at java.lang.String.<init>([CII)V (String.java:215) at java.lang.StringBuilder.toString()Ljava/lang/String; (StringBuilder.java:430) ... This comes from a large string I am copying. I remember reading somewhere (cannot find where) what happened is these cases is: process still has not consumed 1gb of memory, is way below even if heap still below 1gb, it needs some amount of memory, and for copyOfRange() it has to be continuous memory, so even if it is not over the limit yet, it cannot find a large enough piece of memory on the host, it fails with an OOM. I have tried to look for doc on this (copyOfRange() needs a block of continuous memory), but could not find any. The other possible culprit would be not enough permgen memory. Can someone confirm or refute the continuous memory hypothesis? Any pointer to some doc would help too.

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• Code Explanation (MPICH)

  - by user243680

  #include "mpi.h" #include <stdio.h> #include <math.h> double f(double a) { return (4.0 / (1.0 + a*a)); } void main(int argc, char *argv[]) { int done = 0, n, myid, numprocs,i; double PI25DT = 3.141592653589793238462643; double mypi, pi, h, sum, x; double startwtime, endwtime; int namelen; char processor_name[MPI_MAX_PROCESSOR_NAME]; MPI_Init(&argc,&argv); MPI_Comm_size(MPI_COMM_WORLD,&numprocs); MPI_Comm_rank(MPI_COMM_WORLD,&myid); MPI_Get_processor_name(processor_name,&namelen); fprintf(stderr,"Process %d on %s\n", myid, processor_name); fflush(stderr); n = 0; while (!done) { if (myid == 0) { printf("Enter the number of intervals: (0 quits) ");fflush(stdout); scanf("%d",&n); startwtime = MPI_Wtime(); } MPI_Bcast(&n, 1, MPI_INT, 0, MPI_COMM_WORLD); if (n == 0) done = 1; else { h = 1.0 / (double) n; sum = 0.0; for (i = myid + 1; i <= n; i += numprocs) { x = h * ((double)i - 0.5); sum += f(x); } mypi = h * sum; MPI_Reduce(&mypi, &pi, 1, MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD); if (myid == 0) { printf("pi is approximately %.16f, Error is %.16f\n", pi, fabs(pi - PI25DT)); endwtime = MPI_Wtime(); printf("wall clock time = %f\n", endwtime-startwtime); } } } MPI_Finalize(); } Can anyone explain me the above code what it does??I am in lab and my miss has asked me to explain and i dont know what it is.please help

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• System.ArgumentException: Invalid hex character at DecryptAssemblyResource

  - by Radu094

  My webapp is trowing these exceptions intermitently ever since we migrated to Mono + Apache: The error sounds more like a problem reading/processing some assembly, so I was wondering if I should be worried that there might be a problem with the hard-drive? System.ArgumentException: Invalid hex character at System.Web.Configuration.MachineKeySectionUtils.ToHexValue (Char c, Boolean high) [0x00000] in <filename unknown>:0 at System.Web.Configuration.MachineKeySectionUtils.GetBytes (System.String key, Int32 len) [0x00000] in <filename unknown>:0 at System.Web.Handlers.ScriptResourceHandler.GetBytes (System.String val) [0x00000] in <filename unknown>:0 at System.Web.Handlers.ScriptResourceHandler.DecryptAssemblyResource (System.String val, System.String& asmName, System.String& resName) [0x00000] in <filename unknown>:0 at System.Web.Handlers.ScriptResourceHandler.ProcessRequest (System.Web.HttpContext context) [0x00000] in <filename unknown>:0 at System.Web.Handlers.ScriptResourceHandler.System.Web.IHttpHandler.ProcessRequest (System.Web.HttpContext context) [0x00000] in <filename unknown>:0 at System.Web.HttpApplication+<Pipeline>c__Iterator2.MoveNext () [0x00000] in <filename unknown>:0 at System.Web.HttpApplication.Tick () [0x00000] in <filename unknown>:0 Method: Void Application_Error(System.Object, System.EventArgs) at File: at Line Number: 0 Method: Void ProcessError(System.Exception) at File: at Line Number: 0 Method: Void Tick() at File: at Line Number: 0 Method: Void Start(System.Object) at File: at Line Number: 0 Method: Void System.Web.IHttpHandler.ProcessRequest(System.Web.HttpContext) at File: at Line Number: 0 Method: Void Process(System.Web.HttpWorkerRequest) at File: at Line Number: 0 Method: Void RealProcessRequest(System.Object) at File: at Line Number: 0 Method: Void ProcessRequest(System.Web.HttpWorkerRequest) at File: at Line Number: 0 Method: Void ProcessRequest() at File: at Line Number: 0 Method: Void ProcessRequest(Mono.WebServer.MonoWorkerRequest) at File: at Line Number: 0 Method: Void ProcessRequest(Int32, System.String, System.String, System.String, System.String, System.String, Int32, System.String, Int32, System.String, System.String[], System.String[], System.Object) at File: at Line Number: 0 Method: Void InnerRun(System.Object) at File: at Line Number: 0 Method: Void Run(System.Object) at File: at Line Number: 0

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• How to exclude a folder in svn checkout in maven?

  - by Udo Fholl

  Hi all, Im using maven to checkout some projects. I don't want maven to checkout a folder. But it seems to ignore the excludes tag in configuration. This is the svn structure: trunk/ | L_ folder_to_include | L_ folder_to_ignore And here it goes a sample of the pom.xml: <execution> <id>checkout_application</id> <configuration> <connectionUrl>hostname</connectionUrl> <checkoutDirectory>checkout_folder</checkoutDirectory> <excludes>folder_to_ignore</excludes> </configuration> <phase>process-resources</phase> <goals> <goal>checkout</goal> </goals> </execution> Sorry for the poor formatting and my english. I wasn't able to insert proper tabulation (four spaces?). Thank you! Udo.

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• Django sphinx works only after app restart.

  - by Lhiash

  Hi, I've set up django-sphinx in my project, which works perfectly only for some time. Later it always returns empty result set. Surprisingly restarting django app fixes it. And search works again but again only for short time (or very limiter number of queries). Heres my sphinx.conf: source src_questions { # data source type = mysql sql_host = xxxxxx sql_user = xxxxxx #replace with your db username sql_pass = xxxxxx #replace with your db password sql_db = xxxxxx #replace with your db name # these two are optional sql_port = xxxxxx #sql_sock = /var/lib/mysql/mysql.sock # pre-query, executed before the main fetch query sql_query_pre = SET NAMES utf8 # main document fetch query sql_query = SELECT q.id AS id, q.title AS title, q.tagnames AS tags, q.html AS text, q.level AS level \ FROM question AS q \ WHERE q.deleted=0 \ # optional - used by command-line search utility to display document information sql_query_info = SELECT title, id, level FROM question WHERE id=$id sql_attr_uint = level } index questions { # which document source to index source = src_questions # this is path and index file name without extension # you may need to change this path or create this folder path = /home/rafal/core_index/index_questions # docinfo (ie. per-document attribute values) storage strategy docinfo = extern # morphology morphology = stem_en # stopwords file #stopwords = /var/data/sphinx/stopwords.txt # minimum word length min_word_len = 3 # uncomment next 2 lines to allow wildcard (*) searches min_infix_len = 1 enable_star = 1 # charset encoding type charset_type = utf-8 } # indexer settings indexer { # memory limit (default is 32M) mem_limit = 64M } # searchd settings searchd { # IP address on which search daemon will bind and accept # optional, default is to listen on all addresses, # ie. address = 0.0.0.0 address = 127.0.0.1 # port on which search daemon will listen port = 3312 # searchd run info is logged here - create or change the folder log = ../log/sphinx.log # all the search queries are logged here query_log = ../log/query.log # client read timeout, seconds read_timeout = 5 # maximum amount of children to fork max_children = 30 # a file which will contain searchd process ID pid_file = searchd.pid # maximum amount of matches this daemon would ever retrieve # from each index and serve to client max_matches = 1000 } and heres my search part from views.py: content = Question.search.query(keywords) if level: content = content.filter(level=level)#level is array of integers There are no errors in any logs, it just isnt returning any results. All help would be most appreciated.

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• Appending data to NSFetchedResultsController during find or create loop

  - by Justin Williams

  I have a table view that is managed by an NSFetchedResultsController. I am having an issue with a find-or-create operation, however. When the user hits the bottom of my table view, I am querying my server for another batch of content. If it doesn't exist in the local cache, we create it and store it. If it does exist, however, I want to append that data to the fetched results controller and display it. I can't quite figure that part out. Here's what I'm doing thus far: Passing the returned array of values from my server to an NSOperation to process. In the operation, create a new managed object context to work with. In the operation, I iterate through the array and execute a fetch request to see if the object exists (based on its server id). If the object doesn't exist, we create it and insert it into the operations' managed object context. After the iteration completes, we save the managed object context, which triggers a merge notification on my main thread. At this point, any objects that weren't locally cached in my Core Data store before will appear, but the ones that previously existed do not come along for the ride. I feel like it's something simple I'm missing, and could use a nudge in the right direction.

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