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• Problems with dynamic programming

  - by xan

  I've got difficulties with understanding dynamic programming, so I decided to solve some problems. I know basic dynamic algorithms like longest common subsequence, knapsack problem, but I know them because I read them, but I can't come up with something on my own :-( For example we have subsequence of natural numbers. Every number we can take with plus or minus. At the end we take absolute value of this sum. For every subsequence find the lowest possible result. in1: 10 3 5 4; out1: 2 in2: 4 11 5 5 5; out2: 0 in3: 10 50 60 65 90 100; out3: 5 explanation for 3rd: 5 = |10+50+60+65-90-100| what it worse my friend told me that it is simple knapsack problem, but I can't see any knapsack here. Is dynamic programming something difficult or only I have big problems with it?

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• Controlling access to large files in Apache

  - by obeattie

  Hi there, I am looking to control access to some large files (we're talking many GB here) by the use of signed URLs. The files are currently restricted by LDAP Basic authentication (mod_auth_ldap), but I need to change this to verify the signature (passed as a query parameter in the URL). Basically, I just need to run a script to verify the signature, and allow the request to proceed as if authentication had succeeded. My initial thought to this was just to use a simple CGI script, but as the files are so large I'm concerned about performance. So, really, this question is (probably) more like "are there any performance implications of streaming large files from a CGI script via Apache?"… and if so, "is there a better way of doing this (short of writing a dedicated authentication module)?" If this makes any sense, help would be much appreciated :) P.S. I wasn't sure exactly what to search for for this (10 minutes of Googling were fruitless), so I may very well be duplicating someone else's post.

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• Node.JS Server Cuts Off Frequently?

  - by aherrick

  I have a Node JS Server where I am using Socket.IO to stream content to the browser. It works great for about 45 minutes or so of streaming, then it will usually cut out. There are no "errors" reported in the terminal and the Node server acts like it is in, however the page I am serving clearly stops working. What are my options for trying to get to the bottom of this? Could this be a configuration issue with Node/Socket.IO? is there any basic error logging you would recommend I setup?

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• YUI Datatable Not Taking JSON

  - by Pete Herbert Penito

  I am trying to fill a Datatable with a JSON using YUI, I have this JSON: [{"test":"value1", "test2":"value2", "test3":"value3", "topic_id":"123139007E57", "gmt_timestamp":1553994442, "timestamp_diff":-1292784933382, "status":"images\/statusUp.png", "device_id":"568FDE9CC7275FA"}, .. It continues like this with about 20 different devices, and I close it with a ] I just want to print select keys in the datatable so my Column Definitions look like this: var myColumnDefs = [ {key:"test", sortable:true, resizeable:true}, {key:"test2", sortable:true, resizeable:true}, {key:"topic_id", sortable:true, resizeable:true}, {key:"status", sortable:true, resizeable:true}, {key:"device_id", sortable:true, resizeable:true}, ]; var myDataSource = new YAHOO.util.DataSource(bookorders); myDataSource.responseType = YAHOO.util.DataSource.TYPE_JSARRAY; myDataSource.responseSchema = { fields: ["test","test2","topic_id","status","device_id"] }; var myDataTable = new YAHOO.widget.DataTable("basic", myColumnDefs, myDataSource); It's print Data Error for some reason, what am I doing wrong? Thanks! I have tested the validity of the JSON at JSONLint and it says it is valid.

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• iPhone MVC Question

  - by HM1

  Hi, I'm bit of a newbie and had a basic question regarding adhering to the MVC model in iPhone coding. How do I setup a Model class that holds my data and connect it to different controllers in the following setup: Using Interface Builder, I created a tab controller in which - Tab #1 has a Nav Controller and a hierarchy of View Controllers. - Tab #2 has a View Controller So with what I have now, the View Controller under Tab #1 alloc init's the model class and I know how to pass the model from one ViewController to the next in the Navigation Hierarchy where it can pass the data and/or be updated with new data. Question is how to pass it from Tab #1's View Controller to Tab #2 View Controller as there is no code linking the two??? Thanks in advance, Hiren.

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• jQuery textbox required validation based on another text box having text

  - by doug

  Pretty basic question, however, I am very new to jQuery and javascript in general. I have a jQuery validation that is requiring a text box to have text in it, if a checkbox is checked. <script type="text/javascript"> $(document).ready(function () { $("form").validate( { rules: { Comments: { required: "#IsAbnormal:checked" } }, messages: { Comments: { required: "Comments are required" } }, onkeyup: false, wrapper: "", errorLabelContainer: "#ErrorMessageBox" }); }); Pretty straight forward, if you check the IsAbnormal checkbox, it will throw a validation if there are no comments. What I am trying to do is require a textbox based on if another text box has any text in it, for instance require the old password if a user enters a new password into a textbox. Is there an easy way to get the required: "#NewPassword:NotBlank" to work?

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• CAD/CAM without C++

  - by zaladane

  Hello, Is it possible to do CAD/CAM software without having to use C++? My company developed their software with c/C++ but that was more than 10 years ago. Today,there is a lot of legacy code that switching would force us to get rid of but i was wondering what the actual risks are. We have a lot of mathematical algorithms for toolpath calculations, feature recognition and simulation and 3D Rendering and i was wondering if C# can handles all of that without great performance loss. Is it a utopia to rewrite such algorithms in c# or should that language only deal with UI. We are not talking about game development here (Halo 3 or Call Of Duty) so how much processing does CAD/CAM really need? Can anybody enlighten me on this matter? Most of my colleagues are hardcore C++ programmers and although i program in c++ i love .NET but i am having a hard time selling .NET to them other than basic UI. Does it make sense to consider switching to .NET in such a field, or is it just not a wise idea? Thank you

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• What's a good book for learning BCPL?

  - by paxdiablo

  A long time ago, I worked on some BCPL code (very similar to C although even more basic, difficult though that is to imagine). Now, as part of a compiler course, we're going to be setting assignments for building some of the parts of the compiler (lexical and semantic analysis) and I'd like to know what the community thinks is the best book for learning about the language (and concrete why you think it's the best). Not how to write compilers for it, just on how to program in it. It'll be up to the students themselves to figure out how best to develop a compiler. We're using BCPL since the chance of people being able to plagiarise code for a compiler is very slim. Any suggestions?

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• Ranged integers in .NET (or C#)

  - by Mal Ross

  Am I being blind, or does the .NET framework not provide any kind of ranged integer class? That is, a type that would prevent you setting a value outside some given bounds that are not the full range of the basic data type. For example, an integer type that would restrict its values to between 1 and 100. Showing my age here, but back in '93, I remember using that sort of thing in Modula-2 (eeek!), but I've not seen explicit framework / language support for it since. Am I just missing something, or is it a case of "it's so simple to make your own that the framework doesn't bother"? Cheers.

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• Sliding & Fading controls on a C# form

  - by Tommy

  Hey there, I'm trying to implement a way to slide&fade controls around (more than one at the same time possibly) elegantly. So in other words, say i had a picture in the top left corner, and a texbox in the bottom right corner, i'd like to be able to have them slide. not just snap. slide, to the opposite corners and replace eachothers position. Ive been working for awhile but have not come up with anything efficient, even just some of the basic math calculations would be a great start.

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• iPhone - Landscape Only App

  - by Robert

  Hello all! I am trying to make an app that will only be viewed in Landscape. I have looked up some tutorials (albeit older ones) and have done the following: -set up the info.plist to include a key for uiinterfaceorientation -in the main view controller I have set the frame to be 480 x 320 Now, the first screen loads up ok. Everything is where it should be and whatnot. However, if I click a button that is set to present a modal view controller nothing happens. Everything is linked and coded correctly but nothing happens when I press the button. Am I doing something wrong with trying to force landscape? At it's basic, this question is a how do you effectively make an app that will only be in landscape mode? Thanks for any help.

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• Is it possible to start an activity in a different apk using startActivity on Android using the acti

  - by icecream

  I have tried to write an Android application with an activity that should be launched from a different application. It is not a content provider, just an app with a gui that should not be listed among the installed applications. I have tried the code examples here and it seems to be quite easy to launch existing providers and so on, but I fail to figure out how to just write a "hidden" app and launch it from a different one. The basic use case is: App A is a normal apk launchable from the application list. App B is a different apk with known package and activity names, but is is not visible or launchable from the application list. App A launches app B using the package and class names (or perhaps a URI constructed from these?). I fail in the third step. Is it possible to do this?

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• A Simple C# DLL - how do I call it from Excel, Access, VBA, VB6 ?

  - by divinci

  Hi all, I have a simple class library written in c#. using System; namespace TestDll { public class Test { public string HelloWorld { get { return "Hello World"; } } } } My question is how can I call this HelloWorld function from Microsoft Office Visual Basic (which I think is VB6)? My first step was to add the DLL as a reference - but on browsing and selecting the compiled DLL the message "Can't add a reference to the specified file." was thrown. Can anyone point me in the right direction as to why/how to get this working? Thanks in advance SO!

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• How to imitate the workflow view of Automator?

  - by andyfeind

  I’m starting to develop my first full-blown Cocoa application containing a view which I would like to behave (and look) similar to Automator’s AMWorkflowView. The basic features I’d like to achieve: Positioning of subviews Display of subviews in expanded / collapsed states Multiple selection Drag and drop In order to get accustomed to Cocoa, I started with a custom NSView which mainly served as a container for the custom subviews and handled their positioning and multiple selection. The subviews are also subclasses of NSView, and contain a variable amount of views themselves, like buttons, labels and popup menus, and therefore can have different heights. This worked quite well, but before going on, I want to make sure to have everything neat and tidy according to the MVC pattern. I suspect that there already is a class in Cocoa that facilitates the implementation of a view container, like maybe NSCollectionView. It seems that there is no (easy) way to display differently sized views in an NSCollectionView, though. Should I continue implementing my custom NSView (probably using an NSArrayController for selection and sorting support), or are there better ways to go? Any help is much appreciated

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• How to Tweet from multiple acounts with twitter Gem in Rails?

  - by Jmlevick

  I have an application wich has Oauth access using Twitter as provider. I also have the ability to ask the logged user permisson to Read and Write in his/her account and once a user authorized the app, I can send tweets as the user with something like: u = User.find(id) u.twitter.update("Some-Status-Here") in the rails console... What I want to do is to Tweet as all the users in one command, but if I try something like: u = User.all u.twitter.update("Some-Status-Here") I get this error: undefined method `twitter' for #<Array:0x00000002e2f188> How can I tweet as all the users in one command? What am I doing wrong? I feel it is a very basic thing I'm missing... Can someone help me? Thank You.

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• jQuery - getting the id of the item selected

  - by John Leonard

  I have a basic jQuery selector question. Let's say I'm parsing JSON and generating a row of data for each item in my result set. On each item row, I want an action button. What is the best practice to script that button so its click action can reference the data specific to that row? Starting with the block below, how do I generate a 'Click Me' button that when clicked will alert with its json data? $.getJSON(url,params,function(json){ if(json.items){ $.each(json.items, function(i, n){ var item = json.items[i];

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• Implementing a recursive menu system a'la Joomla in CodeIgniter

  - by pettersolberg

  Hi I have some sites powered by Joomla, but with my current assignment I wanted to try something new and created with CodeIgniter a really basic CMS (just to suit my client's needs). Everything works fine except menus - multilevel menus like in Joomla, Drupal etc. with items and subitems... My question is: do you know of any tutorials or texts abut implementing such a structure. I've tried the recursion thinggy with while getting children's IDs move downwards from the parent while searching for the currently displayed item's ID. I've tried also the Drupalish way with having a path parameter enclosing ID's all the way from top to bottom '1/23/123/3'. But all in all it was just too chaotic - code something, try it out. If you have some idea on this topic - thanks in advice.

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• How to convert "9:00 PM EST" to a Date object

  - by Bara

  I am developing an Android application and require some basic datetime manipulation. I have a Date object (from Java.util.Date) holding a specific date. I need to add a specific time to it. The time I have is a string in this format: "9:00 PM EST" How would I "add" this time to the previous date? If the Date object currently has: "4/24/10 00:00:00" How would I change it to instead be: "4/24/10 09:00:00 EST" I would prefer to do this without the use of an external library, if possible.

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• best way to build iphone settings screen

  - by Christian Schlensker

  I'm building a settings screen for an iPhone app and it is supposed to resemble a grouped table view. Each "cell" should behave like a button. Most cells just have a image view, label view, and disclosure indicator. One will display a value in addition to a label. All of these buttons will present a new view when tapped. Now, how to implement this? I was considering just laying out a set of buttons with custom background images, or would it be best to just use a table view. If that's the case what should it be implemented. So far I've only used table views to display some kind of dynamic data in which each cell displayed the same basic detail view. I'm most curious to figure out how to setup cellForRowAtIndexPath. Would this contain some sort of switch statement to configure each cell individually, or is there an easier way to handle all this?

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• How JSF2.0 binds Managed Beans with xhtml?

  - by rahul_d_m

  i have very basic question about How JSF2.0 binds Managed Beans with xhtml? say i have inputtext with value="#{MymanagedBean.property}" how this MymanagedBean reference is resolved in JSF 2 ? please consider following points while answering. in ealier version i.e. with JSF 1.2 we have to write binding in faces-config.xml but with JSF 2 it is not mandatory to have faces-config.xml if you do view source of xhtml pages.. you will not find anywhere MymanagedBean reference. then how it is done?

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• Key logger wont record key strokes without console

  - by Daniel Gopar

  I created a small basic key logger in C++. For some reason when I compile and run the program with the console displayed, it will record every key stroke I make in whatever program I am using such as a browser and store it in a text file. However when I make it so that it WON'T display a console window, it will not record anything and it's just a process in the background doing nothing. Here is the link to my code: http://pastebin.com/4wqQyLJ9 The function that is giving me trouble with hiding the console, is the Stealth() function. Any suggestions, tips or hints will be helpful. Thanks.

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• How to retain focus on an editable html after deleting an element.

  - by Lukasz

  Hello, I have a website with design mode on (aka. content editable = true) with some basic text on it. To that site I hooked up a shortcut so that at any point in the text I can insert an input box that serves me as an autocomplete. For that input however I want it to disappear right after I hit ENTER so that I can continue typing. It is an easy task to just make the input box disappear but I always loose focus from my document. I would greatly appreciate any suggestions on how to make this work?

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• Tips for improving performance of DB that is above size 40 GB (Sql Server 2005) and growing monthly

  - by HotTester

  The current DB or our project has crossed over 40 GB this month and on an average it is growing monthly by around 3 GB. Now all the tables are best normalized and proper indexing has been used. But still as the size is growing it is taking more time to fire even basic queries like 'select count(1) from table'. So can u share some more points that will help in this front. Database is Sql Server 2005. Further if we implement Partitioning wouldn't it create a overhead ? Thanks in advance.

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• WPF InotifyPropertyChanged and view models

  - by Joel Barsotti

  So I think I'm doing something pretty basic. I know why this doesn't work, but it seems like there should be a straight foward way to make it work. code: private string fooImageRoot; // .... public BitmapImage FooImage { get { URI imageURI = new URI(Path.Combine(fooImageRoot, CurrentFooTypes.FooObject.FooImageName)); return imageURI; } } So CurrentFOoTypes and FooObject also supports INotifyPropertyChanged. So If I bind a TextBlock to CurrentFooTypes.FooObject.FooImageName, if either fooObject or FooImageName change the textblock updates. How can I subscribe my viewmodel object to recieve updates in a similiar fasion.

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• Alternatives to UIWebView for rich content?

  - by ojreadmore

  In my app, I am displaying 4 "tabs", each are local content through a UIWebView. I create HTML markup from my simple data. This is slow to load and I'm trying to speed it up. I'm using UIWebView to accomplish these: 1. hyperlinks 2. some styling - font colors 3. HTML tables Writing my own class to handle this is okay for (1.) hyperlinks - I can use a touch event to call a method. And (2.) styling - I can use UILables to do basic formatting, no biggie here. BUT what I really love about the UIWebViews is the (3.) HTML tables! I find it troublesome to line up the UILabels in a way that mimics HTML Tables, for instance, one cell's height in a row changes the height of all cells. I'm looking for another perspective or knowledge of an alternative.

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