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  • are deleted entries counted in the load factor of a hash table using open addressing

    - by Dr. Monkey
    When calculating the load factor of a hashtable with an open-addressing array implementation I am using: numberOfKeysInArray/sizeOfArray however it occurred to me that since deleted entries must be marked as such (to distinguish them from empty spaces), it might make sense to include these in the number of keys. My thinking is that as far as estimating the average number of probes to find an entry, deleted entries should count towards the load factor, but as far as inserting a new key they should not. Which is the proper calculation: including deleted keys or not?

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  • jQuery color change or CSS?

    - by Josh
    I've tried achieving a hover/selected color change for a particular field, but I'm thinking jQuery is the answer. I've looked into some button click tutorials, but maybe I'm not just seeing it or doing it correctly. The idea here is that when a user hovers over a Headline, the background color changes, when they click the headline to expand it, the background color remains constant (selected), however as it stands right now the background color of the expanded fields do not change. Here is the demo: http://www.notedls.com/demo

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  • Blogging Infastructure using Zend Framework?

    - by Steve Griff
    Hi there folks, I'm researching the prospect of incorporating a blog into my site. Currently, my site is written using the Zend Framework so it's not just a case of using Wordpress and that be the end of it. I was wondering. Has someone already done what I'm thinking of doing and written a blog infrastructure with comments and so forth using ZF? Anyone got any suggestions? Thanks Steve

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  • How to optimize my PostgreSQL DB for prefix search?

    - by asmaier
    I have a table called "nodes" with roughly 1.7 million rows in my PostgreSQL db =#\d nodes Table "public.nodes" Column | Type | Modifiers --------+------------------------+----------- id | integer | not null title | character varying(256) | score | double precision | Indexes: "nodes_pkey" PRIMARY KEY, btree (id) I want to use information from that table for autocompletion of a search field, showing the user a list of the ten titles having the highest score fitting to his input. So I used this query (here searching for all titles starting with "s") =# explain analyze select title,score from nodes where title ilike 's%' order by score desc; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------- Sort (cost=64177.92..64581.38 rows=161385 width=25) (actual time=4930.334..5047.321 rows=161264 loops=1) Sort Key: score Sort Method: external merge Disk: 5712kB -> Seq Scan on nodes (cost=0.00..46630.50 rows=161385 width=25) (actual time=0.611..4464.413 rows=161264 loops=1) Filter: ((title)::text ~~* 's%'::text) Total runtime: 5260.791 ms (6 rows) This was much to slow for using it with autocomplete. With some information from Using PostgreSQL in Web 2.0 Applications I was able to improve that with a special index =# create index title_idx on nodes using btree(lower(title) text_pattern_ops); =# explain analyze select title,score from nodes where lower(title) like lower('s%') order by score desc limit 10; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------ Limit (cost=18122.41..18122.43 rows=10 width=25) (actual time=1324.703..1324.708 rows=10 loops=1) -> Sort (cost=18122.41..18144.60 rows=8876 width=25) (actual time=1324.700..1324.702 rows=10 loops=1) Sort Key: score Sort Method: top-N heapsort Memory: 17kB -> Bitmap Heap Scan on nodes (cost=243.53..17930.60 rows=8876 width=25) (actual time=96.124..1227.203 rows=161264 loops=1) Filter: (lower((title)::text) ~~ 's%'::text) -> Bitmap Index Scan on title_idx (cost=0.00..241.31 rows=8876 width=0) (actual time=90.059..90.059 rows=161264 loops=1) Index Cond: ((lower((title)::text) ~>=~ 's'::text) AND (lower((title)::text) ~<~ 't'::text)) Total runtime: 1325.085 ms (9 rows) So this gave me a speedup of factor 4. But can this be further improved? What if I want to use '%s%' instead of 's%'? Do I have any chance of getting a decent performance with PostgreSQL in that case, too? Or should I better try a different solution (Lucene?, Sphinx?) for implementing my autocomplete feature?

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  • MySQL function: Rotate old entries to archive table

    - by confiq
    Hi, I'm looking for the function that will take rows older then X days and put it in archive table... Was thinking to make function so it will be easer to execute... something like CREATE TABLE archive_NUMBER_OF_WEEK (...); INSERT INTO archive_NUMBER_OF_WEEK SELECT * FROM content WHERE DATE < X days; DELETE * FROM content WHERE DATE < X days RENAME TABLE content TO content_backup, content_temp TO content; Will post when I finish it :)

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  • DNN 5.0 Modules available for Free or less cost

    - by Harryboy
    I am just planning to work on CMS with some features like blog, forum, chat, broadcast, video, Document management, poll, dashboard, advertisement, alerts & reminder, events, task etc.. I am thinking of using DNN for development as i feel most of the modules are available so i just need to do the customization. Also suggest what all are the modules available in core DNN (Community version) is anybody is having list what all are the modules available for DNN 5.0 ? Please provide the link for the same.

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  • How do bind a List<object> to a DataGrid in Silverlight?

    - by Ben McCormack
    I'm trying to create a simple Silverlight application that involves parsing a CSV file and displaying the results in a DataGrid. I've configured my application to parse the CSV file to return a List<CSVTransaction> that contains properties with names: Date, Payee, Category, Memo, Inflow, Outflow. The user clicks a button to select a file to parse, at which point I want the DataGrid object to be populated. I'm thinking I want to use data binding, but I can't seem to figure out how to get the data to show up in the grid. My XAML for the DataGrid looks like this: <data:DataGrid IsEnabled="False" x:Name="TransactionsPreview"> <data:DataGrid.Columns> <data:DataGridTextColumn Header="Date" Binding="{Binding Date}" /> <data:DataGridTextColumn Header="Payee" Binding="{Binding Payee}"/> <data:DataGridTextColumn Header="Category" Binding="{Binding Category}"/> <data:DataGridTextColumn Header="Memo" Binding="{Binding Memo}"/> <data:DataGridTextColumn Header="Inflow" Binding="{Binding Inflow}"/> <data:DataGridTextColumn Header="Outflow" Binding="{Binding Outflow}"/> </data:DataGrid.Columns> </data:DataGrid> The code-behind for the xaml.cs file looks like this: private void OpenCsvFile_Click(object sender, RoutedEventArgs e) { try { CsvTransObject csvTO = new CsvTransObject.ParseCSV(); //This returns a List<CsvTransaction> and passes it //to a method which is supposed to set the DataContext //for the DataGrid to be equal to the list. BindCsvTransactions(csvTO.CsvTransactions); TransactionsPreview.IsEnabled = true; MessageBox.Show("The CSV file has a valid header and has been loaded successfully."); } catch (Exception ex) { MessageBox.Show(ex.Message); } } private void BindCsvTransactions(List<CsvTransaction> listYct) { TransactionsPreview.DataContext = listYct; } My thinking is to bind the CsvTransaction properties to each DataGridTextColumn in the XAML and then set the DataContext for the DataGrid to the List<CsvTransaction at run-time, but this isn't working. Any ideas about how I might approach this (or do it better)?

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  • Cleaning all inline events from HTML tags

    - by Itay Moav
    For HTML input, I want to neutralize all HTML elements that have inline js (onclick="..", onmouseout=".." etc). I am thinking, isn't it enough to encode the following chars? =,(,) So onclick="location.href='ggg.com'" will become onclick%3D"location.href%3D'ggg.com'" What am I missing here? Edit: I do need to accept active HTML (I can't escape it all or entities is it).

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  • Good Hash Function for Strings

    - by Leif Andersen
    I'm trying to think up a good hash function for strings. And I was thinking it might be a good idea to sum up the unicode values for the first five characters in the string (assuming it has five, otherwise stop where it ends). Would that be a good idea, or is it a bad one? I am doing this in Java, but I wouldn't imagine that would make much of a difference.

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  • Going international: tha language class or method in .net

    - by Nano HE
    Hi, I created a small WPF desktop application. I am thinking about how to make my application internationalized. Is there any Language Class to research (.NET 3.5 based)? I want to load the my application language from windows region/language configuration automatically. OR. some method to switch language from my application menu list.( no additional language package installation, assume the windowns system language packages support Chinese/English/Japanese/Korea already).

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  • installer for distribution visual studio 2008 express

    - by Matt Facer
    Hi guys... I've been doing some research in to installers for visual studio express 2008. I don't much like the standard publish option. I'd rather have a proper windows installer. Am I right in thinking that the only way to do this is to upgrade to the standard edition? Are there any third party tools which can be used? I've tried googling a lot, but don't seem to be getting anywhere!

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  • Quickly create large file on a windows system?

    - by Leigh Riffel
    In the same vein as http://stackoverflow.com/questions/257844/quickly-create-a-large-file-on-a-linux-system I'd like to quickly create a large file on a windows system. By large I'm thinking 5GB. The content doesn't matter. A built in command or short batch file would be preferable, but I'll accept an application if there are no other easy ways.

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  • Sharepoint Collaboration Portal initial size

    - by tousle
    Around how much space does a Sharepoint Collaboration Portal use up by default (when newly created)? Just asking because I had one created but I'm thinking of using a Team Site site template--if the client won't be utilizing the default "features" of a Collaboration Portal.

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  • Ideas for student parallel programming project

    - by chi42
    I'm looking to do a parallel programming project in C (probably using pthreads or maybe OpenMP) for a class. It will done by a group of about four students, and should take about 4 weeks. I was thinking it would be interesting to attack some NP-complete problem with a more complex algorithm like a genetic algo with simulated annealing, but I'm not sure if it would be a big enough project. Anyone knew of any cool problems that could benefit from a parallel approach?

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  • Replace all & that are not a HTML entity using C#

    - by Eddie
    Basically a dup of this question using php, but I need it for C#. I need to be able to replace any & that is not currently not any HTML entity (e.g. &amp;) before outputting to screen. I was thinking a regex, but I'm not sure if .Net has something built in that will do this.

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  • Colour instead of color?

    - by Jookia
    I'm working on a game engine in C++ and I have methods like setColour and things that use british grammar. While I was thinking how C++ compilers mostly use the english language (correct me if I'm wrong) and how most APIs use american grammar, should I go with the flow and continue the unofficial standard in the grammar programmer high council or be a rebel? I'm not sure which.

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  • Applying different Cascade Style Sheets to the same html page

    - by Noona
    To apply a CSS to an existing html page I need to add a link that links to the css file, I am asked to include a link in the webpage that I am building that would link to the same html page but with a different css file, I am thinking I need to create a different css file, then create another .html page by copy the exact content from the first page and only change the link of the css file, but it doesn't seem so efficient and I am assuming there should be a standard method to do this. thanks

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  • Auto-generating toString Method

    - by Gordon
    Is it good or bad practice auto-generating toString methods for some simple classes? I was thinking of generating something like bellow where it takes the variable names and produces a toString method that prints the name followed by it's value. private String name; private int age; private double height; public String toString(){ Formatter formatter = new Formatter(); return formatter.format("Name: %s, Age: %d, Height %f", name, age, height).toString(); }

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  • Best practice zend framework + faceBook Api

    - by simple
    What is better way to integrate facebook api, in zend framework, for login I can implement Zend_Auth_Adapter_Interface but I found something like Zend_Service_Twitter, and thinking if I should implement Zend_Service_interface and what are the odds, sorry haven't looked at the architecture of Zend_Service yet, but any advice would be appreciated and would save me time from going to wrong direction

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  • Export to RSS Feed

    - by citronas
    I'm looking for class that can generate RSS feeds. I'm thinking of a usage like this. RssClass foo = new RssClass(); foo.addEntry("title", URL); foo.Export("myexportpath.rss"); Has anybody seen such a class available for free usage?

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  • Any chance to get Core Data using Tokyo Cabinet as the persistent store?

    - by dontWatchMyProfile
    I watched a free high quality video with Aaron Hillegass about Core Data vs Tokyo Cabinet. Besides that this guy is amazingly funny (really, if you want to laugh now, watch it!), he shows off Tokyo Cabinet beeing about 40x faster than Core Data. I wonder if it's worth thinking about how to attach this to Core Data? Does that make any sense? Maybe as a custom atomic store or something like this?

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