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  • Container fix width. Center div dynamic width. want left right divs to fill out remaining width equally

    - by james
    Have Three columns..Combine width of all three is fixed.. 2nd ( center ) column will have dynamic content.. I need left and right column to fill out remaining space ( container width - center column dynamic width )equally. Example: http://jsfiddle.net/htKje/ <div class="container"> <div class="bg"></div> <div>Lorem Ipsum</div> <div class="bg"></div> </div> CSS : .container { width:500px; } .bg {backgrould:#CCC; }

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  • How to solve JavaScript origin problem with an application and static file server

    - by recipriversexclusion
    In a system that I'm building I want to serve Static files (static HTML pages and a lot of images), and Dynamic XML generated by my servlet. The dynamic XML is generated from my database (through Hibernate) and I use Restlets to serve it in response to API calls. I want to create a static file server (e.g. Apache) so that this does not interfere with the dynamic server traffic. Currently both servers need to run on the same machine. I've never done something like this before and this is where I'm stuck: The static HTML pages contain JavaScript that makes API calls to the dynamic server. However, since the two servers operate on different ports, I get stuck with the same origin problem. How can this be solved? As a bonus, if you can point me to any resources that explain how to create such a static/dynamic content serving system, I'll be happy. Thanks!

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  • Creating a dynamic lacp trunk from HP Procurve 2412zl to Proliant DL380 G7

    - by Maalobs
    I'm configuring an IEEE 802.3ad (LACP) dynamic trunk from a HP Procurve 2412zl (firmware version K.15.07) switch to a HP Proliant DL380 G7 server. The DL380 has 4 NICs and is running Win2008 R2, so I'm teaming the NICs together and leaving everything on the recommended "automatic" setting in the HP NIC configuration tool. The server is one of two, they'll be connected on interfaces F17-F20 and F21-F24 respectively on the switch. I need the servers in a separate VLAN, here is the configuration for the VLAN: vlan 10 name "Lab_Mgmt" untagged B2,F17-F24 ip address 172.22.71.3 255.255.255.0 tagged B21 exit There is a DHCP-relay into the VLAN 10 from another device beyond interface B21. The Advanced Traffic Management Guide says that in order to run a dynamic LACP trunk on another VLAN besides the DEFAULT_VLAN, you need to first enable GVRP and then use "forbid" to stop the interfaces from automatically joining DEFAULT_VLAN when the dynamic trunk is created. GVRP brings some other stuff with it that I don't want or need, so I disable it with "unknown-vlans disable" on all other interfaces. Here is how I do it: procurve-5412zl-1(config)# gvrp procurve-5412zl-1(config)# interface A1-A24,B1-B24,C1-C24,D1-D10,D13-D24,E1-E24, F1-F16,K1,K2 unknown-vlans disable procurve-5412zl-1(config)# vlan 1 forbid F17-F24 procurve-5412zl-1(config)# interface F17-F20 lacp active The result afterwards looks all successful: procurve-5412zl-1(config)# show trunks Load Balancing Method: L3-based (Default), L2-based if non-IP traffic Port | Name Type | Group Type ---- + -------------------------------- --------- + ------ -------- F17 | XYZTEAM3_NIC1 100/1000T | Dyn2 LACP F18 | XYZTEAM3_NIC2 100/1000T | Dyn2 LACP F19 | XYZTEAM3_NIC3 100/1000T | Dyn2 LACP F20 | XYZTEAM3_NIC4 100/1000T | Dyn2 LACP procurve-5412zl-1(config)# vlan 10 procurve-5412zl-1(vlan-10)# show lacp LACP LACP Trunk Port LACP Admin Oper Port Enabled Group Status Partner Status Key Key ---- ------- ------- ------- ------- ------- ------ ------ F17 Active Dyn2 Up Yes Success 0 0 F18 Active Dyn2 Up Yes Success 0 0 F19 Active Dyn2 Up Yes Success 0 0 F20 Active Dyn2 Up Yes Success 0 0 On the Proliant server, the NIC configuration Tool is also indicating that a 802.3ad dynamic trunk has been established. Everything should be good, but it isn't. The server is not getting an IP-address from the DHCP, which it does if I'm not enabling LACP. If I configure the server to a static IP-address on the VLAN 10 subnet, it can't even ping the switch IP-address, much less anything outside of the VLAN. The switch can't ping the server either. I did another attempt with F17-F20 tagged, and checking the box "Default Native Tag (VLAN 10)" in the NIC configuration tool on the server, but there was no difference. Does anyone have any idea what I might have missed?

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  • Apache mod_proxy dynamic filter

    - by jrhicks
    How can I configure Apache to ProxyBlock content based on something dynamic such as time-of-day or max-use. Basicly I'm curious about the scriptability of Apache. My web-stumbling leads me to believe I can combine mod-proxy and mod-perl in interesting ways to do dynamic filtering. But I'm pretty lost. What are some general instructions, tutorials, books, technologies to begin scripting Apache (or any suitable proxy).

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  • NSString variable out of scope in sub-class (iPhone/Obj-C)

    - by Rich
    I am following along with an example in a book with the code exactly as it is in the example code as well as from the book, and I'm getting an error at runtime. I'll try to describe the life cycle of this variable as good as I can. I have a controller class with a nested array that is populated with string literals (NSArray of NSArrays, the nested NSArrays initialized with arrayWithObjects: where the objects are all string literals - @"some string"). I access these strings with a helper method added via a category on NSArray (to pull strings out of a nested array). My controller gets a reference to this string and assigns it to a NSString property on a child controller using dot notation. The code looks like this (nestedObjectAtIndexPath is my helper method): NSString *rowKey = [rowKeys nestedObjectAtIndexPath:indexPath]; controller.keypath = rowKey; keypath is a synthesized nonatomic, retain property defined in a based class. When I hit a breakpoint in the controller at the above code, the NSString's value is as expected. When I hit the next breakpoint inside the child controller, the object id of the keypath property is the same as before, but instead of showing me the value of the NSString, XCode says that the variable is "out of scope" which is also the error I see in the console. This also happens in another sub-class of the same parent. I tried googling, and I saw slightly similar cases where people were suggesting this had to do with retain counts. I was under the impression that by using dot notation on a synthesized property, my class would be using an "auto generated accessor" that would be increasing my retain count for me so that I wouldn't have this problem. Could there be any implications because I'm accessing it in a sub-class and the prop is defined in the parent? I don't see anything in the book's errata about this, but the book is relatively new (Apress - More iPhone 3 Dev). I also have double checked that my code matches the example 100 times.

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  • InvalidOperationException (Lambda parameter not in scope) when trying to Compile a Lambda Expression

    - by Moshe Levi
    Hello, I'm writing an Expression Parser to make my API more refactor friendly and less error prone. basicaly, I want the user to write code like that: repository.Get(entity => entity.Id == 10); instead of: repository.Get<Entity>("Id", 10); Extracting the member name from the left side of the binary expression was straight forward. The problems began when I tried to extract the value from the right side of the expression. The above snippet demonstrates the simplest possible case which involves a constant value but it can be much more complex involving closures and what not. After playing with that for some time I gave up on trying to cover all the possible cases myself and decided to use the framework to do all the heavy lifting for me by compiling and executing the right side of the expression. the relevant part of the code looks like that: public static KeyValuePair<string, object> Parse<T>(Expression<Func<T, bool>> expression) { var binaryExpression = (BinaryExpression)expression.Body; string memberName = ParseMemberName(binaryExpression.Left); object value = ParseValue(binaryExpression.Right); return new KeyValuePair<string, object>(memberName, value); } private static object ParseValue(Expression expression) { Expression conversionExpression = Expression.Convert(expression, typeof(object)); var lambdaExpression = Expression.Lambda<Func<object>>(conversionExpression); Func<object> accessor = lambdaExpression.Compile(); return accessor(); } Now, I get an InvalidOperationException (Lambda parameter not in scope) in the Compile line. when I googled for the solution I came up with similar questions that involved building an expression by hand and not supplying all the pieces, or trying to rely on parameters having the same name and not the same reference. I don't think that this is the case here because I'm reusing the given expression. I would appreciate if someone will give me some pointers on this. Thank you.

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  • Object not declared in scope

    - by jay
    I'm using Xcode for C++ on my computer while using Visual Studio at school. The following code worked just fine in Visual Studio, but I'm having this problem when using Xcode. clock c1(2, 3, 30); Everything works just fine, but it keeps giving me this error that says "Expected ';' before 'c1'" Fine, I put the ';' .. but then, it gives me this error: "'c1' was not declared in this scope" Here's the whole header code: #include <iostream> using namespace std; class clock { private: int h; int m; int s; public: clock(int hr, int mn, int sec); }; clock::clock(int hr, int mn, int sec) { h = hr; m = mn; s = sec; } Here's the whole .cpp code: #include "clock.h" int main() { clock c1(2, 3, 30); return 0; } I stripped everything down to where I had the problem. Everything else, as far as I know, is irrelevant since the problem remains the same with just the mentioned above. Thanks in advance!

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  • javascript setTimeout function out of scope.

    - by Keyo
    I am trying to call showUpload(); from within two setTimeouts. Neither works. It seems to be out of scope and I'm not sure why. I tried this.showUpload() which didn't work either. $(document).ready(function(){ var progress_key = $('#progress_key').val(); // this sets up the progress bar $('#uploadform').submit(function() { setTimeout("showUpload()",1500); $("#progressbar").progressbar({ value:0}).fadeIn(); }); // uses ajax to poll the uploadprogress.php page with the id // deserializes the json string, and computes the percentage (integer) // update the jQuery progress bar // sets a timer for the next poll in 750ms function showUpload() { $.get("/myid/videos/uploadprogress/" + progress_key, function(data) { if (!data) return; var response; eval ("response = " + data); if (!response) return; var percentage = Math.floor(100 * parseInt(response['bytes_uploaded']) / parseInt(response['bytes_total'])); $("#progressbar").progressbar({ value:percentage}) }); setTimeout("showUpload()", 750); } }); Thank you for your time.

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  • Stuck on Object scope in Java

    - by ivor
    Hello, I'm working my way through an exercise to understand Java, and basically I need to merge the functionality of two classes into one app. I'm stuck on one area though - the referencing of objects across classes. What I have done is set up a gui in one class (test1), and this has a textfield in ie. chatLine = new JTextField(); in another class(test2), I was planning on leaving all the functionality in there and referencing the various gui elements set up in test1 - like this test1.chatLine I understand this level of referencing, I tested this by setting up a test method in the test2 class public static void testpass() { test1.testfield.setText("hello"); } I'm trying to understand how to implement the more complex functionality in test2 class though, specifically this existing code; test1.chatLine.addActionListener(new ActionAdapter() { public void actionPerformed(ActionEvent e) { String s = Game.chatLine.getText(); if (!s.equals("")) { appendToChatBox("OUTGOING: " + s + "\n"); Game.chatLine.selectAll(); // Send the string sendString(s); } } }); This is the bit I'm stuck on, if I should be able to do this - as it's failing on the compile, can I add the actionadapter stuff to the gui element thats sat in test1, but do this from test2 - I'm wondering if I'm trying to do something that's not possible. Hope this makes sense, I'm pretty confused over this - I'm trying to understand how the scope and referencing works. Ideally what i'm trying to achieve is one class that has all the main stuff in, the gui etc, then all the related functionality in the other class, and target the first class's gui elements with the results etc. Any thoughts greatly appreciated.

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  • AS3 variables handling by AVM/compiler/scope

    - by jchmielewski
    I have couple of questions about AS3 variables handling by AVM/compiler/scope .1. This code in Flash will throw an error: function myFunction() { var mc:MovieClip=new MovieClip(); var mc:MovieClip=new MovieClip(); } but it won`t throw an error in Flex (only warning in Editor). Why? .2. How Flash sees variables in loops? Apparently this: for (var i:int=0; i<2; i++) { var mc:MovieClip=new MovieClip(); } isn`t equal to just: var mc:MovieClip=new MovieClip(); var mc:MovieClip=new MovieClip(); because it will throw an error again as earlier in Flash, but in Flex in function not? Is Flash changing somehow my loop before compilation? .3. Where in a class in equivalent to timeline in Flash - where in class I would put code which I put normally on timeline (I assume it is not constructor because of what I have written earlier, or maybe it`s a matter of Flash/Flex compiler)?

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  • MS Access (Jet) transactions, workspaces & scope

    - by Eric G
    I am having trouble with committing a transaction (using Access 2003 DAO). It's acting as if I never had called BeginTrans -- I get error 3034 on CommitTrans, "You tried to commit or rollback a transaction without first beginning a transaction"; and the changes are written to the database (presumably because they were never wrapped in a transaction). However, BeginTrans is run, if you step through it. I am running it within the Access environment using the DBEngine(0) workspace. The tables I'm updating are all opened via a Jet database connection (to the same database) and updated using DAO.Recordset.update. The connection is opened before starting BeforeTrans. I'm not doing anything weird in the middle of the transaction like closing/opening connections or multiple workspaces etc. There is one nested transaction level (basically it's wrapping multiple transacted updates in an outer transaction, so if any fail they all fail). The inner transactions run without errors, it's the outer transaction that doesn't work. Here are a few things I've looked into and ruled out: The transaction is spread across several methods and BeginTrans and CommitTrans (and Rollback) are all in different places. But when I tried a simple test of running a transaction this way, it doesn't seem like this should matter. I thought maybe the database connection gets closed when it goes out of local scope, even though I have another 'global' reference to it (I'm never sure what DAO does with dbase connections to be honest). But this seems not to be the case -- right before the commit, the connection and its recordsets are alive (I can check their properties, EOF = False, etc.) My CommitTrans and Rollback are done within event callbacks. (Very basically, a parser program is throwing an 'onLoad' or 'onLoadFail' event at the end of parsing, which I am handling by either committing or rolling back the inserts I made during processing.) However, again, trying a simple test, it doesn't seem like this should matter. Any ideas why this isn't working for me? Thanks.

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  • php class scope when calling a non-method function not accessing all class members

    - by Aglystas
    So I'm using a stand alone function from within a class that that uses the class it's being called from. Here's the function function catalogProductLink($product_id,$product_name,$categories=true) { //This is the class that the function is called from global $STATE; if ($categories) { //The $STATE->category_id is the property I want to access, which I can't if (is_array($STATE->category_id)) { foreach($STATE->category_id as $cat_id) { if ($cat_id == 0) continue; $str .= "c$cat_id/"; } } } $str .= catalogUrlKeywords($product_name).'-p'.$product_id.'.html'; return $str; } And here's the function call, which is being made from within the $STATE class. $redirect = catalogProductLink($this->product_id, $tempProd->product_name, true, false); The object that I need access to is the $STATE object that has been declared global. Prior to this function call there are lots of public properties populated, but when I look at the $STATE object within the function scope it loses all the properties but one, product_id. The property that matters for this function is the category_id property, which is an array of category id's. I'm wondering why I don't have access to all the public properties of the $STATE object and how I can get access to them.

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  • Java reading xml element without prefix but within the scope of a namespace

    - by wsxedc
    Functionally, the two blocks should be the same <soapenv:Body> <ns1:login xmlns:ns1="urn:soap.sof.com"> <userInfo> <username>superuser</username> <password>qapass</password> </userInfo> </ns1:login> </soapenv:Body> ----------------------- <soapenv:Body> <ns1:login xmlns:ns1="urn:soap.sof.com"> <ns1:userInfo> <ns1:username>superuser</ns1:username> <ns1:password>qapass</ns1:password> </ns1:userInfo> </ns1:login> </soapenv:Body> However, how when I read using AXIS2 and I have tested it with java6 as well, I am having a problem. MessageFactory factory = MessageFactory.newInstance(); SOAPMessage soapMsg = factory.createMessage(new MimeHeaders(), SimpleTest.class.getResourceAsStream("LoginSoap.xml")); SOAPBody body = soapMsg.getSOAPBody(); NodeList nodeList = body.getElementsByTagNameNS("urn:soap.sof.com", "login"); System.out.println("Try to get login element" + nodeList.getLength()); // I can get the login element Node item = nodeList.item(0); NodeList elementsByTagNameNS = ((Element)item).getElementsByTagNameNS("urn:soap.sof.com", "username"); System.out.println("try to get username element " + elementsByTagNameNS.getLength()); So if I replace the 2nd getElementsByTagNameNS with ((Element)item).getElementsByTagName("username");, I am able to get the username element. Doesn't username have ns1 namespace even though it doesn't have the prefix? Am I suppose to keep track of the namespace scope to read an element? Wouldn't it became nasty if my xml elements are many level deep? Is there a workaround where I can read the element in ns1 namespace without knowing whether a prefix is defined?

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  • Passing the form scope to a Remote cfc

    - by cf_PhillipSenn
    What is the syntax for passing the form scope into a cfc with access="remote"? I have: <cfcomponent> <cfset Variables.Datasource = "xxx"> <cffunction name="Save" access="remote"> <cfset var local = {}> <!--- todo: try/catch ---> <cfif arguments.PersonID> <cfquery datasource="#Variables.Datasource#"> UPDATE Person SET FirstName = <cfqueryparam cfsqltype="cf_sql_varchar" value="#arguments.FirstName#"> ,LastName = <cfqueryparam cfsqltype="cf_sql_varchar" value="#arguments.LastName#"> WHERE PersonID = <cfqueryparam cfsqltype="cf_sql_integer" value="#arguments.PersonID#"> </cfquery> <cfset local.result = arguments.PersonID> <cfelse> <cfquery name="local.qry" datasource="#Variables.Datasource#"> INSERT INTO Person(FirstName,LastName) VALUES( <cfqueryparam cfsqltype="cf_sql_varchar" value="#arguments.FirstName#"> ,<cfqueryparam cfsqltype="cf_sql_varchar" value="#arguments.LastName#"> ); SELECT PersonID FROM Person WHERE PersonID=Scope_Identity() </cfquery> <cfset local.result = local.qry.PersonID> </cfif> <cfreturn local.result> </cffunction> </cfcomponent> I need to pass in form.PersonID, form.firstname, form.lastname.

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  • Scope of the c++ using directive

    - by ThomasMcLeod
    From section 7.3.4.2 of the c++11 standard: A using-directive specifies that the names in the nominated namespace can be used in the scope in which the using-directive appears after the using-directive. During unqualified name lookup (3.4.1), the names appear as if they were declared in the nearest enclosing namespace which contains both the using-directive and the nominated namespace. [ Note: In this context, “contains” means “contains directly or indirectly”. —end note ] What do the second and third sentences mean exactly? Please give example. Here is the code I am attempting to understand: namespace A { int i = 7; } namespace B { using namespace A; int i = i + 11; } int main(int argc, char * argv[]) { std::cout << A::i << " " << B::i << std::endl; return 0; } It print "7 7" and not "7 18" as I would expect. Sorry for the typo, the program actually prints "7 11".

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  • Macro not declared in this scope

    - by NmdMystery
    I'm using a preprocessor #define macro to count the number of functions in a header file: #define __INDEX -1 //First group of functions void func1(void); #define __FUNC1_INDEX __INDEX + 1 void func2(void); #define __FUNC2_INDEX __FUNC1_INDEX + 1 #undef __INDEX #define __INDEX __FUNC2_INDEX //Second group of functions void func3(void); #define __FUNC3_INDEX __INDEX + 1 void func4(void); #define __FUNC4_INDEX __FUNC3_INDEX + 1 #undef __INDEX #define __INDEX __FUNC4_INDEX //Third group of functions void func5(void); #define __FUNC5_INDEX __INDEX + 1 void func6(void); #define __FUNC6_INDEX __FUNC5_INDEX + 1 #undef __INDEX #define __INDEX __FUNC6_INDEX #define __NUM_FUNCTIONS __INDEX + 1 The preprocessor gets through the first two sets of functions just fine, but when it reaches the line: #define __FUNC5_INDEX __INDEX + 1 I get a "not defined in this scope" error for __INDEX. What makes this really confusing is the fact that the same exact thing is done [successfully] in the second group of functions; __FUNC3_INDEX takes on the value of __INDEX + 1. There's no typos anywhere, as far as I can tell... what's the problem? I'm using g++ 4.8.

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  • 'area' not declared in this scope

    - by user1641173
    I've just started learning c++ and am trying to write a program for finding the area of a circle. I've written the program and whenever I try to compile it I get 2 error messages. The first is: areaofcircle.cpp:9:14: error: expected unqualified-id before numeric constant and the second is: areaofcircle.cpp:18:5: error: 'area' was not declared in this scope What should I do? I would post a picture, but I'm a new user, so I can't. #include <iostream> using namespace std; #define pi 3.1415926535897932384626433832795 int main() { // Create three float variable values: r, pi, area float r, pi, area; cout << "This program computes the area of a circle." << endl; // Prompt user to enter the radius of the circle, read input value into variable r cout << "Enter the radius of the circle " << endl; cin >> r; // Square r and then multiply by pi area = r * r * pi; cout << "The area is " << area << "." << endl; }

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  • Export data to Excel from Silverlight/WPF DataGrid

    - by outcoldman
    Data export from DataGrid to Excel is very common task, and it can be solved with different ways, and chosen way depend on kind of app which you are design. If you are developing app for enterprise, and it will be installed on several computes, then you can to advance a claim (system requirements) with which your app will be work for client. Or customer will advance system requirements on which your app should work. In this case you can use COM for export (use infrastructure of Excel or OpenOffice). This approach will give you much more flexibility and give you possibility to use all features of Excel app. About this approach I’ll speak below. Other way – your app is for personal use, it can be installed on any home computer, in this case it is not good to ask user to install MS Office or OpenOffice just for using your app. In this way you can use foreign tools for export, or export to xml/html format which MS Office can read (this approach used by JIRA). But in this case will be more difficult to satisfy user tasks, like create document with landscape rotation and with defined fields for printing. At this article I'll show you how to work with Excel object from .NET 4 and Silverlight 4 with dynamic objects and give you an approach which allow you to export data from DataGrid Silverlight and WPF controls. Read more...

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  • Call for Abstracts Now Open for Microsoft ASP.NET Connections (Closing April 26)

    - by plitwin
    We are putting out a call for abstracts to present at the Fall 2010 Microsoft ASP.NET Connections conference in Las Vegas, Nov 9-13 2009. The due date for submissions is April 26, 2010. For submitting sessions, please use this URL: http://www.deeptraining.com/devconnections/abstracts Please keep the abstracts under 200 words each and in one paragraph. No bulleted items and line breaks, and please use a spell-checker. Do not email abstracts, you need to use the web-based tool to submit them. Please submit at least 3 abstracts, but it would help your chances of being selected if you submitted 5 or more abstracts. Also, you are encouraged to suggest all-day pre or post conference workshops as well. We need to finalize the conference content and the tracks layout in just a few short weeks, so we need your abstracts by April 26th. No exceptions will be granted on late submissions! Topics of interest include (but are not limited to):* ASP.NET Webforms* ASP.NET AJAX* ASP.NET MVC* Dynamic Data* Anything else related to ASP.NET For Fall 2010, we are having a seperate Silverlight conference where you can submit abstracts for Silverlight and Windows 7 Phone Development. In fact, you can use the same URL to submit sessions to Microsoft ASP.NET Connections, Silverlight Connections, Visual Studio Connections, or SQL Server Connections. The URL again is:http://www.deeptraining.com/devconnections/abstracts Please realize that while we want a lot of the new and the cool, it's also okay to propose sessions on the more mundane "real world" stuff as it pertains to ASP.NET. What you will get if selected:* $500 per regular conference talk.* Compensation for full-day workshops ranges from $500 for 1-20 attendees to $2500 for 200+ attendees.* Coach airfare and hotel stay paid by the conference.* Free admission to all of the co-located conferences* Speaker party* The adoration of attendees* etc. Your continued suport of Microsoft ASP.NET Connections and the other DevConnections conferences is appreciated. Good luck and thank you,Paul LitwinMicrosoft ASP.NET Conference Chair

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  • Dynamic (C# 4.0) &amp; Var in a nutshell.

    - by mbcrump
    A Var is static typed - the compiler and runtime know the type. This can be used to save some keystrokes. The following are identical. Code Snippet var mike = "var demo"; Console.WriteLine(mike.GetType());  //Returns System.String   string mike2 = "string Demo"; Console.WriteLine(mike2.GetType()); //Returns System.String A dynamic behaves like an object, but with dynamic dispatch. The compiler doesn’t know anything about it at compile time. Code Snippet dynamic duo = "dynamic duo"; Console.WriteLine(duo.GetType()); //System.String //duo.BlowUp(); //A dynamic type does not know if this exist until run-time. Console.ReadLine(); To further illustrate this point, the dynamic type called “duo” calls a method that does not exist called BlowUp(). As you can see from the screenshot below, the compiler is reporting no errors even though BlowUp() does not exist. The program will compile fine. It will however throw a runtimebinder exception after it hits that line of code in runtime. Let’s try the same thing with a Var. This time, we get a compiler error that says BlowUp() does not exist. This program will not compile until we add a BlowUp() method.  I hope this helps with your understand of the two. If not, then drop me a line and I’ll be glad to answer it.

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  • Matlab: Why is '1' + 1 == 50? [migrated]

    - by phi
    Matlab has weak dynamic typing, which is what causes this weird behaviour. What I do not understand is what exactly happens, as this result really surprises me. Edit: To clarify, what I'm describing is clearly a result of Matlab storing chars in ASCII-format, which was also mentioned in the comments. I'm more interested in the way Matlab handles its variables, and specifically, how and when it assigns a type/tag to the values. Thanks. '1' is a 1-by-1 matrix of chars in matlab and '123' is a 1-by-3 matrix of chars. As expected, 1 returns a 1-by-1 double. Now if I enter '1' + 1 I get 50 as a 1-by-1 double, and if I enter '123' + 1 I get a 1-by-3 double [ 50 51 52 ] Furthermore, if I type 'a' + 1 the result is 98 in a 1-by-1 double. I assume this has to do with how Matlab stores char-variables in ascii form, but how exactly is it handling these? Are the data actually unityped and tagged, or how does it work? Thanks.

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  • Is it justified to use project-wide unique function and variable names to help future refactoring?

    - by kahoon
    Refactoring tools (like ReSharper) often can't be sure whether to rename a given identifier when, for example refactoring a JavaScript function. I guess this is a consequence of JavaScript's dynamic nature. ReSharper solves this problem by offering to rename reasonable lexical matches too. The developer can opt out of renaming certain functions, if he finds that the lexical match is purely accidental. This means that the developer has to approve every instance that will be affected by the renaming. For example let's consider we have two Backbone classes which are used completely independently from each other in our application: var Header = Backbone.View.extend({ close: function() {...} }) var Dialog = Backbone.View.extend({ close: function() {...} }) If you try to rename Dialog's close method to for example closeAndNotify, then ReSharper will offer to rename all occurences of Header's close method just because they are the same lexically prior to the renaming. To avoid this problem, please consider this: var Header = Backbone.View.extend({ closeHeader: function() {...} }) var Dialog = Backbone.View.extend({ closeDialog: function() {...} }) Now you can rename closeDialog unambiguously - given that you have no other classes having a method with the same name. Is it worth it to name my functions this way to help future refactoring?

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  • Objective-C Out of scope problem

    - by davbryn
    Hi, I'm having a few problems with some Objective-C and would appreciate some pointers. So I have a class MapFileGroup which has the following simple interface (There are other member variables but they aren't important): @interface MapFileGroup : NSObject { NSMutableArray *mapArray; } @property (nonatomic, retain) NSMutableArray *mapArray; mapArray is @synthesize'd in the .m file. It has an init method: -(MapFileGroup*) init { self = [super init]; if (self) { mapArray = [NSMutableArray arrayWithCapacity: 10]; } return self; } It also has a method for adding a custom object to the array: -(BOOL) addMapFile:(MapFile*) mapfile { if (mapfile == nil) return NO; mapArray addObject:mapfile]; return YES; } The problem I get comes when I want to use this class - obviously due to a misunderstanding of memory management on my part. In my view controller I declare as follows: (in the @interface): MapFileGroup *fullGroupOfMaps; With @property @property (nonatomic, retain) MapFileGroup *fullGroupOfMaps; Then in the .m file I have a function called loadMapData that does the following: MapFileGroup *mapContainer = [[MapFileGroup alloc] init]; // create a predicate that we can use to filter an array // for all strings ending in .png (case insensitive) NSPredicate *caseInsensitivePNGFiles = [NSPredicate predicateWithFormat:@"SELF endswith[c] '.png'"]; mapNames = [unfilteredArray filteredArrayUsingPredicate:caseInsensitivePNGFiles]; [mapNames retain]; NSEnumerator * enumerator = [mapNames objectEnumerator]; NSString * currentFileName; NSString *nameOfMap; MapFile *mapfile; while(currentFileName = [enumerator nextObject]) { nameOfMap = [currentFileName substringToIndex:[currentFileName length]-4]; //strip the extension mapfile = [[MapFile alloc] initWithName:nameOfMap]; [mapfile retain]; // add to array [fullGroupOfMaps addMapFile:mapfile]; } This seems to work ok (Though I can tell I've not got the memory management working properly, I'm still learning Objective-C); however, I have an (IBAction) that interacts with the fullGroupOfMaps later. It calls a method within fullGroupOfMaps, but if I step into the class from that line while debugging, all fullGroupOfMaps's objects are now out of scope and I get a crash. So apologies for the long question and big amount of code, but I guess my main question it: How should I handle a class with an NSMutableArray as an instance variable? What is the proper way of creating objects to be added to the class so that they don't get freed before I'm done with them? Many thanks

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  • GLOBALS ARE BAAAAAAADDDD!!!!!

    - by Matt
    HOWEVER! would setting the $link to my database be one thing that I prolly should use a GLOBAL scope for? In my setting of (lots of functions)...it seems as though having only one variable that is on the global scope would be wise. I am currently using the functions to transfer it back and forth so that way I do not have it on global...but it is a bit of a hinder to my script. Please Advise, Thank you. Matt

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