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  • Lack of IsNumeric function in C#

    - by Michael Kniskern
    One thing that has bothered me about C# since its release was the lack of a generic IsNumeric function. I know it is difficult to generate a one-stop solution to detrmine if a value is numeric. I have used the following solution in the past, but it is not the best practice because I am generating an exception to determine if the value is IsNumeric: public bool IsNumeric(string input) { try { int.Parse(input); return true; } catch { return false; } } Is this still the best way to approach this problem or is there a more efficient way to determine if a value is numeric in C#?

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  • cached schwartzian transform

    - by davidk01
    I'm going through "Intermediate Perl" and it's pretty cool. I just finished the section on "The Schwartzian Transform" and after it sunk in I started to wonder why the transform doesn't use a cache. In lists that have several repeated values the transform recomputes the value for each one so I thought why not use a hash to cache results. Here' some code: # a place to keep our results my %cache; # the transformation we are interested in sub foo { # expensive operations } # some data my @unsorted_list = ....; # sorting with the help of the cache my @sorted_list = sort { ($cache{$a} or $cache{$a} = &foo($a)) <=> ($cache{$b} or $cache{$b} = &foo($b)) } @unsorted_list; Am I missing something? Why isn't the cached version of the Schwartzian transform listed in books and in general just better circulated because on first glance I think the cached version should be more efficient?

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  • Using Python's ConfigParser to read a file without section name

    - by Arrieta
    Hello: I am using ConfigParser to read the runtime configuration of a script. I would like to have the flexibility of not providing a section name (there are scripts which are simple enough; they don't need a 'section'). ConfigParser will throw the NoSectionError exception, and will not accept the file. How can I make ConfigParser simply retrieve the (key, value) tuples of a config file without section names? For instance: key1=val1 key2:val2 I would rather not write to the config file.

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  • Smoothing Small Data Set With Second Order Quadratic Curve

    - by Rev316
    I'm doing some specific signal analysis, and I am in need of a method that would smooth out a given bell-shaped distribution curve. A running average approach isn't producing the results I desire. I want to keep the min/max, and general shape of my fitted curve intact, but resolve the inconsistencies in sampling. In short: if given a set of data that models a simple quadratic curve, what statistical smoothing method would you recommend? If possible, please reference an implementation, library, or framework. Thanks SO!

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  • Hibernate -using Table per subclass - how to link an existing superclass object to a sibclass object

    - by Chandni
    Hi, I have a User hibernate class, Clerk class and Consumer class. All these maps to their own tables in database. The User PK also acts as Clerk's and Consumer's PK. So now my problem is that if a user is initially a Clerk, he has a record in Users table and Clerks table. If that user wants to become a consumer, I want to link that User's record to the new Consumer's record. So even if I pass the userId to the consumer's record, it treats it as a new User to be persisted and gives a duplicate_key exception. How do I tell Hiernate to link the same user object with this new Consumer object. Thanks in advance, -Chandni

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  • C# Threads.Abort()

    - by Betamoo
    If a thread is running a function func1 that calls another function func2 inside it... Then I called thread.Abort() Will this stop func1 only OR func1 and func2 and all the functions func1 has called?? Thanks Edit: Here are more detail: func1 is called in a new thread, it continuously calls func2 on regular basis... func2 begin doing some work only if some array is not null.. it finishes it and return When supervisor wants to save data, it aborts Thread of func1- and then makes array null, saves data, then fill in the array with new one.. and starts Thread with func1 again.. Sometimes exception is raised because array is null in func2.. so func1 abort did not affect func2

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  • Find a missing 32bit integer among a unsorted array containing at most 4 billion ints

    - by pierr
    Hi, This is the problem described in Programming pearls. I can not understand binary search method descrbied by the author. Can any one helps to elaborate? Thanks. EDIT: I can understand binary search in general. I just can not understand how to apply binary search in this special case. How to decide the missing number is in or not in some range so that we can choose another. English is not my native language, that is one reason I can not understand the author well. So, use plain english please:) EDIT: Thank you all for your great answer and comments ! The most important lesson I leant from solving this question is Binary search applies not only on sorted array!

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  • SQL Server 2008 Table Maintenance - Rebuild, Reorganize, Update Stats, Check Integrity etc HELP!

    - by Albert
    I'm migrating a ~15GB database from SQL Server 2005 to a new server running SQL Server 2008, and along with that I need to create all the new Maintenance Plans. I can take care of all the backup stuff, but the table maintenance baffles me some. Does anyone have any input on how often I should (or how often you do would suffice too) the following tasks? Check Database Integrity Rebuild Indexes Reorganize Indexes Update Statistics Shrink Database? Am I missing anything? Again if you can share how often you do these tasks that would be great...and/or share any general information about your approach to table maintenance that would be helpful. Lastly does it matter what order I run these tasks in (when setting up a job)?

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  • Is there a DRMAA Java library that works with Torque/PBS?

    - by dondondon
    Does anybody know a Java implementation of the DRMAA-API that is known to work with PBS/Torque cluster software? The background behind this: I would like to submit jobs to a newly set-up linux cluster from java using a DRMAA compliant API. The cluster is managed by PBS/Torque. Torque includes PBS DRMAA 1.0 library for Torque/PBS that contains a DRMA-C binding and provides in libdrmaa.so and .a binaries. I know that Sun grid engine includes a drmaa.jar providing a Java-DRMAA API. In fact I opted to use SGE but it was decided to try PBS first. The theory behind that decision was: 'DRMAA is a standard and therefore a Java API needs only a standards compliant drmaa-c binding.' However, I couldn't find such 'general DRMAA-C-java API' and now assume that this assumption is wrong and that the Java libraries are engine specific. Are we stuck here? Any comments appreciated.

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  • Is there any way to limit the size of an STL Map?

    - by Nathan Fellman
    I want to implement some sort of lookup table in C++ that will act as a cache. It is meant to emulate a piece of hardware I'm simulating. The keys are non-integer, so I'm guessing a hash is in order. I have no intention of inventing the wheel so I intend to use stl::map for this (though suggestions for alternatives are welcome). The question is, is there any way to limit the size of the hash to emulate the fact that my hardware is of finite size? I'd expect the hash's insert method to return an error message or throw an exception if the limit is reached. If there is no such way, I'll simply check its size before trying to insert, but that seems like an inelegant way to do it.

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  • What is the most efficient way to find missing semicolons in VS with C++?

    - by Dr. Monkey
    What are the best strategies for finding that missing semicolon that's causing the error? Are there automated tools that might help. I'm currently using Visual Studio 2008, but general strategies for any environment would be interesting and more broadly useful. Background: Presently I have a particularly elusive missing semicolon (or brace) in a C++ program that is causing a C2143 error. My header file dependencies are fairly straightforward, but still I can't seem to find the problem. Rather than post my code and play Where's Wally (or Waldo, depending on where you're from) I thought it would be more useful to get some good strategies that can be applied in this and similar situations. As a side-question: the C2143 error is showing up in the first line of the first method declaration (i.e. the method's return type) in a .cpp file that includes only its associated .h file. Would anything other than semicolons or braces lead to this behaviour?

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  • Refreshing a binding that uses a value converter

    - by Hadi Eskandari
    I have a WPF UI that is bound to an object. I'm using a ValueConverter to convert a property to a specific image by a business rule: public class ProposalStateImageConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { var proposal = value as Proposal; var basePath = "pack://application:,,,/ePub.Content;component/Images/General/Flag_{0}.png"; string imagePath; if(proposal.Invoice != null) { imagePath = string.Format(basePath, "Good"); } else { imagePath = string.Format(basePath, "Warning"); } var uri = new Uri(imagePath); var src = uri.GetImageSource(); //Extention method return src; } } It is working fine, but later, when the object's state changes, I want to refresh the image and make the value converter reevaluate. How is this possible?

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  • Ampersand in link description text?

    - by kitenski
    I am validating my site using validator.w3.org and have an issue where there is a & in my link description text. ie this is taken from the source <a class='tag' href='/php/iphone software.php?function=developer&amp;dev=witch%26wizards+inc.&amp;store=143441'>witch&wizards inc.</a> Which gives me this error in the validator Line 188, Column 540: cannot generate system identifier for general entity "wizards" …6wizards+inc.&store=143441'witch&wizards inc. If I urlencode the description then the validation passes, but the user then sees the text displayed urlencoded, ie Developer witch%26wizards+inc. However I believe it's much more user friendly if this was displayed unencoded, ie Developer witch&wizards inc. Is there a way to pass validation but still have user friendly text displayed? Thanks, Greg

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  • Zend_Soap_Client doesn't work with proxy

    - by understack
    I'm accessing a SOAP web service like : $wsdl_url = 'http://abslive3.timesgroup.com:8888/clsRSchedule.soap?wsdl' ; $client = new Zend_Soap_Client($wsdl_url, array('proxy_host'=>"http://virtual-browser.25u.com" , 'proxy_port'=>80)); Since my shared server blocks port 8888, I'm using this proxy server. But Zend Soap Client tries to directly connect it. Exception information: Message: SOAP-ERROR: Parsing WSDL: Couldn't load from 'http://abslive3.timesgroup.com:8888/clsRSchedule.soap?wsdl' : failed to load external entity "http://abslive3.timesgroup.com:8888/clsRSchedule.soap?wsdl" Stack trace: #0 /home/..../library/Zend/Soap/Client/Common.php(51): SoapClient->SoapClient('http://abslive3...', Array) #1 /home/..../library/Zend/Soap/Client.php(1024): Zend_Soap_Client_Common->__construct(Array, 'http://abslive3...', Array) #2 /home/..../library/Zend/Soap/Client.php(1180): Zend_Soap_Client->_initSoapClientObject() #3 /home/..../library/Zend/Soap/Client.php(1104): Zend_Soap_Client->getSoapClient() #4 [internal function]: Zend_Soap_Client->__call('ReturnDataSet', Array) What am I doing wrong?

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  • Quicksort causes stackoverflow...

    - by Tony
    I have the following code, (taken from here), but it causes a stackoverflow exception when there's two the same value's in the list to sort. Can someone help me what's causing this? public static IEnumerable<int> QSLinq(IEnumerable<int> _items) { if (_items.Count() <= 1) return _items; var _pivot = _items.First(); var _less = from _item in _items where _item < _pivot select _item; var _same = from _item in _items where _item == _pivot select _item; var _greater = from _item in _items where _item > _pivot select _item; return QSLinq(_less).Concat(QSLinq(_same)).Concat(QSLinq(_greater)); }

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  • Problem of reading OWL/XML

    - by Mikae Combarado
    Hello, I have a problem reading OWL/XML files from Java using Jena. I have no problem reading RDF/XML files, but whenever I create a OWL/XML file from Protege and try to read it, Java gives this error below : WARN [main] (RDFDefaultErrorHandler.java:36) Exception in thread "main" java.lang.NullPointerException at com.hp.hpl.jena.rdf.arp.impl.XMLHandler.endElement(XMLHandler.java:143) The code that I use to retrieve RDF/XML is below : OntModel ontModel = ModelFactory.createOntologyModel(); InputStream in = FileManager.get().open(inputFileName); if (in == null) { throw new IllegalArgumentException( "File: " + inputFileName + " not found"); } ontModel.read(in, ""); This code works with RDF/XML perfectly. However, I cannot read an OWL/XML. I looked at Internet and I couldn't find anything. I would really appreciate, if someone shows me a way. Many thanks

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  • Developing Silverlight 1.0 Applications on VS2008 SP1

    - by Moo
    Hi, Can anyone point me to any guides, howto's or general documentation on how to develop Silverlight 1.0 (it has to be 1.0) on VS2008 SP1. I have searched high and low for information, and it all seems to be out of date (referencing Silverlight 1.0 Tools for Visual Studio 2008 beta, release candidate and alpha packages) or just plain doesn't work under VS2008 SP1. What do I need to install, and which project do I need to create? I have installed the Silverlight 1.0 SDK, which gave me no starting point, the Silverlight 2.0 Tools for Visual Studio after a website suggested you could use that to develop 1.0 apps, but the suggested template doesn't exist, and Silverlight 3.0 Tools for Visual Studio, which was a last ditch resort. Regards Moo

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  • Compact Framework : Read a SQL CE database on a PDA from a PC

    - by CF_Maintainer
    Hello, I have tasked with upgrading a CF Framework 1.1 suite of apps. Currently, the PC starts a server [after confirming via RAPI that the device exists and is connected] and spawns a app on the PDA as the client. The client process on the PDA talks with the db on the PDA and returns records to the PC app [using SQL CE 2.0. OpenNETCF 1.4 for communication/io]. I have a chance to upgrade the PC and PDA suite of apps to Framework 3.5 & CF 3.5 respectively. Due to a business requirement, I cannot get rid of workflow requiring the PC app to show a preview of the work done on the PDA. Question : Are there better ways to achieve the above in general with the constraints I have? I would really appreciate any Ideas/advice.

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  • Nullables? Detecting them

    - by Aren B
    Ok, im still a bit new to using nullable types. I'm writing a reflecting object walker for a project of mine, im getting to the point where im setting the value of a reflected property with the value i've retrieved from a reflected property. The value i've retrieved is still in object form, and it dawned on me, since i want my object walker to return null when it can't find something, (I thought about throwing an exception, but i want this to soft-fail when something's wrong). Anyway, some of the values im setting/getting are decimal bool etc... so it dawned on me that i should just NOT set a non-nullable value, but I realized I straight up don't know how to tell decimal from decimal? Is it enough to key on if the Type of the property im setting is inherited from ValueType?

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  • Problem with CommandFinder class...

    - by Patrick
    and I'm not sure why... Hello Everbody! I'm trying to make my first steps with SWTBot. I'm trying to test an Eclipse RCP Application. In one test i'm trying to call a command to save a dirty editor. But an assertion after the call, tells me that the editor is still dirty. An the data in the dirty editor is not showing up in the database. On the other hand, i'm not getting an Exception when calling the command... new CommandFinder().findCommand(CoreMatchers.equalTo(COMMANDNAME_SAVE)).get(0).click(); Has anyone any insperation for me, where i made a mistake?

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  • File.mkdir is not working and I can't understand why

    - by gotch4
    Hello, I've this brief snippet: String target = baseFolder.toString() + entryName; target = target.substring(0, target.length() - 1); File targetdir = new File(target); if (!targetdir.mkdirs()) { throw new Exception("Errore nell'estrazione del file zip"); } doesn't mattere if I leave the last char (that is usually a slash). It's done this way to work on both unix and windows. The path is actually obtained from the URI of the base folder. As you can see from baseFolder.toString() (baseFolder is of type URI and is correct). The base folder actually exists. I can't debug this because all I get is true or false from mkdir, no other explanations.The weird thing is that baseFolder is created as well with mkdir and in that case it works. Now I'm under windows. the value of target just before the creation of targetdir is "file:/C:/Users/dario/jCommesse/jCommesseDB" if I cut and paste it (without the last entry) in windows explore it works...

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  • Variable alpha blending in pylab

    - by Hooked
    How does one control the transparency over a 2D image in pylab? I'd like to give two sets of values (X,Y,Z,T) where X,Y are arrays of positions, Z is the color value, and T is the transparency to a function like imshow but it seems that the function only takes alpha as a scalar. As a concrete example, consider the code below that attempts to display two Gaussians. The closer the value is to zero, the more transparent I'd like the plot to be. from pylab import * side = linspace(-1,1,100) X,Y = meshgrid(side,side) extent = (-1,1,-1,1) Z1 = exp(-((X+.5)**2+Y**2)) Z2 = exp(-((X-.5)**2+(Y+.2)**2)) imshow(Z1, cmap=cm.hsv, alpha=.6, extent=extent) imshow(Z2, cmap=cm.hsv, alpha=.6, extent=extent) show() Note: I am not looking for a plot of Z1+Z2 (that would be trivial) but for a general way to specify the alpha blending across an image.

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  • Creating SQL Server index on a nvarchar column

    - by Jahan
    When I run this SQL statement: CREATE UNIQUE INDEX WordsIndex ON Words (Word ASC); I get the following exception message: The CREATE UNIQUE INDEX statement terminated because a duplicate key was found for the object name 'dbo.Words' and the index name 'WordsIndex'. The duplicate key value is (ass). The statement has been terminated. The 'Word' column has a datatype of nvarchar(100). There are two items in the 'Word' column that SQL Server interprets as the same: 'aß' and 'ass', which causes the indexing failure. Why would SQL Server interpret those two different words as the same word?

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  • circuit/block-diagram drawing

    - by JCLL
    I'm looking for either algorithms or visualization tool for (nice) circuit/block-diagram drawing. I am also interested in a general formulation of the problem. By "circuit drawing", I mean the capability of exploring place & route for block-diagrams (rectangles) with I/O ports and their connections (wires). These block-diagrams can be hierarchical i.e some blocks may have some nested internal sub-structure etc. This topic is strongly related to classical graph-drawing, with the supplemental constraint of the need to take ports location into account, and possibly the shape of the blocks (rectangle of various sizes). Graphviz tools do not respond to the problem (at least my previous experiments have not been satisfactory). Force-directed algorithms retain my attention, but I have just found papers on classical directed graphs. Any hints ?

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  • Which .NET class does represent the main CONTROLLER class for WebForms ?

    - by Renato Gama
    Hey guys, lately I was studying a bit of Java, when I was taught about a way to implement a controller class, whose resposibility is to redirect the request to an Action, which perfoms a specified work. That was the way I learnt; @Override protected void service(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { try { String clazz = req.getRequestURI().replaceAll(req.getContextPath() + "/", "").replaceAll(".java", ""); ((Action)Class.forName("com.myProject.actions." + clazz).newInstance()).execute(req, res); } catch (Exception e) { e.printStackTrace(); } } I know that WebForms also works with HANDLERS, which are kind of actions. For example, each .aspx page inherits from a Page object which is a handler for that specified page. What I couldn't figure out is, which class does get request first and translate it to the specified action (page handler)? Is it a WebForms feature(implementation) or its a IIS resposibility? So, which class represent the main controller for WebForms? Thank you very much.

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