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  • Are there programs that iteratively write new programs?

    - by chris
    For about a year I have been thinking about writing a program that writes programs. This would primarily be a playful exercise that might teach me some new concepts. My inspiration came from negentropy and the ability for order to emerge from chaos and new chaos to arise out of order in infinite succession. To be more specific, the program would start by writing a short random string. If the string compiles the programs will log it for later comparison. If the string does not compile the program will try to rewrite it until it does compile. As more strings (mini 'useless' programs) are logged they can be parsed for similarities and used to generate a grammar. This grammar can then be drawn on to write more strings that have a higher probability of compilation than purely random strings. This is obviously more than a little silly, but I thought it would be fun to try and grow a program like this. And as a byproduct I get a bunch of unique programs that I can visualize and call art. I'll probably write this in Ruby due to its simple syntax and dynamic compilation and then I will visualize in processing using ruby-processing. What I would like to know is: Is there a name for this type of programming? What currently exists in this field? Who are the primary contributors? BONUS! - In what ways can I procedurally assign value to output programs beyond compiles(y/n)? I may want to extend the functionality of this program to generate a program based on parameters, but I want the program to define those parameters through running the programs that compile and assigning meaning to the programs output. This question is probably more involved than reasonable for a bonus, but if you can think of a simple way to get something like this done in less than 23 lines or one hyperlink, please toss it into your response. I know that this is not quite meta-programming and from the little I know of AI and generative algorithms they are usually more goal oriented than what I am thinking. What would be optimal is a program that continually rewrites and improves itself so I don't have to ^_^

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  • How to select from datetime in sqlite?

    - by Sein Kraft
    Joined is a datetime data type column in the database and dates are saved as '12/05/2010 15:54:32' This my query: SELECT * FROM users WHERE joined BETWEEN '12/05/2010 00:00:00' AND '12/05/2010 59:59:59' ORDER BY id ASC But it doesn't work. It returns no rows. So how i gan get them?

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  • Regex matching wrong strings

    - by Joe Smalley
    I have this PHP/SQL query: $sql = sprintf("SELECT * FROM %sCubeCart_filemanager WHERE filepath REGEXP '%s[\\/\\\\][^\\/\\\\]+$' AND type = '%d' AND disabled = '0' ORDER BY filepath ASC %s", $this->_config['dbprefix'], str_replace(array('\\','/'),'.',$folder), $type, $limit); if '$folder' == 'iha9' it is finding results like 'iha91' and 'iha99' too. Something is wrong with the regular expression, but I don't know how they work, can anyone help?!

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  • Debate: Can a HTTPS connection be hijacked with a man-in-the-middle kind of attack?

    - by Iulian Serbanoiu
    Hi, I'm wondering if the company I work for can see what I'm doing when I'm using a HTTPS connection - gmail for example. My case: I'm using gmail from work but I need to enter a password for a proxy when accesing the first web page - the password is asked inside the browser. I receive from the proxy a certificate which I must accept in order to make the Internet connection work. So the question is: Can https data exchange, between gmail and browser, be tracked? Thanks, Iulian

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  • How stable are Cisco IOS OIDs for querying data with SNMP across different model devices?

    - by Daniel Papasian
    I'm querying a bunch of information from cisco switches using SNMP. For instance, I'm pulling information on neighbors detected using CDP by doing an snmpwalk on .1.3.6.1.4.1.9.9.23 Can I use this OID across different cisco models? What pitfalls should I be aware of? To me, I'm a little uneasy about using numeric OIDs - it seems like I should be using a MIB database or something and using the named OIDs, in order to gain cross-device compatibility, but perhaps I'm just imagining the need for that.

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  • How is this Nested Set SQL query converted into a LINQ query?

    - by Chad
    Querying a Nested Set Model table, here's the SQL... how can this be written in LINQ? SELECT parent.name FROM nested_category AS node, nested_category AS parent WHERE node.lft BETWEEN parent.lft AND parent.rgt AND node.name = 'FLASH' ORDER BY parent.lft; particularly, the FROM part... never tried to do anything like that in LINQ.

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  • ASP.NET MVC 2 - user defined database connection.

    - by J Harley
    Hello, I am looking to port my very basic DBMS software from classic ASP to ASP.net - however the user would need to input the connection details in order to connect to their specific DBMS server. Is this at all possible with ASP.NET MVC (very similar to DSN-less connections in ASP). Cheers, Joel

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  • Rails: three most recent comments for unique users

    - by Dennis Collective
    class User has_many :comments end class Comment belongs_to :user named_scope :recent, :order => 'comments.created_at DESC' named_scope :limit, lambda { |limit| {:limit => limit}} named_scope :by_unique_users end what would I put in the :by_unique_users so that I can do Comment.recent.by_unique_users.limit(3), and only get one comment per user

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  • Java Folder Location for Image NetBeans 6.8

    - by ikurtz
    greetings, today i have started to learn java using netbeans ide. i would like my jframe to display an icon as stated in the following: setIconImage(Toolkit.getDefaultToolkit().getImage("SartreIcon.jpg")); the questin is under netbeans ide.. exactly in which folder do i place the graphic in question in order to load it? thanks.

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  • Join tables to get sold products

    - by latvian
    Hi, I am joining two tables 'sales/order_item_collection' and 'sales/orders' by 'order_id', so that afterward i can filter sold products by 'store_id' and 'product_name' Here is the code: $orderTable = Mage::getSingleton('core/resource')-getTableName('sales/order'); $itemsCollection= Mage::getResourceModel('sales/order_item_collection') -join(array('ord'=$orderTable),'e.order_id = ord.entity_id'); Why is this join not working? Thank you

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  • Getting all the fields and properties of a custom attribute from a specific instance

    - by Gbps
    I have a custom attribute PackerAttrib which takes no data, simply marking a field or property, which will be used to mark a property or field of a class inherited from Panel in order to serialize it later on. How would I take an instance of any object derived from Panel and get a Directory<string s, object o> where s is the name of the field or property and o is the current value of said field or property from the instance. Thank you, don't be afraid to ask me to clarify!

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  • Java - Collections.sort() performance

    - by msr
    Hello, Im using Collections.sort() to sort a LinkedList whose elements implements Comparable interface, so they are sorted in a natural order. In the javadoc documentation its said this method uses mergesort algorithm wich has n*log(n) performance. My question is if there is a more efficient algorithm to sort my LinkedList? The size of that list could be very high and sort will be also very frequent. Thanks!

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  • How to run unit tests in STAThread mode?

    - by Peter
    I would like to test an app that uses the Clipboard (WindowsForms) and I need the Clipboard in my Unittests also. In order to use it, it should run in STA mode, but since the NUnit Testfixture does not have a main method, I don't know where/how to annotate it... Thanks!

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  • How to determine the difference among dates in the same column?

    - by Vera
    How to determine the difference among dates of birth? +----------+----------+------------+ | id | name | birth | +----------+----------+------------+ | 00001 | Claws | 2010-04-17 | | 00002 | Claws | 2010-01-31 | | 00003 | Claws | 2009-11-31 | | 00004 | Claws | 2009-09-31 | | 00005 | Claws | 2009-07-31 | | 00006 | Claws | 2008-10-31 | +----------+----------+------------+ I would like to obtain this: +----------+----------+------------+------------------------------------------+ | id | name | birth | diff | +----------+----------+------------+------------------------------------------+ | 00001 | Claws | 2010-04-17 | diff (id1-id2) = 2010-01-31 - 2010-04-17 | | 00002 | Claws | 2010-01-31 | diff (id2-id3) = 2010-01-31 - 2009-11-31 | | 00003 | Claws | 2009-11-31 | diff (id3-id4) = 2010-01-31 - 2009-09-31 | If possible, ORDER BY diff DESC Thank you for helping Vera

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  • How to retrieve caller context object in Ruby ?

    - by David
    Hi, hereafter is my piece of code that I want to simplify in order to avoid passing an extra argument on each call : module M def do_something(context) puts "Called from #{context}" end module_function :do_something end class Foo def do_stuff M.do_something(self) end end Foo.new.do_stuff Is there a way to do the same think without passing 'self' as an input argument to 'do_something' method like this ? module M def do_something puts "Called from #{method that returns caller object}" end module_function :do_something end class Foo def do_stuff M.do_something end end Foo.new.do_stuff Thanks for your support!

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  • anyone research DevExpress' source code ?

    - by MemoryLeak
    I want to study the source code of DevExpress, does anyone have any information about that ? Since I really don't know how to start to read it. if you are also researching the source code of devexpress and you would share it on your blog, then could you please give me your blog link ? EDIT: once you purchase the universal version it will offer you the source for debugging, please refer to https://www.devexpress.com/ClientCenter/Order/default.aspx?group=.NET

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  • How to REALLY focus a link using jQuery / javascript

    - by Bobby Jack
    Calling the jQuery focus() method on a link appears to only partially focus the link. Whilst the link has focus to the extent that pressing ENTER follows the link, it doesn't take on the default outline styling (or adopt any styling set via the :focus pseudo-class), nor is the tab-order correctly 'entered'. Any ideas on how to resolve this? (results observed in Firefox 3.6.2)

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  • Getting MySQL record count with C#

    - by she hates me
    Hello, I would like to know how can I get record count of a query with C#. Here is the code that I use.. MySqlDataReader recordset = null; query = new MySqlCommand("SELECT * FROM test ORDER BY type_ID ASC", this.conn); recordset = query.ExecuteReader(); while (recordset.Read()) { result.Add(recordset["type_ID"].ToString()); } return result;

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  • Android - OPENGL cube is NOT in the display

    - by Marc Ortiz
    I'm trying to display a square on my display and i can't. Whats my problem? How can I display it on the screen (center of the screen)? I let my code below! Here's my render class: public class GLRenderEx implements Renderer { private GLCube cube; Context c; GLCube quad; // ( NEW ) // Constructor public GLRenderEx(Context context) { // Set up the data-array buffers for these shapes ( NEW ) quad = new GLCube(); // ( NEW ) } // Call back when the surface is first created or re-created. @Override public void onSurfaceCreated(GL10 gl, EGLConfig config) { // NO CHANGE - SKIP } // Call back after onSurfaceCreated() or whenever the window's size changes. @Override public void onSurfaceChanged(GL10 gl, int width, int height) { // NO CHANGE - SKIP } // Call back to draw the current frame. @Override public void onDrawFrame(GL10 gl) { // Clear color and depth buffers using clear-values set earlier gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT); gl.glLoadIdentity(); // Reset model-view matrix ( NEW ) gl.glTranslatef(-1.5f, 0.0f, -6.0f); // Translate left and into the // screen ( NEW ) // Translate right, relative to the previous translation ( NEW ) gl.glTranslatef(3.0f, 0.0f, 0.0f); quad.draw(gl); // Draw quad ( NEW ) } } And here is my square class: public class GLCube { private FloatBuffer vertexBuffer; // Buffer for vertex-array private float[] vertices = { // Vertices for the square -1.0f, -1.0f, 0.0f, // 0. left-bottom 1.0f, -1.0f, 0.0f, // 1. right-bottom -1.0f, 1.0f, 0.0f, // 2. left-top 1.0f, 1.0f, 0.0f // 3. right-top }; // Constructor - Setup the vertex buffer public GLCube() { // Setup vertex array buffer. Vertices in float. A float has 4 bytes ByteBuffer vbb = ByteBuffer.allocateDirect(vertices.length * 4); vbb.order(ByteOrder.nativeOrder()); // Use native byte order vertexBuffer = vbb.asFloatBuffer(); // Convert from byte to float vertexBuffer.put(vertices); // Copy data into buffer vertexBuffer.position(0); // Rewind } // Render the shape public void draw(GL10 gl) { // Enable vertex-array and define its buffer gl.glEnableClientState(GL10.GL_VERTEX_ARRAY); gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertexBuffer); // Draw the primitives from the vertex-array directly gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, 0, vertices.length / 3); gl.glDisableClientState(GL10.GL_VERTEX_ARRAY); } } Thanks!!

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