Search Results

Search found 1102 results on 45 pages for 'recurrence relation'.

Page 27/45 | < Previous Page | 23 24 25 26 27 28 29 30 31 32 33 34  | Next Page >

  • How Manage Big Linq DataContext ?

    - by Rev
    Hi The major problem in .net programs is "How manage memory for best performance". so Microsoft use garbage collector in .net and with that, we don't need to do something for managing memory(or better say we can use GC easily) But when you develop big project(business app), you make too many tables and database for your own project. so if you use Linq-to-sql, we must build DataContext include hundred or more tables. That make problem for program when you create an object from datacontext, that object give big amount of memory. also we cant divide datacontext to datacontexts(cuz relation between tables) so "How manage datacontext and memory"?

    Read the article

  • Using PHP Sockets as a "Relay"

    - by Trikks
    Hi! I'm trying to create a left php socket-server < right relation with php sockets. Let's say that I have a server-daemon on the left side, like a vnc-server that connects to the socket-server. On the right side I've got a client that want to connect to the left server-daemon, but it has to be done through the socket-server. The server environment is a fully featured Linux or Mac OS X Server host with php5.3. Any idéas? Thanks / Trikks

    Read the article

  • Core Data => Adding a related object always nil

    - by mongeta
    Hello, I have two tables related: DataEntered and Model DataEntered -currentModel Model One DataEntered can have only ONE Model, but a Model can stay into many DataEntered. The relationship is from DataEntered to Model (No To Many-relathionship) and no inverse relation. XCode generates the setters for DataEnteredModel: @property (nonatomic, retain) NSSet * current_model; - (void)addCurrent_modelObject:(CarModel *)value; - (void)addCurrent_model:(NSSet *)value; I have a Table and when I select a model, I want to store it to DataEntered: Model *model = [fetchedResultsController objectAtIndexPath:indexPath]; NSLog(@"Model %@",model.name); // ==> gives me the correct model name [dataEntered addCurrent_modelObject:model]; // ==> always nil [dataEntered setCurrent_model:[fetchedResultsController objectAtIndexPath:indexPath]]; // the same, always nil what I'm doing wrong ????? thanks, r.

    Read the article

  • Avoid htaccess redirecting to one folder Yii

    - by JG Estevez
    I have a website running over Yii Framework, I created a folder in the root path named blog, I installed a wordpress blog under this folder, but the files .htaccess that comes with yii is trying to redirect my request to www.domain.com/blog to the controller/action type which I don't want, I want to treat the blog folder as a completely app with no relation to yii. here is what I've done so far Options +FollowSymLinks IndexIgnore */* RewriteEngine on RewriteCond %{REQUEST_URI} "/blog/" RewriteRule (.*) $1 [L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . index.php as you can see I added the conditions to avoid redirecting for the blog folder but when I try to access the the url is telling me The page isn't redirecting properly. How can I solve this?? thanks

    Read the article

  • Comparing COUNT values within a query?

    - by outsyncof
    I have the following tables in a relation: person(ssn,sex) employment(ssn,workweeksperyear) assume ssn is a key. My assignment was to do this: Given as input the number of weeks per year a person has worked, determine whether there are more males than females who work more weeks than the input value. SELECT COUNT(sex) AS NumMales FROM person WHERE sex = 'Male' AND ssn IN (SELECT ssn FROM employment WHERE workweeksperyear > 48); The above query gets me the number of males for an input value and I could do the same for number of females but how do I compare the 2 results? Any help will be greatly appreciated!

    Read the article

  • what is the idea behind scaling an image using lanczos?

    - by banister
    Hi, I'm interested in image scaling algorithms and have implemented the bilinear and bicubic methods. However, I have heard of the lanczos and other more sophisticated methods for even higher quality image scaling and I am very curious how they work. Could someone here explain the basic idea behind scaling an image using lanczos (both upscaling and downscaling) and why it results in higher quality? I do have a background in fourier analysis and have done some signal processing stuff in the past, but not with relation to image processing, so don't be afraid to use terms like "frequency response" and such in your answer :) EDIT: I guess what i really want to know is the concept and theory behind using a convolution filter for interpolation. (Note: i have already read the wikipedia article on lanczos resampling but it didn't have nearly enough detail for me) thanks alot!

    Read the article

  • Alternative design for a synonyms table?

    - by Majid
    I am working on an app which is to suggest alternative words/phrases for input text. I have doubts about what might be a good design for the synonyms table. Design considerations: number of synonyms is variable, i.e. football has one synonym (soccer), but in particular has two (particularly, specifically) if football is a synonym to soccer, the relation exists in the opposite direction as well. our goal is to query a word and find its synonyms we want to keep the table small and make adding new words easy What comes to my mind is a two column design with col a = word and col b = delimited list of synonyms Is there any better alternative? What about using two tables, one for words and the other for relations?

    Read the article

  • Nhibernate mapping: fixed count multiple members instead of collection

    - by AhmetC
    I don't want to put wheels into a collection. How can i map kind of relation? Class Wheel { int id; Car Owner; } Class Car { int id; Wheel Wheel1; Wheel Wheel2; Wheel Wheel3; Wheel Wheel4; } I tried this but Wheelmap.Owner comes always null : Class WheelMap : ClassMap<Wheel> { Id(x=>x.Id); References(x=>x.Owner); } Class CarMap : ClassMap<Car> { Id(x=>x.Id); References(x=>x.Wheel1).Cascade.All(); References(x=>x.Wheel2).Cascade.All(); References(x=>x.Wheel3).Cascade.All(); References(x=>x.Wheel4).Cascade.All(); }

    Read the article

  • Equivalence Classes

    - by orcik
    I need to write a program for equivalence classes and get this outputs... (equiv '((a b) (a c) (d e) (e f) (c g) (g h))) => ((a b c g h) (d e f)) (equiv '((a b) (c d) (e f) (f g) (a e))) => ((a b e f g) (c d)) Basically, A set is a list in which the order doesn't matter, but elements don't appear more than once. The function should accept a list of pairs (elements which are related according to some equivalence relation), and return a set of equivalence classes without using iteration or assignment statements (e.g. do, set!, etc.). However, set utilities such as set-intersection, set-union and a function which eliminates duplicates in a list and built-in functions union, intersection, and remove-duplicates are allowed. Thanks a lot! By the way, It's not a homework question. A friend of mine need this piece of code to solve smilar questions.

    Read the article

  • What is more interesting or powerful: Curry/Mercury/Lambda-Prolog/your suggestion.

    - by Bubba88
    Hi! I would like to ask you about what formal system could be more interesting to implement from scratch/reverse engineer. I've looked through some existing and rather open (open in the sense of free/open-source) projects of logical/declarative programming systems. I've decided to make up something similar in my free time, or at least to catch the general idea of implementation. It would be great if some of these systems would provide most of the expressive power and conciseness of modern academic investigations in logic and it's relation with computational models. What would you recommend to study at least at the conceptual level? For example, Lambda-Prolog is interesting particularly because it allows for higher order relations, but AFAIK (I might really be mistaken :)) is based on intuitionist logic and therefore lack the excluded-middle principle; that's generally a disatvantage for me.. I would also welcome any suggestions about modern logical programming systems which are less popular but more expressive/powerful. I guess, this question will need refactoring, but thank you in advance! :)

    Read the article

  • Ethics of assisting other programmers, where do we draw the line?

    - by Chris
    In general, not just in relation to stackoverflow, sometimes I'm asked a programming question for which the answer will probably be used for good purposes, but there is a chance that it could not be. Two recent examples which reminded me of some real world questions I've been asked are: Send email to many users, and keep a formless application from closing for a keyboard hook Though I don't believe the intent of the authors of those questions is in any way nefarious, occasionally someone does ask such a question for purposes of aiding a spamming effort, or creating a keylogger. Even though the questioner and answerers had good intent, a 3rd party could pervert those answers to create a piece of malware or a spam utility. Should we always trust the questioner to use the answer for good? Should we feel obligated to ask the purpose of a question, and how the answer will be used? And how can we prevent answers from being overheard (when asked verbally) or being referenced (when posted publicly online) and then used for unsavory purposes?

    Read the article

  • Salting example in Zend Framework

    - by Geoffrey
    Hello all, I am pretty new to the Zend framework and looking to build an application with pretty tight password security. I have been trying to follow the user guides in relation to password salting but haven't had any luck so far. I have setup my database and table adapter (As described in the documentation on the Zend Framework site but it didn't seem to finish the example (or I am not following well enough!) I have started with: $authAdapter = new Zend_Auth_Adapter_DbTable($dbAdapter, 'users', 'username', 'password', "MD5(CONCAT('".Zend_Registry::get('staticSalt')."', ?, password_salt))" ); But from here, what is done with the password salt? I just need an example and I'll be away! Does anyone have an example or point me in the right direction?? Many thanks!

    Read the article

  • How do I understand what the following means?

    - by Runner
    Quoted from here: if (to_end) { /* If we want to scroll to the end, including horizontal scrolling, * then we just create a mark with right gravity at the end of the * buffer. It will stay at the end unless explicitely moved with * gtk_text_buffer_move_mark. */ gtk_text_buffer_create_mark (buffer, "end", &iter, FALSE); /* Add scrolling timeout. */ return g_timeout_add (50, (GSourceFunc) scroll_to_end, textview); } else { /* If we want to scroll to the bottom, but not scroll horizontally, * then an end mark won't do the job. Just create a mark so we can * use it with gtk_text_view_scroll_mark_onscreen, we'll position it * explicitely when needed. Use left gravity so the mark stays where * we put it after inserting new text. */ gtk_text_buffer_create_mark (buffer, "scroll", &iter, TRUE); /* Add scrolling timeout. */ return g_timeout_add (100, (GSourceFunc) scroll_to_bottom, textview); } Though there are quite a few lines of comments, I still don't understand the logic in it,especially, what's the relation between an mark and the position of scroll bar?

    Read the article

  • Help for a Sql statement

    - by stighy
    Hy at all, today is the day of ...question. I've a single table, with a relation master-detail like this: RecordID MasterID Field1 Field2 .... NrDetail 1 0 xxx yyyy 1 2 0 aaaa bbbb 2 3 1 hhhhh ssss 0 4 2 eee sssss 0 5 2 jjj hhhh 0 As you can see, NrDetail contain the total of "child record". Unfortunately, i've to create this field... and i would like to write it in my table. So my SQL question is: how to do this type of SQL to write the field NrDetail ? Something like: UPDATE table SET NrDetail= (SELECT COUNT(*) as Total FROM table WHERE MasterID= RecordID) But i think there's some mistake... Thank you in advance !

    Read the article

  • Deleting orphans with JPA

    - by homaxto
    I have a one-to-one relation where I use CascadeType.PERSIST. This has over time build up a huge amount of child records that has not been deleted, to such an extend that it is reflected in the performance. Now I wish to add some code that cleans up the database removing all the child records that are not referenced by a parent. At the moment we are talking 400K+ records, at I need to run the code on all customer installations just to be sure they do not run into the same problem. I think the best solution would be to run a named query (because we support two databases) that deletes the necessary records, and this is where I get into problems, because how should I write it in JPQL? The result I want can be defined like the following sql statement, which unfortunaltely does not run on MySQL. DELETE FROM child c1 WHERE c1.pk NOT IN (SELECT DISTINCT p.pk FROM child c2 JOIN parent p ON p.child = c2.pk);

    Read the article

  • Entity framework (3.5): How to translate a certain LINQ query to eSQL?

    - by Sebastian P.R. Gingter
    Hi there, I have the following LINQ query that I need to translate to Entity SQL /eSQL): return (ObjectQuery<User>) from user in Users where !user.Roles.Any(r => r.AnIntegerProperty < 0) select user; User.Roles is an navigation property to the n:m relation to Roles and there also is a Role.Users navigation property the other way round. There aren't User_Roles or Roles_User Entities available in the model, and I can't add these. I also can't use the LINQ statement here, because I need to add .OrderBy("it." + propertyname) (comes from another source, can't change that too) later on which is not possible if the ObjectQuery is build with linq. So how do I translate this to eSQL? And where can I find good eSQL samples? I searched for a whole day until now and must admit that eSQL reference is lousy and there aren't any usable examples around the web.

    Read the article

  • Cluster analysis on two columns that contain name of person in R

    - by Alka Shah
    I am a beginner in R. I have to do cluster analysis in data that contains two columns with name of persons. I converted it in data frame but it is character type. To use dist() function the data frame must be numeric. example of my data: Interviewed.Type interviewed.Relation.Type 1. An1 Xuan 2. An2 The 3. An3 Ngoc 4. Bui Thi 5. ANT feed 7. Bach Thi 8. Gian1 Thi 9. Lan5 Thi . . . 1100. Xung Van I will be grateful for your help.

    Read the article

  • Same table NHibernate mapping

    - by mircea .
    How can i go about defining a same table relation mapping (mappingbycode) using Nhibernate for instance let's say I have a class: public class Structure{ public int structureId; public string structureName; public Structure rootStructure; } that references the same class as rootStructure. mapper.Class<Structure>(m => { m.Lazy(true); m.Id(u => u.structureId, map => { map.Generator(Generators.Identity); }); m.Property(c => c.structureName); m.? // Same table mapping } ; Thanks

    Read the article

  • Can someone describe some DI terms to me?

    - by SoBeNoFear
    I'm in the process of writing a DI framework for PHP 5, and I've been trying to find the 'official' definitions of some words in relation to dependency injection. Some of these words are 'context' and 'lifecycle'. And also, what would I call the object that gets created/injected? Finally, what is the difference between components and services, and which term (if either) should I call the objects that can be injected? I've read Martin Fowler's article and looked through other DI frameworks (Phemto, Spring, Google Guice, Xyster, etc.), but I want to know what you think. Thanks!

    Read the article

  • SQL join to grab data from same table via intermediate table

    - by Sergio
    Hi Could someone help me with building the following query. I have a table called Sites, and one called Site_H. The two are joined by a foreign key relationship on page_id. So the Sites table contains pages, and the Site_H table shows which pages any given page is a child of by having another foreign key relation back to the site table with a column called ParentOf. So, a page can be have another page as a parent. Other data is stored in the Site_H table such as position etc, hence why it is separated out. I would like a query that returns the details of a page along with the details of its parent page. I just cant quite think about how to structure the SQL. Thanks

    Read the article

  • Updating records in Postgres using FROM clause

    - by Summer
    Hi, I'm changing my db schema, and moving column 'seat' from old_table to new_table. First I added a 'seat' column to new_table. Now I'm trying to populate the column with the values from old_table. UPDATE new_table SET seat = seat FROM old_table WHERE old_table.id = new_table.ot_id; This returns ERROR: column reference "seat" is ambiguous. UPDATE new_table nt SET nt.seat = ot.seat FROM old_table ot WHERE ot.id = nt.ot_id; Returns ERROR: column "nt" of relation "new_table" does not exist Ideas?

    Read the article

  • Help me refactoring this nasty Ruby if/else statement

    - by Suborx
    Hello, so I have this big method in my application for newsletter distribution. Method is for updating rayons and i need to assigned user to rayon. I have relation n:n through table colporteur_in_rayons witch have attributes since_date and _until_date. I am junior programmer and i know this code is pretty dummy :) I appreciated every suggestion. def update rayon = Rayon.find(params[:id]) if rayon.update_attributes(params[:rayon]) if params[:user_id] != "" unless rayon.users.empty? unless rayon.users.last.id.eql?(params[:user_id]) rayon.colporteur_in_rayons.last.update_attributes(:until_date = Time.now) Rayon.assign_user(rayon.id,params[:user_id]) flash[:success] = "Rayon #{rayon.name} has been succesuly assigned to #{rayon.actual_user.name}." return redirect_to rayons_path end else Rayon.assign_user(rayon.id,params[:user_id]) flash[:success] = "Rayon #{rayon.name} has been successfully assigned to #{rayon.actual_user.name}." return redirect_to rayons_path end end flash[:success] = "Rayon has been successfully updated." return redirect_to rayons_path else flash[:error] = "Rayon has not been updated." return redirect_to :back end end

    Read the article

  • Seaching for an element in a circular sorted array

    - by guirgis
    I wanted to share this with you, i had this problem in a google interview. we want to search for a given element in a circular sorted array in complexity not greater than O(Log n). ex: search for 13 in {5,9,13,1,3}. My idea was to convert the circular array into a regular sorted array then do a binary search on the resulting array, but my problem was the algorithm i came up was stupid that it takes O(n) in the worst case: for(i = 1; i < a.length; i++){ if (a[i] < a[i-1]){ minIndex = i; break; } } then the corresponding index of ith element will be determined from the following relation: (i + minInex - 1) % a.length it is clear that my conversion (from circular to regular) algorithm may take O(n), so we need a better one, any suggestions?

    Read the article

  • Filtering foreign keys with AJAX in Django admin

    - by cnobile
    I have most of this figured out already. I have AJAX returning the region/state/province when a country is selected. The correct foreign key is saved to the database, however, when the record is viewed afterwards the selected state is not shown in the select nor are any states for the selected country. I understand why this is happening as, the admin view is not aware of the relation between the state and the country. So here is the question. Is there a hook in the admin view that will allow me to load the correct states for the country and set the selected attribute on the option in the select tag? Or how can I override the admin view for any forms that require the country and region/state/province set? I am using jQuery and Djando-1.1. Thanks

    Read the article

  • Symfony2 : How to make the php_intl extension available for Symfony2?

    - by Miles M.
    I'm trying to follow this documentation on Symfony : http://symfony.com/doc/current/book/forms.html ok so here is my thing, I've externalised my form and created a specific form class for handling the process and being able to reuse it. So what happen when I submit the form, whatever the info are okay or not for my class, I get this fatal Error : Fatal error: Call to a member function setAttribute() on a non-object in C:\Program Files (x86)\wamp\www\QNetworks\vendor\symfony\src\Symfony\Component\Form\Extension\Core\DataTransformer\NumberToLocalizedStringTransformer.php on line 130 Call Stack I'm running with php 5.3.9 and my intl extension is installed and activated BUT when I run the app/check.php command I see : [[WARNING]] Checking that the intl extension is available: FAILED * Install and enable the intl extension (used for validators) * So I don't understand what the problem with this extension. Should I reinstall it ? When I go here : http://php.net/manual/en/intl.requirements.php I see tht i can install the PECL or the ICU library, but i don't know if I should and if there is any relation with my problem .. Thank for your help !!

    Read the article

< Previous Page | 23 24 25 26 27 28 29 30 31 32 33 34  | Next Page >