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  • How do you Access an Authenticated Google App Engine Service with Ruby?

    - by viatropos
    I am trying to do this same thing here but with Ruby: Access Authenticated GAE Client with Python. Any ideas how to retrieve authenticated content from GAE with Ruby? I am using the Ruby GData Gem to access everything in Google Docs and such and it's making life very easy, but now I'd like to access things on GAE that require admin access, programmatically, and it doesn't support that. Here's what I'm getting (using DocList, not sure what to use yet): c = GData::Client::DocList.new c.clientlogin(username, password, nil, nil, nil, "HOSTED") c => #<GData::Client::DocList:0x201bad8 @clientlogin_service="writely", @version="2", @auth_handler=#<GData::Auth::ClientLogin:0x200803c @account_type="HOSTED", @token="long-hash", @auth_url="https://www.google.com/accounts/ClientLogin", @service="writely">, @source="AnonymousApp", @headers={"Authorization"=>"GoogleLogin auth=long-hash", "User-Agent"=>"GoogleDataRubyUtil-AnonymousApp", "GData-Version"=>"2", "Content-Type"=>"application/atom+xml"}, @authsub_scope="http://docs.google.com/feeds/", @http_service=GData::HTTP::DefaultService> url = "http://my-cdn.appspot.com/files/restricted-file.html" c.get(url) => #<GData::HTTP::Response:0x20004b8 @status_code=302, @body="", @headers={"connection"=>"close", "date"=>"Sun, 11 Apr 2010 00:30:20 GMT", "content-type"=>"text/html", "server"=>"Google Frontend", "content-length"=>"0", "location"=>"https://www.google.com/accounts/ServiceLogin service=ah&continue=http://my-cdn.appspot.com/_ah/login%3Fcontinue%3D http://my-cdn.appspot.com/files/restricted-file.html& ltmpl=gm&ahname=My+CDN&sig=a-signature"}> Any tips? That other SO question pointed to doing something with the redirect... Not sure how to handle that. Just looking for a point in the right direction from the ruby experts. Thanks.

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  • Finding distance to the closest point in a point cloud on an uniform grid

    - by erik
    I have a 3D grid of size AxBxC with equal distance, d, between the points in the grid. Given a number of points, what is the best way of finding the distance to the closest point for each grid point (Every grid point should contain the distance to the closest point in the point cloud) given the assumptions below? Assume that A, B and C are quite big in relation to d, giving a grid of maybe 500x500x500 and that there will be around 1 million points. Also assume that if the distance to the nearest point exceds a distance of D, we do not care about the nearest point distance, and it can safely be set to some large number (D is maybe 2 to 10 times d) Since there will be a great number of grid points and points to search from, a simple exhaustive: for each grid point: for each point: if distance between points < minDistance: minDistance = distance between points is not a good alternative. I was thinking of doing something along the lines of: create a container of size A*B*C where each element holds a container of points for each point: define indexX = round((point position x - grid min position x)/d) // same for y and z add the point to the correct index of the container for each grid point: search the container of that grid point and find the closest point if no points in container and D > 0.5d: search the 26 container indices nearest to the grid point for a closest point .. continue with next layer until a point is found or the distance to that layer is greater than D Basically: put the points in buckets and do a radial search outwards until a points is found for each grid point. Is this a good way of solving the problem, or are there better/faster ways? A solution which is good for parallelisation is preferred.

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  • XNA 2D mouse picking

    - by Corndog
    I'm working on a simple 2D Real time strategy game using XNA. Right now I have reached the point where I need to be able to click on the sprite for a unit or building and be able to reference the object associated with that sprite. From the research I have done over the last three days I have found many references on how to do "Mouse picking" in 3D which does not seem to apply to my situation. I understand that another way to do this is to simply have an array of all "selectable" objects in the world and when the player clicks on a sprite it checks the mouse location against the locations of all the objects in the array. the problem I have with this approach is that it would become rather slow if the number of units and buildings grows to larger numbers. (it also does not seem very elegant) so what are some other ways I could do this. (Please note that I have also worked over the ideas of using a Hash table to associate the object with the sprite location, and using a 2 dimensional array where each location in the array represents one pixel in the world. once again they seem like rather clunky ways of doing things.)

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  • Cross-platform game development: ease of development vs security

    - by alcuadrado
    Hi, I'm a member and contributor of the Argentum Online (AO) community, the first MMORPG from Argentina, which is Free Software; which, although it's not 3D, it's really addictive and has some dozens of thousands of users. Really unluckily AO was developed in Visual Basic (yes, you can laugh) but the former community, so imagine, the code not only sucks, it has zero portability. I'm planning, with some friends to rewrite the client, and as a GNU/Linux frantic, want to do it cross-platform. Some other people is doing the same with the server in Java. So my biggest problem is that we would like to use a rapid development language (like Java, Ruby or Python) but the client would be pretty insecure. Ruby/Python version would have all it's code available, and the Java one would be easily decompilable (yes, we have some crackers in the community) We have consider the option to implement the security module in C/C++ as a dynamic library, but it can be replaced with a custom one, so it's not really secure. We are also considering the option of doing the core application in C++ and the GUI in Ruby/Python. But haven't analysed all it's implications yet. But we really don't want to code the entire game in C/C++ as it doesn't need that much performance (the game is played at 18fps on average) and we want to develop it as fast as possible. So what would you choose in my case? Thank you!

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  • Issues with Rails, Amazon S3, and protected URLs

    - by Shpigford
    So I followed this little tutorial about protecting downloads of files that are uploaded to Amazon S3 with Paperclip. When I've developed locally, it's worked fine, but since pushing the exact same code to a production server...I now get this error from Amazon when I try to access the files: <Error> <Code>InvalidArgument</Code> <Message>Either the Signature query string parameter or the Authorization header should be specified, not both</Message> <ArgumentValue>Basic dGVjaHVrdWxlbGU6ZWxlbHVrdWhjZXQ=</ArgumentValue> <ArgumentName>Authorization</ArgumentName> <RequestId>F6E455857C54F95A</RequestId> <HostId>X4QA2pw9wpHtJtJ2T8qxCyINjq4PLHQVF4VrlYjpX7Ayh694BgQprh5p8H7NRCAt</HostId> </Error> Example URL: http://s3.amazonaws.com/media.example.com/assets/videos/1/original.mov?AWSAccessKeyId=MY_ACCESS_KEY&Expires=1271972624&Signature=7wWH2WYHPO0o9szwPJbimUMqAig%3D That URL is generated using AWS::S3::S3Object.url_for using the aws-s3 gem. So...not even sure where to start. The fact that it works fine when the app is running locally but not when in production really doesn't make sense. The production server is running Ubuntu 8.04.4 LTS (Hardy).

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  • I am Unable to Post Xml to Linkedin Share API

    - by Vijesh V.Nair
    I am using Delphi 2010, with Indy 10.5.8(svn version) and oAuth.pas from chuckbeasley. I am able to collect token with app key and App secret, authorize token with a web page and Access the final token. Now I have to post a status with Linkedin’s Share API. I am getting a unauthorized response. My request and responses are giving bellow. Request, POST /v1/people/~/shares HTTP/1.0 Content-Encoding: utf-8 Content-Type: text/xml; charset=us-ascii Content-Length: 999 Authorization: OAuth oauth_consumer_key="xxx",oauth_signature_method="HMAC-SHA1",oauth_timestamp="1340438599",oauth_nonce="BB4C78E0A6EB452BEE0FAA2C3F921FC4",oauth_version="1.0",oauth_token="xxx",oauth_signature="Pz8%2FPz8%2FPz9ePzkxPyc%2FDD82Pz8%3D" Host: api.linkedin.com Accept: text/html, */* Accept-Encoding: identity User-Agent: Mozilla/3.0 (compatible; Indy Library) %3C%3Fxml+version=%25221.0%2522%2520encoding%253D%2522UTF-8%2522%253F%253E%253Cshare%253E%253Ccomment%253E83%2525%2520of%2520employers%2520will%2520use%2520social%2520media%2520to%2520hire%253A%252078%2525%2520LinkedIn%252C%252055%2525%2520Facebook%252C%252045%2525%2520Twitter%2520%255BSF%2520Biz%2520Times%255D%2520http%253A%252F%252Fbit.ly%252FcCpeOD%253C%252Fcomment%253E%253Ccontent%253E%253Ctitle%253ESurvey%253A%2520Social%2520networks%2520top%2520hiring%2520tool%2520-%2520San%2520Francisco%2520Business%2520Times%253C%252Ftitle%253E%253Csubmitted-url%253Ehttp%253A%252F%252Fsanfrancisco.bizjournals.com%252Fsanfrancisco%252Fstories%252F2010%252F06%252F28%252Fdaily34.html%253C%252Fsubmitted-url%253E%253Csubmitted-image-url%253Ehttp%253A%252F%252Fimages.bizjournals.com%252Ftravel%252Fcityscapes%252Fthumbs%252Fsm_sanfrancisco.jpg%253C%252Fsubmitted-image-url%253E%253C%252Fcontent%253E%253Cvisibility%253E%253Ccode%253Eanyone%253C%252Fcode%253E%253C%252Fvisibility%253E%253C%252Fshare%253E Response, HTTP/1.1 401 Unauthorized Server: Apache-Coyote/1.1 x-li-request-id: K14SWRPEPL Date: Sat, 23 Jun 2012 08:07:17 GMT Vary: * x-li-format: xml Content-Type: text/xml;charset=UTF-8 Content-Length: 341 Connection: keep-alive <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <error> <status>401</status> <timestamp>1340438838344</timestamp> <request-id>K14SWRPEPL</request-id> <error-code>0</error-code> <message>[unauthorized]. OAU:xxx|nnnnn|*01|*01:1340438599:Pz8/Pz8/Pz9ePzkxPyc/DD82Pz8=</message> </error> Please help. Regards, Vijesh Nair

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  • Empty UIView with minimal drawRect: overhead

    - by Benjohn Barnes
    Hi, I have an application that has three nested views that are mechanically important, but have no visual elements: A vanila UIView that doesn't have any content of its own, and is simply used as a host for CALayers. A UIScrollView (that is queried for it's origin and used to position CALayers in 3d: I really only use this view to faithfully replicate the scroll view's "mechanics"), The scroll view's contents: a UIView subclass. It simply picks up touch events and passes them to a delegate - all that is important are its UIResponder machinery. The UIView hosting CALayers is a sibling of a UIImageView that is a background image over which the CALayers are drawn. I'd really like to ensure that none of these empty UIViews have any drawing or compositing overhead (in time, or storage) associated with them, or if that's not possible, to get this overhead as small as possible, and to understand it so that I can perhaps decide if I should try a different approach. In interface builder, I've set all of the views to not clear their context before drawing. I've not set them to be opaque though, because they definitely are not opaque - they are completely transparent. I've found that I need to give the scroll view contents a transparent clear colour (again in IB by setting the background colour's opacity to zero), and this suggests that it is being drawn, which I don't want. So, in short, I've not got much idea of what is and isn't getting drawn (anyone know of a tool like Quartz Debug for iPhone / simulator?), or how to go about stopping things from getting drawn. Advice would be very welcome! Thanks, Benjohn

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  • Textured Primitives in XNA with a first person camera

    - by 131nary
    So I have a XNA application set up. The camera is in first person mode, and the user can move around using the keyboard and reposition the camera target with the mouse. I have been able to load 3D models fine, and they appear on screen no problem. Whenever I try to draw any primitive (textured or not), it does not show up anywhere on the screen, no matter how I position the camera. In Initialize(), I have: quad = new Quad(Vector3.Zero, Vector3.UnitZ, Vector3.Up, 2, 2); quadVertexDecl = new VertexDeclaration(this.GraphicsDevice, VertexPositionNormalTexture.VertexElements); In LoadContent(), I have: quadTexture = Content.Load<Texture2D>(@"Textures\brickWall"); quadEffect = new BasicEffect(this.GraphicsDevice, null); quadEffect.AmbientLightColor = new Vector3(0.8f, 0.8f, 0.8f); quadEffect.LightingEnabled = true; quadEffect.World = Matrix.Identity; quadEffect.View = Matrix.CreateLookAt(cameraPosition, cameraTarget, Vector3.Up); quadEffect.Projection = this.Projection; quadEffect.TextureEnabled = true; quadEffect.Texture = quadTexture; And in Draw() I have: this.GraphicsDevice.VertexDeclaration = quadVertexDecl; quadEffect.Begin(); foreach (EffectPass pass in quadEffect.CurrentTechnique.Passes) { pass.Begin(); GraphicsDevice.DrawUserIndexedPrimitives<VertexPositionNormalTexture>( PrimitiveType.TriangleList, quad.Vertices, 0, 4, quad.Indexes, 0, 2); pass.End(); } quadEffect.End(); I think I'm doing something wrong in the quadEffect properties, but I'm not quite sure what.

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  • Knight's tour / recursion

    - by Layne
    Hey, I'm trying to learn a little bit more about recursion but somehow I can't solve the knight's tour and I'm hoping someone can point out my logic error. public class main { static int fsize = 5; static int board[][] = new int[fsize][fsize]; static int[] sprung_x = {1,2,2,1,-1,-2,-2,-1}; static int[] sprung_y = {-2,-1,1,2,2,1,-1,-2}; static void SucheWeg(int schrittnummer, int x, int y) { board[x][y] = schrittnummer; if( schrittnummer == ((fsize*fsize)-1)) { for(int i = 0; i<fsize; i++) { for(int c=0; c<fsize; c++) { System.out.printf("%3d", board[i][c]); } System.out.println("\n"); } } else { for(int i = 0; i<8; i++) { for(int c = 0; c<8; c++) { if( (x+sprung_x[i]) >= 0 && (x+sprung_x[i]) < fsize && (y+sprung_y[c]) >= 0 && (y+sprung_y[c]) < fsize ) { if(board[x+sprung_x[i]][y+sprung_y[c]] == -1) { System.out.println("Move: "+schrittnummer + "\n"); SucheWeg(schrittnummer+1, (x+sprung_x[i]), (y+sprung_y[c])); } } } } board[x][y] = -1; } } public static void main(String[] args) { System.out.println("Begin: \n"); for(int i = 0; i<fsize; i++) { for(int c = 0; c<fsize; c++) { board[i][c] = -1; } } SucheWeg(0, 0, 0); System.out.println("\nEnd"); } }

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  • Are we DELPHI, VCL or Pascal programmers?

    - by José Eduardo
    i´ve been a delphi database programmer since D2. Now i´m facing some digital imaging and 3D challenges that make me to start study OpenGL, DirectX, Color Spaces and so on. I´m really trying but nobody seems to use Delphi for this kind of stuff, just the good-old-paycheck Database programming. ok, i know that we have some very smart guys behind some clever components, some of this open-source. Is there any PhotoShop, Blender, Maya, Office, Sonar, StarCraft, Call of Dutty written in Delphi? Do i have to learn C++ to have access to zillions of books about that kind of stuff? What is the fuzz/hype behind this: int *varName = &anhoterThing? Why pointers seems to be the holy graal to this apps? I´ve downloaded MSVC++ Express and start to learn some WPF and QT integration, and i think: "Man, Delphi does this kind of stuff, with less code, less headaches, since the wheels were invented" This lead my mind to the following... Do you ever tried to write a simple notepad program using just notepad and dcc32 in Pascal/Delphi? if so embarcadero could make our beloved pascal compiler free, and sell just the ide, the vcl, the customer support ... and back to the question: Are we DELPHI, VCL or Pascal programmers?

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  • Bringing ideas to life

    - by danixd
    I understand that this forum is filled with computer science genius's but there must come a point where your expertise in coding can not keep up with your creativity. I am a front end programmer and designer of sorts. I have so many ideas, with no ways of implementing them. I know of platforms that can help, I am really into the arduino project for physical ideas and I know Flash is an amazing platform for software, but when it comes to complex ideas, even such as a 3D game, things can be too much to handle individually. When you have an idea, what is your typical methodology of bring them to life? Write down the idea, save if for later (never gets made right...) Try building it yourself, on the platforms you work with and are good at Consult people on what platform it is best suited to and collaborate with an expert in that field to do the dirty work Consult people on what platform it is best suited to and try to learn it and make it yourself (at least the alpha stages) Are there any communities that support this idea of bringing things to life? Can you pitch ideas to x company as a business model and hope they take you on / sponsor you? Do you have to spend lots of $$$ to get things made?

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  • Good Learning Method for Objective-C?

    - by Josh Kahane
    Hi I know this must be asked a millions times and can't be easy to answer as there is o definitive method, but any help would be appreciated, thanks. I have been playing around with all sorts of things in Xcode and with Objective-C, however I can't seem to find a good way of learning things in an efficient way. I have bought the book 'Programming in Objective-C 2.0' and its great but just lays down the basics it seems. I want to learn in the 2D game development direction, then of course 3D after nailing that, if thats the right thing to do? I am 17 currently in year 13, last year of school/A Levels and am almost definitely taking a gap year. Any good, well known reputable courses online or offline (real world)? This is my first programming language, and I am absolutely serious about learning this. One last question, is when learning things online, I have in the past started building a feature and learning a certain aspect in programming only to find out after adding more its slows down the app or its to inefficient. Is the key to use a certain method in a certain situation (being os many ways to do the same thing) or use any of those methods and refine it in your app to make it run smoothly? Sorry, its hard for me to know when I have little experience, thus far. Sorry for rambling on! I would appreciate any help, thank you!

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  • Prototype VS jQuery

    - by aSeptik
    Hi All guys! First of, thank's for your time; then i want go directly to the point by saying that, i don't want to open another "Yet Another Js VS Js" 3d , the web is almost busy of this! I want also make a premise, i have used both theese js frameworks and i love it and i know, that there are a lot of good js frameworks around, maybe better then this two; but, as you know we need to be perfomant and quickly by doing our works, so i want keep this two, that are the most famous and therefore have a great community support! now, if you are going to say me, that the choise depends on what i'm going to do!? then i can think, hey, in the end they are both javascript and they have almost the same methods and functions and for achieve a task they needs almost the same lines of code! So i want hear from you guys, from you that have really used one of theese, for a real Rich Internet Application what are the real points of force and what the weaknesses you find!? Regards.

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  • Help with animating an element in jQuery

    - by alex
    I have an unordered list with a few list elements. #tags { width: 300px; height: 300px; position: relative; border: 1px solid red; list-style: none none; } #tags li { position: absolute; background: gray; } I have also started writing a jQuery plugin to animate the list elements. So far, I place the list elements randomly in the parent container, and choose a random font size for the text. My next step (which I am a bit stuck on) is to animate the list elements... essentially, I want the list elements to do something like this Slide from left to right whilst getting slightly larger up to the middle and then dropping in size back to normal when it hits the right border. Then, it should do the same in reverse, however it should also set a negative 'z-index' and maybe fade in opacity a bit. The first bit I'm really stuck on, is how to determine if the element is near the middle, in a way that I can have a value that starts at 0.1 on the far left hand size and is 1 in the middle and then back to 0.1 on the far right hand size. Basically, I want them to appear as if they are going around in a faux 3D circle into the page. Then I could do something like this $(this).css({ fontSize: percentageTowardsMiddle * 14, }); Do you know how I could do this? Thanks

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  • Creating/Maintaining a large project-agnostic code library

    - by bufferz
    In order to reduce repetition and streamline testing/debugging, I'm trying to find the best way to develop a group of libraries that many projects can utilize. I'd like to keep individual executable relatively small, and have shared libraries for math, database, collections, graphics, etc. that were previously scattered among several projects and in many cases duplicated (bad!). This library is to be in an SVN repo and several programmers will be working on it. This library will be in constant development along with the executables that utilize it. For example, I want a code file in ProjectA to look something like the following: using MyCompany.Math.2D; //static 2D math methods using MyCompany.Math.3D; //static #D math methods using MyCompany.Comms.SQL; //static methods for doing simple SQLDB I/O using MyCompany.Graphics.BitmapOperations; //static methods that play with bitmaps So in my ProjectA solution file in VisualStudio, in order to develop/debug the MyCompany library I have to add several projects (Math, Comms, Graphics). Things get pretty cluttered and Solution files get out of date quickly between programmer SVN commits. I'm just looking for a high level approach to maintaining a large, shared code base in an SCN repository. I am fully willing to radically redesign my approach. I'm looking for that warm fuzzy feeling you get when you're design approach is spot on and development is fluid and natural. And ideas? Thanks!!

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  • How to hide zero values in bar3 plot in MATLAB

    - by Doresoom
    I've got a 2-D histogram (the plot is 3D - several histograms graphed side by side) that I've generated with the bar3 plot command. However, all the zero values show up as flat squares in the x-y plane. Is there a way I can prevent MATLAB from displaying the values? I already tried replacing all zeros with NaNs, but it didn't change anything about the plot. Here's the code I've been experimenting with: x1=normrnd(50,15,100,1); %generate random data to test code x2=normrnd(40,13,100,1); x3=normrnd(65,12,100,1); low=min([x1;x2;x3]); high=max([x1;x2;x3]); y=linspace(low,high,(high-low)/4); %establish consistent bins for histogram z1=hist(x1,y); z2=hist(x2,y); z3=hist(x3,y); z=[z1;z2;z3]'; bar3(z) As you can see, there are quite a few zero values on the plot. Closing the figure and re-plotting after replacing zeros with NaNs seems to change nothing: close z(z==0)=NaN; bar3(z)

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  • 1. I fill out a form & click submit. 2. I get the results page. Goal: Get the same results without f

    - by Chris
    This is my first time posting - I greatly appreciate any and all guidance on this subject. Background: I am building a Real Estate web site. I would like to use the free IDX data provided by my local MLS board. The MLS board does not allow me the option of displaying a predefined search and only provides me with a link to the search field. after filling out the search field, I am able to view the results. Goal: I would like to bypass this step and frame the results page into a GoDaddy website I am building, which supports HTML. Here is a link to the search page: http://fgcmls.rapmls.com/scripts/mgrqispi.dll?APPNAME=Fortmyers&PRGNAME=MLSLogin&ARGUMENT=vBSJvLQtMcbg7F0O0KnXDiggv%2F12B0S6Ss9wv4510QA%3D&KeyRid=1 I am trying to only show the listings that appear in my neighborhood. Options include: 1. Property Type - Residential 2. GEO Area - FM11 3. Developments: Fiddlesticks Country Club Once this criteria is entered, I have the page needed to make this project work. Thank all of you for taking the time to read this and for the time you spend helping me out. Best regards, Chris

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  • Alternative to as3isolib?

    - by tedw4rd
    Hi everyone, I've been working on a Flash game that involves an isometric space. I've been using as3isolib for a while now, and I'm less than impressed with how easy it is to use. Whether I'm approaching it the wrong way or it's just not that great to use is a question for another post. Anyways, I've been thinking of a different way to approach the problem of isometric positions, and I think I've got an idea that might work. Essentially, each object that is to be rendered to the iso-space maintains a 3-coordinate position. Those items are then registered with a camera that projects that 3-coordinate position to a 2-coordinate point on the screen according to the math on this Wikipedia article. Then, the MovieClip is added to the stage (or to the camera's MovieClip, perhaps) at that point, and at a child index of the point's y-value. That way, I figure objects that are closer to the camera will be "above" the objects further away, and will get rendered over them. So my question, then, is two-fold: Do you think this idea will work the way I think it will? Are there any existing 3D matrix/vector packages that I should look at? I know there's a Matrix3 class in Flex 3, but we're not using Flex for this game. Thanks!

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  • Label on the Chart using Microsoft Chart controls

    - by azamsharp
    I am creating a 3d chart using Microsoft Chart controls. Here is the image: I want to show the point on the top of each bar graph. Like for Exam 1 on top of bar chart it should show 2 (as in 2 points) etc. Here is the code: private void BindData() { var exams = new List<Exam>() { new Exam() { Name = "Exam 1", Point = 10 }, new Exam() { Name = "Exam 2", Point = 12 }, new Exam() { Name = "Exam 3", Point = 15 }, new Exam() { Name = "Exam 4", Point = 2 } }; var series = ExamsChart.Series["ExamSeries"]; series.YValueMembers = "Point"; series.XValueMember = "Name"; //series.MarkerStyle = System.Web.UI.DataVisualization.Charting.MarkerStyle.Circle; //series.MarkerSize = 20; //series.LegendText = "hellow"; //series.Label = "something"; var chartAreas = ExamsChart.ChartAreas["ChartArea1"]; ExamsChart.DataSource = exams; ExamsChart.DataBind(); } and here is the html code: <asp:Chart ID="ExamsChart" Width="600" Height="320" runat="server"> <Titles> <asp:Title Text="Exam Report" /> </Titles> <Series> <asp:Series Name="ExamSeries" ChartType="Column"> </asp:Series> </Series> <ChartAreas> <asp:ChartArea Name="ChartArea1"> <Area3DStyle Enable3D="true" WallWidth="10" /> </asp:ChartArea> </ChartAreas> </asp:Chart>

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  • C++ stack for multiple data types (RPN vector calculator)

    - by Arrieta
    Hello: I have designed a quick and basic vector arithmetic library in C++. I call the program from the command line when I need a rapid cross product, or angle between vectors. I don't use Matlab or Octave or related, because the startup time is larger than the computation time. Again, this is for very basic operations. I am extending this program, and I will make it work as an RPN calculator, for operations of the type: 1 2 3 4 5 6 x out: -3 6 -3 (give one vector, another vector, and the "cross" operator; spit out the cross product) The stack must accept 3d vectors or scalars, for operations like: 1 2 3 2 * out: 2 4 6 The lexer and parser for this mini-calculator are trivial, but I cannot seem to think of a good way for creating the internal stack. How would you create a stack of for containing vectors or doubles (I rolled up my own very simple vector class - less than one hundred lines and it does everything I need). How can I create a simple stack which accepts elements of class Vector or type double? Thank you.

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  • Combinatorial optimisation of a distance metric

    - by Jose
    I have a set of trajectories, made up of points along the trajectory, and with the coordinates associated with each point. I store these in a 3d array ( trajectory, point, param). I want to find the set of r trajectories that have the maximum accumulated distance between the possible pairwise combinations of these trajectories. My first attempt, which I think is working looks like this: max_dist = 0 for h in itertools.combinations ( xrange(num_traj), r): for (m,l) in itertools.combinations (h, 2): accum = 0. for ( i, j ) in itertools.izip ( range(k), range(k) ): A = [ (my_mat[m, i, z] - my_mat[l, j, z])**2 \ for z in xrange(k) ] A = numpy.array( numpy.sqrt (A) ).sum() accum += A if max_dist < accum: selected_trajectories = h This takes forever, as num_traj can be around 500-1000, and r can be around 5-20. k is arbitrary, but can typically be up to 50. Trying to be super-clever, I have put everything into two nested list comprehensions, making heavy use of itertools: chunk = [[ numpy.sqrt((my_mat[m, i, :] - my_mat[l, j, :])**2).sum() \ for ((m,l),i,j) in \ itertools.product ( itertools.combinations(h,2), range(k), range(k)) ]\ for h in itertools.combinations(range(num_traj), r) ] Apart from being quite unreadable (!!!), it is also taking a long time. Can anyone suggest any ways to improve on this?

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  • Amazon access key showing in URL for Carrierwave and Fog

    - by kcurtin
    I just switched from storing my images uploaded via Carrierwave locally to using Amazon s3 via the fog gem in my Rails 3.1 app. While images are being added, when I click on an image in my application, the URL is providing my access key and a signature. Here is a sample URL (XXX replaced the string with the info): https://s3.amazonaws.com/bucketname/uploads/photo/image/2/IMG_4842.jpg?AWSAccessKeyId=XXX&Signature=XXX%3D&Expires=1332093418 This is happening in development (localhost:3000) and when I am using heroku for production. Here is my uploader: class ImageUploader < CarrierWave::Uploader::Base include CarrierWave::RMagick storage :fog def store_dir "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}" end process :convert => :jpg process :resize_to_limit => [640, 640] version :thumb do process :convert => :jpg process :resize_to_fill => [280, 205] end version :avatar do process :convert => :jpg process :resize_to_fill => [120, 120] end end And my config/initializers/fog.rb : CarrierWave.configure do |config| config.fog_credentials = { :provider => 'AWS', :aws_access_key_id => 'XXX', :aws_secret_access_key => 'XXX', } config.fog_directory = 'bucketname' config.fog_public = false end Anyone know how to make sure this information isn't available?

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  • FQL query using stream table doesn't accept app access token

    - by tougher
    I've searched stackoverflow all day long to find an answer without luck, so here we go. I'm trying to fetch data from the stream table like this: FQL: SELECT post_id, message, created_time FROM stream WHERE source_id = 131559313586863 URL: http:// graph.facebook.com/fql?q=SELECT+post_id%2C+message%2C+created_time+FROM+stream+WHERE+source_id+%3D+131559313586863&access_token=10669xxxxx74470|PF-7GSdBx0Nxxxxxkdi1KwSQG-w But I get a 400 Bad Request as response with the error message: "An access token is required to request this resource.". I'm fetching an application access token with this url: https:// graph.facebook.com/oauth/access_token?client_id=FACEBOOK_APP_ID&client_secret=FACEBOOK_APP_SECRET&grant_type=client_credentials Facebook state in this blog post that "You will need to pass a valid app or user access token to access this functionality.". Functionality refers to /feed and /posts (the stream table). Futhermore this wiki tells the same story about using the stream table, "From June 3 2011 a token is required to query this table. You can use any application or user token to make the query.". Does anyone see my hopefully obvious flaw? Please note: The profile in the FQL query is public. I need this to run userless though a cronjob. No user interaction is possible. The request works if I replace the app access token with my own user token from https:// developers.facebook.com/tools/explorer Sorry for breaking the URL's. I need more reputation to post more than 2 links :-/

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  • Tips on designing a .NET API for future use with F#

    - by Drew Noakes
    I'm in the process of designing a .NET API to allow developers to create RoboCup agents for the 3D simulated soccer league. I'm pretty happy with how the API work with C# code, however I would like to use this project to improve my F# skill (which is currently based on reading rather than practice). So I would like to ask what kinds of things I should consider when designing an API that is to be consumed by both C# and F# code. Some points. I make fairly heavy use of matrix and vector math. These are currently immutable classes/structs. The API currently defines a few interfaces with the consumer implements (eg: IAgent), using instances of their implementations (eg: MyAgent) to construct other API classes (eg: new Client(myAgent)). The API fires events. The API exposes a few delegate types. The API includes several enums. I'd like to release a version of the API as soon as possible and don't want to make major changes to it later if I realise it's too difficult to work with from F#. Any advice is appreciated.

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  • How to remove the "button" effect for a menu item (WPF)

    - by Sorin Comanescu
    Hi, When the mouse is over a menu item (first level) it displays a 3D button effect. How can this be removed? Thanks. EDIT: Tried <Style TargetType="MenuItem"> <Style.Triggers> <Trigger Property="IsMouseOver" Value="True"> <Setter Property="BorderBrush" Value="Transparent"> <Setter Property="BorderThickness" Value="0"> </Trigger> </Style.Triggers> </Style> with no effect. The menu XAML: <Window x:Class="UCWPF.Window3" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:conv="clr-namespace:UCWPF.Converters" Title="Window3" Height="600" Width="600" Background="{StaticResource WindowBackgroundBrush}" > <StackPanel Style="{StaticResource WindowContainerStyle}"> <Menu> <MenuItem Header="New" Icon="{StaticResource ImageExport}" /> <MenuItem Header="Open" Icon="{StaticResource ImageOpen}" /> <MenuItem Header="Save" Icon="{StaticResource ImageSave}" /> <MenuItem Header="Export" Icon="{StaticResource ImageExport}" /> </Menu> ... And here's the screenshot:

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