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• MVC helper functions business logic

  - by Menelaos Vergis

  I am creating some helper functions (mvc.net) for creating common controls that I need in almost every project such as alert boxes, dialogs etc. If these do not contain any business logic and it's just client side code (html, js) then it's ok. My problem arises when I need some business logic behind this helper. I want to create a 'rate my (web) application' control that will be visible every 3 days and the user may hide it for now, navigate to rate link or hide it for ever. To do this I need some sort of database access and a code that acts as business logic. Normally I would use a controller for this, with my DI and everything, but I don't know where to put this code now. This should be placed in the helper function or in a controller that responds objects instead of ActionResults?

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• GNU Octave - question about graphs and plotting

  - by Twórca

  I've had task to do - to make an graphical interpretation of adding two functions together: sin(8x) and multiplied -sign(x) in Octave, as shown on image above. And I've done that, but I don't know how to get rid of these lines, which link up gaps between separated values (for example, -1 and 1). I don't want them to be seen especially in third graph. To make helping me easier, I'm going to tell you what I did: I made linear series of numbers, from -100 to 99 (tempx). tempy = -sign(tempx) y1 = [tempy tempy tempy tempy] (this line is kinda funny, if you know Polish language) Creating y2 - sinus function y3 = y2 + y1 Plotting, subplotting... Screenshot Awaiting for instructions...

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• Is it possible to power up ports on a USB hub from Ubuntu?

  - by James Henstridge

  I have a D-Link DUB-H7 powered USB 2.0 hub connected to my computer. Occasionally when I reboot the system, I've noticed that some of the ports on the hub get powered down: the green light next to the port is turned off, and the device attached to that port is not visible to lsusb or similar commands. Devices attached to the other ports on the hub function as normal. I am able to restore the ports by disconnecting power to the hub temporarily (from the computer, AC adapter and any devices that might provide any power such as my phone), but this is a bit of a hassle. It seems like something that might be related to power management, so is there some way you can tell the USB hub to power up through software?

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• Burned DVD essentially has no content and the DVD is not bootable when creating on Mac OSX

  - by Tom Winans

  I have been unsuccessful when burning downloaded ISOs to a DVD on OSX - the burned DVD essentially has no content and the DVD is not bootable. I've tried Ubuntu versions of 11.x and 12.04 with no success. Further, I took the DVD out of an Ubuntu Unleashed book (v11.x), and am unable on several OSX laptops to read the DVD. The applications to manage ISO disks on OSX are really straightforward, and they properly function with ISOs of other linux distributions. Is there a problem with Ubuntu's? Or is it just me?

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• distribution update made my close/minimize/maximize window buttons diappear

  - by Marc Sauvageau

  I am running an ubuntu/gnome3 environment. While running the upgrade manager on 12.04, I was informed that there was a distribution update but that it was partial. (whatever that means) After a few failed attempts at updating through the manager, I decide to run sudo apt-get update && sudo apt-get update. The updates seem to work however, the close/maximize/minimize buttons of all windows have disappeared. I also can no longer use the Alt+Tab function. I tried to post an image but I need more rep (sorry) I have tried to run the updates again but nothing changes. I'm still very new at this. I would appreciate it if you could use simple terms to describe or ask questions. Thanks in advance!

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• What is your most unusual javascript concept you've ever seen ?

  - by Cybrix

  Hi, I've learned javascript at school but since I'm working with it and study about it every day, I've found very particular aspect of javascript that I didn't know about. Which at first, was very hard to understand for me and finally, I found it very usefull and easy to implement. And in the final, it gives to my code some kind of "beauty". An example I've once seen: function getter( input ) { result = { foo1 : 'bar1', foo2 : 'bar2', foo3 : 'bar3' }[input] || input || "default"; return result; } Do you guys have other examples of particular use you make of Javascript ? Thank you PS: I use the term particular use because it might be unusual for any Javascript beginner. I believe this question is most likely to belong to the community wiki.

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• Is chess-like AI really inapplicable in turn-based strategy games?

  - by Joh

  Obviously, trying to apply the min-max algorithm on the complete tree of moves works only for small games (I apologize to all chess enthusiasts, by "small" I do not mean "simplistic"). For typical turn-based strategy games where the board is often wider than 100 tiles and all pieces in a side can move simultaneously, the min-max algorithm is inapplicable. I was wondering if a partial min-max algorithm which limits itself to N board configurations at each depth couldn't be good enough? Using a genetic algorithm, it might be possible to find a number of board configurations that are good wrt to the evaluation function. Hopefully, these configurations might also be good wrt to long-term goals. I would be surprised if this hasn't been thought of before and tried. Has it? How does it work?

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• D3D9 Alpha Blending on the surfaces

  - by Indeera

  I have a surface (OffScreenPlain or RenderTarget with D3DFMT_A8R8G8B8) which I copy pixels (ARGB) to, from a third party function. Before pixel copying, Bits are accessed by LockRect. This surface is then StretchRect to the Backbuffer which is (D3DFMT_A8R8G8B8). Surface and Backbuffer are different dimensions. Filtering is set to D3DTEXF_NONE. Just after creating the d3d device I've set following RenderState settings D3DRS_ALPHABLENDENABLE -> TRUE D3DRS_BLENDOP -> D3DBLENDOP_ADD D3DRS_SRCBLEND -> D3DBLEND_SRCALPHA D3DRS_DESTBLEND -> D3DBLEND_INVSRCALPHA But I see no alpha blending happening. I've verified that alpha is specified in pixels. I've done a simple test by creating a vertex buffer and drawing a triangle (DrawPrimitive) which displays with alpha blending. In this test surface was StretchRect first and then DrawPrimitive, and the surface content displays without alpha blending and the triangle displays with alpha blending. What am I missing here? Thanks

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• Can't disable Alt + mouse buttons combinations

  - by Andrey

  I've already searched through the questions, and didn't find the same question as I want to ask. I'm working in blender and there are some combinations that I am used to and remapping them in blender would be the last resort, not the first. I have tried to disable Alt+LMB and Alt+RMB actions in ccsm, I've tried to do this in dconf or gconf editors as well, but nothing helped. As soon as I close the editors or get back to the main screen of ccsm, these combinations are enabled again. So, for example, instead of selecting an edge loop in blender with Alt+RMB, I get this goddamn menu offering me to move the window to another workspace, etc. I really don't need this function, so I'd rather switch it off instead of remapping the hotkeys I'm used to in blender.

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• Bouncing ball slowing down over time

  - by user46610

  I use the unreal engine 4 to bounce a ball off of walls in a 2D space, but over time the ball gets slower and slower. Movement happens in the tick function of the ball FVector location = GetActorLocation(); location.X += this->Velocity.X * DeltaSeconds; location.Y += this->Velocity.Y * DeltaSeconds; SetActorLocation(location, true); When a wall gets hit I get a Hit Event with the normal of the collision. This is how I calculate the new velocity of the ball: FVector2D V = this->Velocity; FVector2D N = FVector2D(HitNormal.X, HitNormal.Y); FVector2D newVelocity = -2 * (V.X * N.X + V.Y * N.Y) * N + V; this->Velocity = newVelocity; Over time, the more the ball bounced around, the velocity gets smaller and smaller. How do I prevent speed loss when bouncing off walls like that? It's supposed to be a perfect bounce without friction or anything.

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• Playing part of a sfx audio file in HTML5 using WebAudio

  - by Matthew James Davis

  I have compiled all of my sound effects into one sequenced .ogg file. I have the start and stop times for each sound effect. How do I play the individual effects? That is, how do I play part of an audio file. More specificially, I've created a dictionary { 'sword_hit': { src: 'sfx.ogg', start: 265, // ms length: 212 // ms } } that my play_sound() function can use to look up 'sword_hit' and play the correct audio file at the correct start time for the correct duration. I simply need to know how to tell the WebAudio API to start playing at start ms and only play for length ms.

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• How to block FeedReader from fetching my content to their site?

  - by Wei Kai

  As you all can see from the picture below, my site's content is duplicated by FeedReader and indexed at Google. When I clicked at the FeedReader link, it uses some sort of iFrame to draw content from my site live. This forms some sort of content duplication to me, and I believe it does harm to my site. (Stackoverflow doesn't allow me to post image due to new account, pls click at the link above to see the picture, million thanks to you.) What can I do to prevent Feedreader to fetch my content to their site? I know robots.txt can perform such function, but I don't know how to do it. Any help would be much appreciated. I have also highlighted this issue to FeedReader 2 days ago, but yet to get any reply from them.

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• How can I improve my Animation

  - by sharethis

  The first approaches in animation for my game relied mostly on sine and cosine functions with the time as parameter. Here is an example of a very basic jump I implemented. if(jumping) { height = sin(time); if(height < 0) jumping = false; // player landed player.position.z = height; } if(keydown(SPACE) && !jumping) { jumping = true; time = now(); // store the starting time } So my player jumped in a perfect sine function. That seems quite natural, because he slows down when he reached the top position, and in the fall he speeds up again. But patching every animation out of sine and cosine is stretched to its limits soon. So can I improve my animation and provide a more abstract layer?

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• Write own messaging system vs. utilize existing ones

  - by A.Rashad

  We are trying to have our own startup, with a middleware application to glue small applications with enterprise legacy systems. for such middle-ware to function properly, we will need some sort of messaging system to make different components talk to each other in a reliable way. the alternatives are: use an existing messaging system, such as 0MQ, jBOSS, WebSphere MQ, etc. build our own messaging system the way we see the problem I am more biased towards the later option for the following reasons: to have more control over our final product to avoid any licensing problems later on to learn about messaging while writing the code to invent something new, that might cost us lots of $$$ if reused an existing system What would you do if in my shoes?

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• When Googlebot sees a link, will it click it or navigate to it?

  - by FakeRainBrigand

  My site uses pushState and JSON data to display content. So, for example, this might appear on my page: <a href="/some/page">some page</a> The JavaScript then prevents the default action (following the link), and instead renders a view (using a different api, such as /getjson?some_page). $('[href]').click(function(){ history.pushState(...); handleURL(...); }); Assume my server will respond to requests at /some/page with a pre-rendered version. My questions are: will Googlebot receive the prerendered version, or allow JavaScript to instead invoke pushState, etc. if it doesn't make the direct request, will it wait for AJAX content to be loaded? does Googlebot implement pushState, so it will show the proper URL in search results?

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• Named arguments (parameters) as a readability aid

  - by Damian Mehers

  A long time ago I programmed a lot in ADA, and it was normal to name arguments when invoking a function - SomeObject.DoSomething(SomeParameterName = someValue); Now that C# supports named arguments, I'm thinking about reverting to this habit in situations where it might not be obvious what an argument means. You might argue that it should always be obvious what an argument means, but if you have a boolean argument, and callers are passing in "true" or "false" then qualifying the value with the name makes the call site more readable. contentFetcher.DownloadNote(note, manual : true); I guess I could create Enums instead of using true or false (Manual, Automatic in this case). What do you think about occasionally using named arguments to make code easier to read?

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• Deterministic Multiplayer RTS game questions?

  - by Martin K

  I am working on a cross-platform multiplayer RTS game where the different clients and a server(flash and C#), all need to stay deterministically synchronised. To deal with Floatpoint inconsistencies, I've come across this method: http://joshblog.net/2007/01/30/flash-floating-point-number-errors/#comment-49912 which basically truncates off the nondeterministic part: return Math.round(1000 * float) / 1000; Howewer my concern is that every time there is a division, there is further chance of creating additional floatpoint errors, in essence making it worse? . So it occured to me, how about something like this: function floatSafe(number:Number) : Number {return Math.round(float* 1024) / 1024; } ie dividing with only powers of 2 ? What do you think? . Ironically with the above method I got less accurate results: trace( floatSafe(3/5) ) // 0.599609375 where as with the other method(dividing with 1000), or just tracing the raw value I am getting 3/5 = 0.6 or Maybe thats what 3/5 actually is, IE 0.6 cannot really be represented with a floatpoint datatype, and would be more consistent across different platforms?

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• Redirecting non existing post to homepage; is that good for SEO?

  - by BlackEagle

  I am checking my website out on Google Webmasters and I am seeing an astonishing 5000 links that could not be found by Google's Crawlers. That's normal, because my website is built in a manner that users can drop their own things, which also lead to 404 pages. Not a problem at all if I can find a workaround of course... So my question is: what if I made a function or a mod rewrite that will check if the link exists (a post for example) and if not, it will redirect it to the home page. Is this good for SEO? Will Google see this as 'link found'? How do I have to look at this problem?

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• Trace code pascal [on hold]

  - by mghaffari

  I haven't worked with Pascal so far, and my problem is understanding the recursive aspects that prm assignment operators and how the final (correct) value is derived. Would someone please explain that line for me. Program test(output); FUNCTION prm(az:integer) : real; begin if az = 1 then prm := sqrt(12) else prm := sqrt(12*prm(az-1)); end; begin writeln(prm(30):0:2); end.

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• How do I customize Alt+Tab behaviour?

  - by David Oneill

  GOAL: I would like to make the little menu that pops up when I press Alt+Tab to gain the ability to jump to a particular window by pointing my mouse at one of the icons. This is the behaviour that my Mac OSX laptop has. The Situation I use Xfce, with the default windows manager (XFwm). I currently have Ubuntu 10.04 and 11.10, although I plan on updating both to XUbuntu 12.04 once the dust settles (probably mid-may?). (Clarification, for my current setup, I installed Ubuntu, then added xfce manually after the fact). So, a series of related questions. How do I set this up? (If this is not possible, please answer the following questions to help me learn) Is the Alt+Tab a function of the desktop environment, or the windows manager, or some other piece? (IE if I switch to using some other tool, could I potentially get this) Are there any customizations that are available either from settings or add-on applications that would allow me to change the behaviour of that menu?

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• Why do some opensouce libraries lack comments?

  - by entropy

  I don't know if this happens to most Opensource libraries, but many of I know and use (for example OpenSSL, Webkit, ...) they all lack comments, or contain very few comments. Not to mention their very few documents, it is hard to read their source code. We can hardly understand what a member variable means, or what this function does. This seems to be against coding standard practice Why is that? How can people collaborate to these opensource with very few comments?

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• How can I map the docky anchor button so that it will launch the unity dash?

  - by user76179

  Example of a Docky Dock I have the Docky dock on my desktop. It has an anchor logo button (as seen on the left side image of the link above) that brings up the Docky settings. I want to map it so that it opens my dash instead. I believe I can do this through gconf and by setting the docky button to either my super key or the necessary path required to open the dash function (but I do not know this path or how to code a button to a keyboard key). How can I map the docky anchor button so that it will launch the unity dash (as similar to when you simply tap the super key)?

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• (int) Math.floor(x / TILESIZE) or just (int) (x / TILESIZE)

  - by Aidan Mueller

  I have a Array that stores my map data and my Tiles are 64X64. Sometimes I need to convert from pixels to units of tiles. So I was doing: int x int y public void myFunction() { getTile((int) Math.floor(x / 64), (int) Math.floor(y / 64)).doOperation(); } But I discovered by using (I'm using java BTW) System.out.println((int) (1 / 1.5)) that converting to an int automatically rounds down. This means that I can replace the (int) Math.floor with just x / 64. But if I run this on a different OS do you think it might give a different result? I'm just afraid there might be some case where this would round up and not down. Should I keep doing it the way I was and maybe make a function like convert(int i) to make it easier? Or is it OK to just do x / 64?

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• Wammu, Samsung J700 error GetNextMemory code: 56

  - by Tamas

  I have got a (old) Samsung J700i. When connecting with a USB cabel to Wammu first the access was denied. Now it is oké... However, when I try to get info out from the phone... I get error message: Error whlie communicating with phone Desciption: Internal phone error. Function: GetNextMemory Error code: 56 I am using Ubuntu 12.04 and Wammu 0.36 Running on Python 2.7.3 Using wxPython 2.8.12.1 Using python-gammu 1.31.0 and Gammu 1.31.0 How may I access data on the phone? Thanks, Tamas

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• How to get useful feedback/bug reports from users

  - by Mikael Eliasson

  I'm sure most webmasters have recived a mail like this: Creating [insert item here] is not working! When you check it out there is no general problem with the function but rather the user has discovered an edge case. Almost every mail I get is like this and in the long run it gets a bit annoying to always have to ask the user for more information. Is there anything I can do to get my users provide more useful feedback? Right now I have a mailto: for the webmaster mail in the page footer. I was thinking of changing this so that they have to report through a form on the site. Anyone got any experience with this? Do you get better/more reports by having a feedback form instead of giving the users the email?

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