hash - Probing every R'th location for hashing -


something curious lecture:

suppose want probe every rth location function x mod 10 , r = 2. hash 4, 14, 114, 1114, , 11114:

  • 4 go in slot 4.
  • 14 first try slot 4, seeing it's full, it'll go slot 6 (+r).
  • 114 find slot 4 full, going slot 6 (+r), since that's full, it'll go slot 0 (+2r).

but 1114, seems keep going on forever- no matter goes, it'll run full slot. happens in case?

there 3 alternatives unsolvable hash collisions on open addressing hash tables:

  1. re-hash entire table different hash function, , hope no new unsolvable hash collisions occur.
  2. resize table (with operations might incur), guarantee more possible slots.
  3. keep separate list unsolvable hash collisions.

none of options good.

what should chose probing method in combination hash table size. if table size odd, same constant step, not run in problem while there still space in table.

popular combinations include quadratic probing prime-sized hash table, guarantees insertion success if table less half-full, , quadratic probing triangular numbers , power of 2 hash table, guarantees insertion if table isn't full. power of 2 sized hash tables have many advantages, defect being unforgiving on quality of hash algorithm.


Comments

Post a Comment

Popular posts from this blog

java - Play! framework 2.0: How to display multiple image? -

i need display gallery of photos. here template: @(photos: list[photo]) @title = { <bold>gallery</bold> } @main(title,"photo"){ <ul class="thumbnails"> @for(photo <- photos) { <li class="span3"> <a href="#" class="thumbnail"> <img src="@photo.path" alt=""> </a> </li> } </ul> } and here controller method: public static result getphotos() { return ok(views.html.photo.gallery.render(photo.get())); } and here photo bean : @entity public class photo extends model { @id public long id; @required public string label; public string path; public photo(string path, string label) { this.path = path; this.label = label; } private static finder<long, photo> find = new finder<long, photo>( long.class, photo.class); public static list<phot...
Read more

gmail - Is there any documentation for read-only access to the Google Contacts API? -

i want read-only access user's google contacts. there stackoverflow member wanted this, , received following answer : yes, there is, use https://www.googleapis.com/auth/contacts.readonly scope , "view contacts". this exchange reference read-only access google contacts can find using google. simply using access token obtained attempt read usual google contacts api (i.e. https://www.google.com/m8/feeds ) fails insufficient permissions. similarly, using google contacts api on new target fails 404 errors (for example https://www.googleapis.com/auth/contacts.readonly/default/full ). is there documentation anywhere on how use api, or permissible way access google contacts api full read-write access?
Read more

php - Controller/JToolBar not working in Joomla 2.5 -

relevant code: jtoolbarhelper::custom('savecategories', 'save', '', 'save', false, false); ... <input type="hidden" name="controller" value="easyblogcontroller"> according can dig docs , own previous questions, should call savecategories() function in easyblogcontroller . i've tried setting value easyblog , easyblog.php (file name) current easyblogcontroller (class name). clicking on save button refreshes page. not redirect, echo or var_dump test code put in savecategories() function. var_dump ing jrequest::getvar('controller') , 'task' return correct values. creating controller object , using $controller->execute('task'); works. the values going depend on location of controller trying call, , have couple options here. typically there controller in base folder of component (likely components/com_easyblog) in file called controller.php , class name inside ...
Read more