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• Colour Name to RGB/Hex/HSL/HSV etc

  - by Abs

  Hello all, I have come across this great function/command. Colour to RGB, you can do this: col2rgb("peachpuff") //returns hex It will return one hex value. I want to extend this using Perl, Python or PHP but I want to be able to pass in, for example, "yellow" and the function returns all types of yellows - their hex/rgb/?/etc value. I already have a quick solution implemented, which involves mapping colour names to hex values but now I want to get more precise and use some formulas etc to determine what's what. However, as usual, I don't have a clue on how to do this! So I appreciate any implementation advice on how to do this. Thanks all

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• javamail vs sendmail performance during bulk email

  - by Glenn2041

  Hi all, I'm writing a Java mass emailer application to send out emails to send between 50,000 to 100,000 a day to users. The current plan is to delegate the sending to delegate to sendmail (on the local unix server). From our testing sendmail is sending a maximum of 5 emails per second. Would JavaMail be a faster option? Does anyone know what a faster way to send emails. We want to get this process out as quick as possible. Edit: BTW, a pdf will be attached too

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• async handler deleted by the wrong thread in django

  - by user3480706

  I'm run this algorithm in my django application.when i run several time from my GUI django local server will stopped and i got this error Exception RuntimeError: RuntimeError('main thread is not in main loop',) in ignored Tcl_AsyncDelete: async handler deleted by the wrong thread Aborted (core dumped) code print "Learning the sin function" network =MLP.MLP(2,10,1) samples = np.zeros(2000, dtype=[('x', float, 1), ('y', float, 1)]) samples['x'] = np.linspace(-5,5,2000) samples['y'] = np.sin(samples['x']) #samples['y'] = np.linspace(-4,4,2500) for i in range(100000): n = np.random.randint(samples.size) network.propagate_forward(samples['x'][n]) network.propagate_backward(samples['y'][n]) plt.figure(figsize=(10,5)) # Draw real function x = samples['x'] y = samples['y'] #x=np.linspace(-6.0,7.0,50) plt.plot(x,y,color='b',lw=1) samples1 = np.zeros(2000, dtype=[('x1', float, 1), ('y1', float, 1)]) samples1['x1'] = np.linspace(-4,4,2000) samples1['y1'] = np.sin(samples1['x1']) # Draw network approximated function for i in range(samples1.size): samples1['y1'][i] = network.propagate_forward(samples1['x1'][i]) plt.plot(samples1['x1'],samples1['y1'],color='r',lw=3) plt.axis([-2,2,-2,2]) plt.show() plt.close() return HttpResponseRedirect('/charts/charts') how can i fix this error ?need a quick help

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• Build and render infinite hierarchical category tree from self-referential category table

  - by FreshCode

  I have a Categories table in which each category has a ParentId that can refer to any other category's CategoryId that I want to display as multi-level HTML list, like so: <ul class="tree"> <li>Parent Category <ul> <li>1st Child Category <!-- more sub-categories --> </li> <li>2nd Child Category <!-- more sub-categories --> </li> </ul> </li> </ul> Presently I am recursively rendering a partial view and passing down the next category. It works great, but it's wrong because I'm executing queries in a view. How can I render the list into a tree object and cache it for quick display every time I need a list of all hierarchical categories?

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• Boost asio async vs blocking reads, udp speed/quality

  - by Dolphin

  I have a quick and dirty proof of concept app that I wrote in C# that reads high data rate multicast UDP packets from the network. For various reasons the full implementation will be written in C++ and I am considering using boost asio. The C# version used a thread to receive the data using blocking reads. I had some problems with dropped packets if the computer was heavily loaded (generally with processing those packets in another thread). What I would like to know is if the async read operations in boost (which use overlapped io in windows) will help ensure that I receive the packets and/or reduce the cpu time needed to receive the packets. The single thread doing blocking reads is pretty straightforward, using the async reads seems like a step up in complexity, but I think it would be worth it if it provided higher performance or dropped fewer packets on a heavily loaded system. Currently the data rate should be no higher than 60Mb/s.

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• Upgrading from SQL Server 2008 Express to 2008 Developer

  - by josecortesp

  Hey Guys, this one is a quick Question: What is the best (or THE) way to change my SQL Express 2008 (with advance...) installation to a 2008 Developer edition? I need to keep the databases, along with the logins and so on. I need to upgrade because, I Want to use all the features in TFS 2010. Do I have to make backups of all the data and uninstall express - install developer? Is there a quicker way? Thanks in advance SOLVED: In the SQL Server Installation Center, there a Edition Upgrade options found under Maintenance. The only thing is that you have to choose processor type as x86 (as Express is only x86) in the options in the Installation Center. Now my SQL Server is developer...

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• Middleware for MongoDB or CouchDB with jQuery Ajax/JSON frontend

  - by Tauren

  I've been using the following web development stack for a few years: java/spring/hibernate/mysql/jetty/wicket/jquery For certain requirements, I'm considering switching to a NoSQL datastore with an AJAX frontend. I would probably build the frontend with jQuery and communicate with the web application middleware using JSON. I'm leaning toward MongoDB because of more dynamic query capabilities, but am still considering CouchDB. I'm not sure what to use in the middle. Probably something RESTful? My preference is to stick with Java (or maybe Scala or Groovy) since I'm using tools like Drools for rules and Shiro for security. But then again, I want to pick something that is quick an easy to work with, so I'm open to other solutions. If you are building ajax/json/nosql solutions, I'd like to hear details about what tools you are using and any pros/cons you've found to using them. Thanks!

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• OJB Reference Descriptor 1:0 relationship? Should I set auto-retrieve to false?

  - by godzillasdm

  Hi, I am having an issue while using Apache OJB with Spring 2 inside my web app. I'm using OJB reference-descriptor with 2 foreign key properties. I have an object A (parent) and object B (referenced object). The thing is, for an object A, there may or may not be an object B. In the case where there is no object B to go with Object A, the object B seems to be instantiated (through Spring?) anyways. However, I am unable to access object B's members. Whenever I test if Object B == null, it always returns false even though there is no matching value in the database. Since this Object is never null, I figured I can test the object's member like so: if( objectb.getDocumentNumber == null) { return false; } However, I get an exception in the jsp: javax.servlet.jsp.el.ELException: An error occurred while getting property "documentNumber" from an instance class org.sample.pojo.Objectb$$EnhancerByCGLIB$$78022a2 and this exception in the debugger when it's creating the objectB: com.sun.jdi.InvocationException occurred invoking method. I am guessing that the reference-descriptor must be a 1:1+ relationship, instead of a 1:0+ relationship. I was wondering if I should set the property 'auto-retrieve' to false, and then use the PersistenceBroker.retrieveAllReferences(Object obj); method as directed. However, this method's return value is 'void', so I am guessing that Spring somehow creates, and sets the reference class for me. (Returning me back to the same issue I'm having.) I will need a way to test whether the reference object exists first. If not, don't call this retrieveAllReferences method, but I don't see how. Am I going about this all wrong? Does reference-descriptor not allow 1:0 relations? Any work around to my problem? Your suggestions are greatly appreciated!

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• What is the fastest way to unzip textfiles in Matlab during a function?

  - by Paul

  Hello all, I would like to scan text of textfiles in Matlab with the textscan function. Before I can open the textfile with fid = fopen('C:\path'), I need to unzip the files first. The files have the extension: *.gz There are thousands of files which I need to analyze and high performance is important. I have two ideas: (1) Use an external program an call it from the command line in Matlab (2) Use a Matlab 'zip'toolbox. I have heard of gunzip, but don't know about its performance. Does anyone knows a way to unzip these files as quick as possible from within Matlab? Thanks!

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• Eclipse or Netbeans for Swing based application?

  - by Nazgulled

  Hi, My next university project is going to be Java based. We will have to develop this with Swing and I was wondering what's the common preference for that? A quick glimpse through Netbeans website and I could see a powerful Swing editor, or what it looks like one; since I never used it, I don't know. As for Eclipse, I'm sure there are plugins for Swing, but are they any good? How do they compare to Netbeans? The bottom line is, should I go with Netbeans or Eclipse for a Swing based project?

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• Update {node_counter} table programatically in drupal

  - by wiifm69

  I currently use the statistics module (core) on my Drupal 6 install. This increments a count in the {node_counter} table every time the node is viewed, and this works. My question is - can I programmatically increment this counter as well? I am looking to achieve this when users interact with content created from views (say click a lightbox), so being able to update the table with AJAX would be ideal. I have done a quick search on d.o and there doesn't appear to be any modules that stick out straight away. Does anyone have any experience with this?

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• Using terminal vs KDE in linux?

  - by Ke

  Hi Im used to using nautilus within centos but have recently just got a VPS and quickly realising that using a KDE is unacceptable in this environment. Although I do find it so much quicker doing things like folder permissions in KDE rather than typing it all out in the terminal? Everyone I speak to says, use the terminal and I should learn this way as opposed to using the KDE, but theres certain things I just dont get How is it possible to make quick changes to scripts and viewing them in a browser etc , without a mouse or using KDE? and only using a terminal?? I am wondering how to develop websites just using the terminal??? How can it be quicker to type out/view permissions etc in the terminal when its instant and just a few clicks in the KDE? Any thoughts are much appreciated. I would love to understand the benefits but just cant seem to see them right now. Cheers Ke.

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• Which Python API should be used with Mongo DB and Django

  - by Thomas

  I have been going back and forth over which Python API to use when interacting with Mongo. I did a quick survey of the landscape and identified three leading candidates. PyMongo MongoEngine Ming If you were designing a new content-heavy website using the django framework, what API would you choose and why? MongoEngine looks like it was built specifically with Django in mind. PyMongo appears to be a thin wrapper around Mongo. It has a lot of power, though loses a lot of the abstractions gained through using django as a framework. Ming represents an interesting middle ground between PyMongo and MongoEngine, though I haven't had the opportunity to take it for a test drive.

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• How to round CGFloat

  - by Johannes Jensen

  I made this method + (CGFloat) round: (CGFloat)f { int a = f; CGFloat b = a; return b; } It works as expected but it only rounds down. And if it's a negative number it still rounds down. This was just a quick method I made, it isn't very important that it rounds correctly, I just made it to round the camera's x and y values for my game. Is this method okay? Is it fast? Or is there a better solution?

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• What is a good Java crawler library?

  - by DrDee

  Hi, I am about to develop a crawler in Java but don't feel like reinventing the wheel. A quick Google search gives a whole bunch of Java libraries to build a web crawler. Besides that Nutch is of course a very robust package but seems a bit too advanced for my needs. I only need to crawl a handful websites a week containing a couple of 1000 pages each. Which open source Java library would you recommend considering: speed multithreading (or even distributed) extending it with new functionality active maintained and documentation?

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• SQL Max Group By Query Help

  - by Hcabnettek

  Hi All, I have a quick question. How do I select the two values I need in one query? Currently I'm doing this, which works fine, but it's obviously running two queries when one should do the trick. I tried MAX(columnA) and GROUP BY ColumnB, but that returns multiple row. I only want one row returned. DECLARE @biID bigint , @dtThreshold DateTime SELECT @biID = MAX(biID) FROM tbPricingCalculationCount WITH (NOLOCK) SELECT @dtThreshold = dtDateTime FROM tbPricingCalculationCount WITH (NOLOCK) WHERE biID = @biID I would like both those variables to be set correctly in one query. How can I do that? Thanks, ~ck

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• Service broker with SqlNotificationRequest

  - by user171523

  I am in the process of evaluating a Service Broker with SQL noticiation for my project. My requirements is User places a order from System A and it will update Order Table. As soon as order is place i need to notify the System B. I have done a quick POC with Trigger , Service Broker and SQLNotificaiton ADO.NET. It is working as i expected. What i would like to know the group A) What are the best practices i need to follow for this? B) What are disadvantages with the above approach if any? C) Are there any disadvantes of using the Triggers? If so what are those for above approach? The order table will get order from System A like 1000 to 1500 every day. I also would like to know the performance of above approach.

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• Bouncycastle encryption algorithms not provided

  - by David Read

  I'm trying to use BouncyCastle with android to implement ECDH and EL Gamal. I've added the bouncycastle jar file (bcprov-jdk16-144.jar) and written some code that works with my computers jvm however when I try and port it to my android application it throws: java.security.NoSuchAlgorithmException: KeyPairGenerator ECDH implementation not found A sample of the code is: Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider()); java.security.KeyPairGenerator keyGen = org.bouncycastle.jce.provider.asymmetric.ec.KeyPairGenerator.getInstance("ECDH", "BC"); ECGenParameterSpec ecSpec = new ECGenParameterSpec("prime192v1"); keyGen.initialize(ecSpec, SecureRandom.getInstance("SHA1PRNG")); KeyPair pair = keyGen.generateKeyPair(); PublicKey pubk = pair.getPublic(); PrivateKey prik = pair.getPrivate(); I then wrote a simple program to see what encryption algorithms are available and ran it on my android emulator and on my computers jvm the code was: Set<Provider.Service> rar = new org.bouncycastle.jce.provider.BouncyCastleProvider().getServices(); Iterator<Provider.Service> ir = rar.iterator(); while(ir.hasNext()) System.out.println(ir.next().getAlgorithm()); On android I do not get any of the EC algorithms while ran normally on my computer it's fine. I'm also getting the following two errors when compiling for a lot of the bouncy castle classes: 01-07 17:17:42.548: INFO/dalvikvm(1054): DexOpt: not resolving ambiguous class 'Lorg/bouncycastle/asn1/ASN1Encodable;' 01-07 17:17:42.548: DEBUG/dalvikvm(1054): DexOpt: not verifying 'Lorg/bouncycastle/asn1/ess/OtherSigningCertificate;': multiple definitions What am I doing wrong?

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• PHP DateTime Regex

  - by CogitoErgoSum

  Hey, long story short I have inherited some terrible code. As a result a string comparison is buggy when comparing dates due to the format of the date. I am trying to convert the date to a valid DateFormat syntax so I can run a proper comparison. These are some samples of the current format: 12/01/10 at 8:00PM 12/31/10 at 12:00PM 12/10/09 at 5:00AM and so forth. I'd like to convert this to a YYYYMMDDHHMM format i.e 201012012000 for comparison purposes. If anyone can give me a quick regex snippet to do this that'd be appreciated as right now i'm hitting a brick wall for a regex. I can do it by exploding the string over several times etc but I'd rather do it in a more efficient manner. Thanks!

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• PGP Command Line Decryption --- How to decrypt file?

  - by whitman6732

  I was sent a public key in order to decrypt a pgp-encrypted file. I imported the key with: gpg --import publickey.asc And verified it with gpg --list-keys Now, I'm trying to decrypt the file. I put the passphrase in a file called pass.txt and ran this at the command line: gpg --passphrase-fd ../../pass.txt --decrypt encryptedfile.txt.pgp --output encryptedfile.txt All it says is: Reading passphrase from file descriptor 0 ... And doesn't seem to be doing anything else. I can't tell if it's hanging or not. Is it a relatively quick process? The file is large ( about 2 GB ). Is the syntax for it correct?

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• elisp compile, add a regexp to error detection

  - by Gauthier

  I am starting with emacs, and don't know much elisp. Nearly nothing, really. I want to use ack as a replacement of grep. These are the instructions I followed to use ack from within emacs: http://www.rooijan.za.net/?q=ack_el Now I don't like the output format that is used in this el file, I would like the output to be that of ack --group. So I changed: (read-string "Ack arguments: " "-i" nil "-i" nil) to: (read-string "Ack arguments: " "-i --group" nil "-i --group" nil) So far so good. But this made me lose the ability to click-press_enter on the rows of the output buffer. In the original behaviour, compile-mode was used to be able to jump to the selected line. I figured I should add a regexp to the ack-mode. The ack-mode is defined like this: (define-compilation-mode ack-mode "Ack" "Specialization of compilation-mode for use with ack." nil) and I want to add the regexp [0-9]+: to be detected as an error too, since it is what every row of the output bugger includes (line number). I've tried to modify the define-compilation-modeabove to add the regexp, but I failed miserably. How can I make the output buffer of ack let me click on its rows? --- EDIT, I tried also: --- (defvar ack-regexp-alist '(("[0-9]+:" 2 3)) "Alist that specifies how to match rows in ack output.") (setq compilation-error-regexp-alist (append compilation-error-regexp-alist ack-regexp-alist)) I stole that somewhere and tried to adapt to my needs. No luck.

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• FullCalendar: Change agendaDay background-color..

  - by Nick-ACNB

  While I have seen this question asked, I haven't seen the answer. Basically, I just want to be able to color the background-color of the TD from a certain range.. Say I have my calendar that has slot minutes every 15 minutes and from 9am to 9pm, I would like to only color differently 10am to 3pm. This information would be coming from a feed but that is not an issue. I haven't found the TDs relating to a set time inside the calendar. Perhaps I missed something? :) I am rather new to jQuery and fullCalendar. Also, another quick question that is unrelated to the main one: is it possible from an event handler to get the id of the calendar that launched it? I have multiple calendars on my page to simulate something like a Gantt view. This will let me be able to fetch the right feed and populate the right events. Thank you for your time.

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• Should my connected web parts support IWebPartField, IWebPartRow and IWebPartData?

  - by Javaman59

  I've been writing some simple webparts, and they communicate via a custom interface type. That's working fine. I've got one ConnectionProvider, with a variety of ConnectionConsumers. I see that the OOTB SharePoint webparts provide many standard connections, apparently through IWebPartField and IWebPartRow (IWebPartData seems less supported). I've tried to add a IWebPartRow interface to a provider, and found that it's not actually useful (apparently), unless it's shareing data that the OOTB components use, such as images, urls and users. Well, that's the impression I got, anyway... I've only done a quick experiment, and found it quite difficult to implement and test. Is there any point in spending time trying to add support for the standard webpart interfaces?

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• PHP OOP Concepts (Value Objects / Data Access Objects)

  - by Iuhiz

  Hi, I've just started to learn PHP OOP, previously I have been doing PHP in a procedural manner. I was reading this article and I've got a couple of quick questions, How is the constructor for value objects commonly defined? As one that takes in all "data members" as parameters or stick to the default constructor and use mutator / accessor methods to set / get data members? Is this actually the recommended way to start doing PHP OOP? Cos honestly, the concepts explained in the article was a tad confusing for me. Cheers

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• In what case does IE8 block Javascript and how to avoid it ?

  - by e-satis

  I got a web site using jQuery, jQuery Tools and some handcrafted JS running performing graphical enhancements. While it's running smooth on FF, Safari and Chrome, IE blocks the script execution : There is nothing particularly more dangerous on this code than, let's say, on Netvibes. Why is even talking about activeX ? I'm using JS. And how can I prevent that ? I don't want my user to click on "I allow this website" to work. It would be like putting a big red absolute DIV reading "Live quick and never come back".

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