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  • Lexical and dynamic scoping in Mathematica: Local variables with Module, With, and Block

    - by dreeves
    The following code returns 14 as you'd expect: Block[{expr}, expr = 2 z; f[z_] = expr; f[7]] But if you change that Block to a Module then it returns 2*z. It seems to not matter what other variables besides expr you localize. I thought I understood Module, Block, and With in Mathematica but I can't explain the difference in behavior between Module and Block in this example. Related resources: Tutorial on Modularity and the Naming of Things from the Mathematica documentation Excerpt from a book by Paul R. Wellin, Richard J. Gaylord, and Samuel N. Kamin Explanation from Dave Withoff on the Mathematica newsgroup

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  • How do I prepare myself for a summer of working on Python using Linux environment?

    - by Shailesh Tainwala
    Hi, I have used just Windows for programming so far. Now, I have an internship starting in two weeks and I will be using just Linux environment with Python programming language. I've installed Ubuntu on my system but have no exposure to shell scripting. I need some advice on how I can quickly learn to use the Linux terminal quickly. Any books or web resources that you can suggest? Also, is there a particular IDE that is generally preferred for Python programming on Linux, or is Vim preferred? How can I best prepare myself for the internship ahead? Thanks for taking the time.

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  • How to Exclude poperties file from jar file ?

    - by Nisarg Mehta
    Hi All, I have a java application for exaple see below. myProject | |----src | | | |--main | | | |--resources | | | |--userConfig.properties | |--log4j.properties | |---target I am using Maven to build my project .I am using maven command to build jar file. mvn package -DMaven.test.skip=true I want to exclude userConfig.properties file from my jar file so i have mentioned in pom.xml as below. <excludes> <exclude>**/userConfig.properties</exclude> </excludes> but it will exclude from the target folder in which compile code resides. And Application will not run because it will not find the userConfig.properties. Can anyone help me ? Thanks Nisarg Mehta

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  • Ruby on Rails: Routing error

    - by JamesMcL13
    I am having trouble deleting and showing user records. Here is my routes.rb FinalApp::Application.routes.draw do resources :admin devise_for :users, :controllers => { :registrations => 'admin' } resources :projects match "search" => "projects#search", :as => :search root :to => 'projects#index' end Here is my admin controller: class AdminController < ApplicationController def index @users = User.all respond_to do |format| format.html # index.html.erb format.json { render :json => @users } end end def create @user = User.new(params[:user]) respond_to do |format| if @user.save format.html { redirect_to @user, notice: 'User was successfully created.' } format.json { render json: @user, status: :created, location: @user } else format.html { render action: "new" } format.json { render json: @user.errors, status: :unprocessable_entity } end end end # GET /users/1 # GET /users/1.json def show @user = User.find(params[:id]) @user_user_id = params[:id] respond_to do |format| format.html # show.html.erb format.json { render json: @user } end end # GET /users/new # GET /users/new.json def new @user = User.new respond_to do |format| format.html # new.html.erb format.json { render json: @user } end end # GET /users/1/edit def edit @user = User.find(params[:id]) end # POST /users # POST /users.json # PUT /users/1 # PUT /users/1.json def update @user = User.find(params[:id]) respond_to do |format| if @user.update_attributes(params[:user]) format.html { redirect_to @user, notice: 'User was successfully updated.' } format.json { head :no_content } else format.html { render action: "edit" } format.json { render json: @user.errors, status: :unprocessable_entity } end end end # DELETE /users/1 # DELETE /users/1.json def destroy @user = User.find(params[:id]) @user.destroy respond_to do |format| format.html { redirect_to users_url } format.json { head :no_content } end end end Here is my view: <%= stylesheet_link_tag "admin" %> <body> <div id ="title1">Admin</div> <div class ="menu"></div> <div id ="section3"> <table id = "mytable"> <table border = "1"> <tr> <th>Username </th> <th>Email</th> <th>First Name</th> <th>Last Name</th> <th>Admin?</th> <th></th> <th></th> <th></th> </tr> <%= link_to "New User", admin_new_path %><br /> <% @users.each do |t| %> <tr> <td><%= t.username %></td> <td><%= t.email %></td> <td><%= t.firstname %></td> <td><%= t.lastname %></td> <td><%= t.admin %></td> <td><%= link_to 'Show', t %></td> <td> <%= button_to "Delete", t, method: :delete, data: { confirm: 'Are you sure?' } %></td> </tr> <% end %> </table></br> </body> </html> I can display the User database, but when I go to delete a record. I get this error No route matches [DELETE] "/users/11". I am new to rails so please remember this when trying to help. Thanks in advance. Edit: here are my routes = admin_index GET /admin(.:format) admin#index POST /admin(.:format) admin#create new_admin GET /admin/new(.:format) admin#new edit_admin GET /admin/:id/edit(.:format) admin#edit admin GET /admin/:id(.:format) admin#show PUT /admin/:id(.:format) admin#update DELETE /admin/:id(.:format) admin#destroy new_user_session GET /users/sign_in(.:format) devise/sessions#new user_session POST /users/sign_in(.:format) devise/sessions#create destroy_user_session DELETE /users/sign_out(.:format) devise/sessions#destroy user_password POST /users/password(.:format) devise/passwords#create new_user_password GET /users/password/new(.:format) devise/passwords#new edit_user_password GET /users/password/edit(.:format) devise/passwords#edit PUT /users/password(.:format) devise/passwords#update cancel_user_registration GET /users/cancel(.:format) admin#cancel user_registration POST /users(.:format) admin#create new_user_registration GET /users/sign_up(.:format) admin#new edit_user_registration GET /users/edit(.:format) admin#edit PUT /users(.:format) admin#update DELETE /users(.:format) admin#destroy projects GET /projects(.:format) projects#index POST /projects(.:format) projects#create new_project GET /projects/new(.:format) projects#new edit_project GET /projects/:id/edit(.:format) projects#edit project GET /projects/:id(.:format) projects#show PUT /projects/:id(.:format) projects#update DELETE /projects/:id(.:format) projects#destroy search /search(.:format) projects#search root / projects#index

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  • Advanced Rails Routing of short URL's and usernames off of root url

    - by Michael Waxman
    I want to have username URL's and Base 58 short URL's to resources both off of the root url like this: http://mydomain.com/username #=> goes to given user http://mydomain.com/a3x9 #=> goes to given story I am aware of the possibilities of a user names conflicting with short urls, and I have a workaround, but what I can't figure out is the best way to set this up in rails. Can I do it in rails routes? Should I do something with a piece of Rack middleware? Should I set up a routing controller? Please let me know the best way to do this. Thanks so much!

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  • Custom UITableviewcell shows "fatal error: Can't unwrap Optional.None" issue in swift

    - by user1656286
    I need to load a custom cell in a UITableView. I created a custom subclass of UITableViewCell named "CustomTableViewCell". I have added a UITabelViewCell to the tableview (using drag and drop) as shown in figure. Then in file inspector I set the class of that UITabelViewCell to be "CustomTableViewCell". Here is my code: class ViewController: UIViewController,UITableViewDelegate,UITableViewDataSource { @IBOutlet var tableView : UITableView var items = String[]() override func viewDidLoad() { super.viewDidLoad() items = ["Hi","Hello","How"] self.tableView.registerClass(CustomTableViewCell.self, forCellReuseIdentifier: "CusTomCell") // Do any additional setup after loading the view, typically from a nib. } func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int{ return items.count } func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell!{ var cell:CustomTableViewCell = self.tableView.dequeueReusableCellWithIdentifier("CusTomCell") as CustomTableViewCell cell.labelTitle.text = items[indexPath.row] return cell; } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } } When I run my code, I get the following error: "fatal error: Can't unwrap Optional.None" as seen in the image.

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  • PHP-FPM Pool, Child Processes and Memory Consumption

    - by Jhilke Dai
    In my PHP-FPM configuration I have 3 Pools, the eg: Config is: ;;;;;;;;;;;;;;;;;;;;;;; ; Pool 1 ; ;;;;;;;;;;;;;;;;;;;;;;; [www1] user = www group = www listen = /tmp/php-fpm1.sock; listen.backlog = -1 listen.owner = www listen.group = www listen.mode = 0666 pm = dynamic pm.max_children = 40 pm.start_servers = 6 pm.min_spare_servers = 6 pm.max_spare_servers = 12 pm.max_requests = 250 slowlog = /var/log/php/$pool.log.slow request_slowlog_timeout = 5s request_terminate_timeout = 120s rlimit_files = 131072 ;;;;;;;;;;;;;;;;;;;;;;; ; Pool 2 ; ;;;;;;;;;;;;;;;;;;;;;;; [www2] user = www group = www listen = /tmp/php-fpm2.sock; listen.backlog = -1 listen.owner = www listen.group = www listen.mode = 0666 pm = dynamic pm.max_children = 40 pm.start_servers = 6 pm.min_spare_servers = 6 pm.max_spare_servers = 12 pm.max_requests = 250 slowlog = /var/log/php/$pool.log.slow request_slowlog_timeout = 5s request_terminate_timeout = 120s rlimit_files = 131072 ;;;;;;;;;;;;;;;;;;;;;;; ; Pool 3 ; ;;;;;;;;;;;;;;;;;;;;;;; [www3] user = www group = www listen = /tmp/php-fpm3.sock; listen.backlog = -1 listen.owner = www listen.group = www listen.mode = 0666 pm = dynamic pm.max_children = 40 pm.start_servers = 6 pm.min_spare_servers = 6 pm.max_spare_servers = 12 pm.max_requests = 250 slowlog = /var/log/php/$pool.log.slow request_slowlog_timeout = 5s request_terminate_timeout = 120s rlimit_files = 131072 I calculated the pm.max_children processes according to some example calculations on the web like 40 x 40 Mb = 1600 Mb. I have separated 4 GB of RAM for PHP, now according to the calculations 40 Child Processes via one socket, and I have total of 3 sockets in my Nginx and FPM configuration. My doubt is about the amount of memory consumption by those child processes. I tried to create high load in the server via httperf hog and siege but I could not calculate the accurate memory usage by all the PHP processes (other processes like MySQL and Nginx were also running). And all the sockets were in use, So, I seek guidance from anyone who have done this before or know how exactly the pm.max_children in PHP Works. Since I have 3 Pools/sockets with 40 child processes does that count to 3 x 40 x 40 Mb of Memory usage ? or it is just like 40 Max. Child processes sharing 3 sockets (and the total memory usage is just 40 x 40 Mb) ?

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  • Scope of the Pages in a Silverlight application

    - by AngryHacker
    I have an app built with the Silverlight Navigation Application Template. I have a main form (e.g. MainPage.xaml) and a bunch of Silverlight Pages, which are swapped in and out of the main content area. In the MainPage.xaml, I have a DispatcherTimer which hits some Uri resources, regardless of which page I am on. Every now and then, it will inexplicably stop firing. I have an inkling that it has to do with the scope of various pages. Can pages inside the MainPage.xaml take away the scope from its parent? Or is this something much simpler?

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  • ItemStyle-VerticalAlign="Middle" not work in asp:GridView

    - by pablogrind
    Why ItemStyle-VerticalAlign="Middle" not work in asp:GridView?, this is my code <asp:GridView ID="GridView1" runat="server" RowStyle-VerticalAlign="Middle" > <Columns> <asp:TemplateField ItemStyle-VerticalAlign="Middle" HeaderText='<%$ Resources:Language, Admin_Employee_TimeTracker_GV_Code %>'> <ItemTemplate> <asp:TextBox id="txtReferenceCode" runat="server" text='<%# Bind("referenceCode")%>' MaxLength="100" Width="100px"></asp:TextBox> </ItemTemplate> <ItemStyle VerticalAlign="Middle" /> </asp:TemplateField>

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  • Object not disposed after calling the Dispose() function.

    - by Pavan Navali
    Hi, I have query regarding the disposing of an object. The scenario is as follows. In a Desktop Appication, developed in C#, I have a function in which a object in created like this. namespace Class 1 { variables section; .... .... Function1() { local variables; try { Object1 obj = new Object1(); .... .... if(true) { .... } else { **obj.Dispose();** } } catch() {} finally {} } } The object is not disposed when the else part is executed. The msdn link for this is http://msdn.microsoft.com/en-us/library/system.componentmodel.component.dispose(VS.90).aspx according to which the component should realase all the resources used by it. I would like to know, why the object is not disposed. Thank you. Pavan Navali.

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  • How to go to the next level integrating animations in WPF applications with Blend / VS2008?

    - by Edward Tanguay
    I have been able to create little animations with the storyline in Blend. And I have been able to copy in the isolated storylines and triggers into existing projects in visual studio to spruce them up on the edges a little bit. But after adding too many animations, they start to conflict or cancel each other out, etc., or I can make a panel slide down and slide it back up, then it no longer can slide down since it is not in its original state anymore. Does anyone have any links, video tutorials, books, resources which not only show you how to make a little animation and then leave you to figure out how to integrate numerous animations into a typical business application layout, but instead take you through the whole process of building a business application while integrating animations and WPF goodness with Blend and Visual Studio?

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  • Why use MVVM???

    - by LnDCobra
    Okay, I have been looking into MVVM pattern, and each time I have previously tried looking into it, I gave up for a number of reasons: Unnecessary Extra Long Winded Coding No apparent advantages for coders (no designers in my office. Currently only myself soon to be another coder) Not a lot of resources/documentation of good practices! (Or at least hard to find) Cannot think of a single scenario where this is advantageous. I'm about to give up on it yet again, and thought I'd ask to see if someone answer the reasons above. I honestly can't see an advantage of using this for a single/partner coding. Even in complex projects with 10's of windows. To me the DataSet is a good enough view and binding like in the answer by Brent following question

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  • Making complex queries through SQLiteDatabase

    - by Luca
    Hi! I'm using the Android MediaProvider application to get information regarding the resources registered in the media library. The only way I found to do this is to use the ContentProvider class provided by the MediaProvider application. Unfortunately, it seems to me this is quite a limitation, isn't it? Is it possible this way to create complex queries with subqueries and using other functions of SQLite? I thought that it may be possible using the SQLiteDatabase class, but it seems it is not possible to open the database directly with its path, and anyway, the query method seems not to allow subqueries. Any solution to this? Thanks!

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  • C/C++ for Core Logic Development of a Web Application?

    - by Ramiz Uddin
    Can C/C++ be choice of keeping all your logic (business/domain) for web application? Why? I've two resources (cousins) having knowledge on C/C++ and me also good in C/C++, Python, HTML, CSS and JavaScript. We like to utilize our free time to work on our some good ideas we developed together. The ideas require knowledge of web application development. And I'm the only one who has it. Is there a way they developed the core in C/C++ and I do the rest of scripting for front-end development? Thanks.

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  • Open source project home page

    - by Oskar Kjellin
    I've created a software that I want to be able to market. I'd like to be able to post it on forums etc and for that I need a home page. Is there any open source C# project home pages that you can use? The functionality I'm looking for is like adding new versions (perhaps a version control from the software), downloading and user guides. So what I want is pretty basic: I want to be able to upload and let the users download. I've written this on my own as well but I guess that if there are open source projects that have done this they're probably better. This can't be such a rare problem so please lead me to some resources so that I can create my page and publish my software! :)

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  • Web Standards alternatives to Flex/Silverlight (I mean serious alternatives, not just JS framewoks)

    - by user252160
    Is there a set of open standards technologies that I can use to achieve the same way of development as in Flex and Sivlerlight? I am talking about componentization, separation of concerns, rich graphics, states and effects . Please point out some tutorials and other resources if possible. P.S. I KNOW that this is technically possible, so please do not respond by sending google search results or general JQuery tutorials. I've seen those already. I need to know how a Flex / Silverlight developer could design and implement an application in roughly the same way (imagine a rich HTML tag set, much like XAML/MXML, behind which stands JavaScript responsible for handling events and business logic. Think also about binding)

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  • Use same project to create multiple applications on same device

    - by Mark.Prof
    I am deploying a reader application with it's document packaged in the asset folder. Any branding is done by dynamically generating xml and resources as appropriate. The application name itself is also generated. Since it is the tag's "package" property that needs to be unique, I nevertheless have a problem installing more than one instance of this app. I would like to dynamically edit the manifest package attribute's value to reflect the document and brand that I am building. But this causes build problems, specifically the location of R.java is no longer available to the component package under which the code resides. Originally, the component package is the same as the application manifest package. But precisely this manifest package name is the part that needs to be variable. How should I best proceed?

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  • Where do Java Applets live?

    - by Wendi Peters
    I'm trying to figure out where java Applets that I run from the browser live. I'm using Firefox 3.0 on Windows XP with Java 1.6 if that makes any difference. From the Java Control Panel on the toolbar, I can access "Temporary Internet Files - Settings" to find the Java cache. From there I can show the resources and see a file called "dws2010066.dat". Does this resource correspond to a file on disk? I did a search in the Java cache/my whole computer and came up empty handed.

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  • How can I change the name of a dynamic assembly after it has been created?

    - by Samuel Jack
    Is there any way to change the name of a dynamic assembly after it has been created? I'm using a framework that uses dynamic methods, and it is creating a dynamic assembly with the same name as my main assembly (which causes problems with WPF when it tries to load resources). So I need to find a workaround, and I thought of trying to change the name of the dynamic assembly. I've tried using GetName() and then setting the Name property, but it appears that GetName returns a clone of the name because my change doesn't stick. What else can I try?

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  • Calculation with RESTful web service with MySQL database

    - by Dobby
    I am now making some RESTful web services with MySQL database. I used NetBeans to create the resources of RESTful service with MySQL, and now I can now use GET and POST/PUT to list and add/modify data entities in the MySQL server. Currently, I wish to make some calculations right after a client makes the POST activities, then the posted data with calculated results will be inserted into the MySQL database. I am very new to this, I guess I need to add some functions and call them to calculate but I don't know where and how to do that : ( Could any one help me on this issue? Thanks a lot in advance! : )

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  • Self Assesstment Tests for Programmers

    - by THX1138.6
    I want to help the Dev team identify areas of knowledge (practical and theoretical) that they can work on. Though I am big believer in focusing on people's strengths being a good programmer requires (I think) being challenged by concepts and ideas that don't always come naturally. We work largely in the web app space using PHP & MySQL but better skills in data modelling, query optimisation, use of MVC and OOP etc. would help the team and the company a lot. I want to help the Dev team manage their careers, explore and expand their skills sets. Be all they can be and better than they were previously. I know its an idealistic goal but work must be about more than simply getting the work done. There should be some time to review, to learn, to grow and get better. Any thoughts, ideas, opinions and directions to tests or similar resources would be greatly appreciated.

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  • android: customized text selector

    - by Yang
    I wanted to design a customized text selector that changed the text color when user clicks the TextView. But got the following error: java.lang.RuntimeException: Unable to start activity ComponentInfo{}: android.view.InflateException: Binary XML file line #55: Error inflating class here is what I have: res/text_selector.xml <selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_enabled="false" android:state_focused="true" android:drawable="@color/black" /> <item android:state_pressed="true" android:drawable="@color/blue" /> <item android:state_focused="true" android:drawable="@color/black" /> </selector> layout/textview.xml <TextView android:id = "@+id/last_page_button" android:text="@string/last_page_button_string" android:gravity="center_horizontal" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="#ffffff" android:textColor = "@drawable/text_selector" android:layout_weight="1" /> values/color.xml <resources> <color name="white">#ffffffff</color> <color name="black">#ff000000</color> <color name="blue">#ffccddff</color>

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  • embed ttf as embeded resource can't reference it

    - by HoNgOuRu
    Hi, I've just added a ttf file to the project (c# 2008 express) as "file" and build option to embeded resource. I'm having problems when trying to set this font like this: (I know the next line is wrong...) this.label1.Font = AlarmWatch.Properties.Resources.Baby_Universe; Error 1 Cannot implicitly convert type 'byte[]' to 'System.Drawing.Font' C:\Users\hongo\Documents\Visual Studio 2008\Projects\AlarmWatch\AlarmWatch\Form1.Designer.cs 57 32 AlarmWatch I know it is byte[] cause I've set the option build as embeded resource, but...comparing with this line that is correct "this.label1.Font = new System.Drawing.Font("OCR A Extended", 24F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));" How can I set this.label1 to use the new font??? thanks

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  • Machine restricted login access

    - by Sunil Shenoy
    I am working on a project that has a requirement such that login details can only be accessed from one machine at one time. For example, if I grant you access to my website and you login from your home machine, the system will store this settings in a cookie/database. Now if you try the same login details on your work machine or any other machine, the system will not let you log into the system. The login will now only work from home machine. Any suggestions on how to achieve this would be helpful. Any resources you can point me towards would also be appreciated.

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  • Using jQuery's $.getScript(), can I sense 304 Not Modified Headers?

    - by Tom
    I have an application (a widget) where I use $.getScript() on a 5 minute timer, loading a file every five minutes. I then take the contents of the file I just downloaded, and rebuild my page, so that my widget can update. Most of the time, however, the file is unchanged, and firebug displays a 304 Not Modified header every 5 minutes, as my timer executes $.getScript(). I would like to sense when the file is not modified, so that I don't use up user resources, rebuilding the page for no reason. Is it possible to obtain html headers when using $.getScript()?

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