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- Random_access abstract "In computer science, random access (more precisely and more generally called direct access) is the ability to access an item of data at any given coordinates in a population of addressable elements. As a rule the assumption is that each element can be accessed roughly as easily and efficiently as any other, no matter how many elements may be in the set, nor how many coordinates may be available for addressing the data. For example, data might be stored notionally in a single sequence like a row, in two dimensions like rows and columns on a surface, or in multiple dimensions. However, given all the coordinates, a program can access each record about as quickly and easily as any other, and in particular, access it in time to be of value to the user. In this sense the choice of data item is arbitrary in the sense that no matter which item is sought, all that is needed to find it, is its address, that is to say, the coordinates at which it is located, such as its row and column (or its track and record number on a magnetic drum). At first the term "random access" was used because the process had to be capable of finding records no matter in which sequence they were required. However, soon the term "direct access" gained favour because one could directly retrieve a record, no matter what its position might be. The operative attribute however is that the device can access any required record immediately on demand. The opposite is sequential access, where a remote element takes longer time to access.[1]A typical illustration of this distinction is to compare an ancient scroll (sequential; all material prior to the data needed must be unrolled) and the book (direct: can be immediately flipped open to any arbitrary page). A more modern example is a cassette tape (sequential — one must fast forward through earlier songs to get to later ones) and a CD (direct access — one can skip to the track wanted, knowing that it would be the one retrieved).In data structures, direct access implies the ability to access any entry in a list in constant time (independent of its position in the list and of list's size). Very few data structures can guarantee this, other than arrays (and related structures like dynamic arrays). Direct access is required, or at least valuable, in many algorithms such as binary search, integer sorting or certain versions of sieve of Eratosthenes.Other data structures, such as linked lists, sacrifice direct access to permit efficient inserts, deletes, or reordering of data. Self-balancing binary search trees may provide an acceptable compromise, where access time is not equal for all members of a collection, but the maximum time to retrieve a given member grows only logarithmically with its size.".
- Random_access thumbnail Random_vs_sequential_access.svg?width=300.
- Random_access wikiPageExternalLink cc938619.aspx.
- Random_access wikiPageID "25612".
- Random_access wikiPageLength "4061".
- Random_access wikiPageOutDegree "20".
- Random_access wikiPageRevisionID "680431445".
- Random_access wikiPageWikiLink Address_space.
- Random_access wikiPageWikiLink Array_data_structure.
- Random_access wikiPageWikiLink Binary_search.
- Random_access wikiPageWikiLink Binary_search_algorithm.
- Random_access wikiPageWikiLink Book.
- Random_access wikiPageWikiLink CD.
- Random_access wikiPageWikiLink Category:Computer_data.
- Random_access wikiPageWikiLink Compact_disc.
- Random_access wikiPageWikiLink Computer_science.
- Random_access wikiPageWikiLink Data_stream.
- Random_access wikiPageWikiLink Data_structure.
- Random_access wikiPageWikiLink Dynamic_array.
- Random_access wikiPageWikiLink Integer_sorting.
- Random_access wikiPageWikiLink Linked_list.
- Random_access wikiPageWikiLink List_(abstract_data_type).
- Random_access wikiPageWikiLink List_(computing).
- Random_access wikiPageWikiLink Page_(paper).
- Random_access wikiPageWikiLink Random-access_machine.
- Random_access wikiPageWikiLink Scroll.
- Random_access wikiPageWikiLink Scroll_(parchment).
- Random_access wikiPageWikiLink Self-balancing_binary_search_tree.
- Random_access wikiPageWikiLink Sequential_access.
- Random_access wikiPageWikiLink Sieve_of_Eratosthenes.
- Random_access wikiPageWikiLink File:Random_vs_sequential_access.svg.
- Random_access wikiPageWikiLinkText "Random access".
- Random_access wikiPageWikiLinkText "Random access#Direct access".
- Random_access wikiPageWikiLinkText "access".
- Random_access wikiPageWikiLinkText "accessed randomly".
- Random_access wikiPageWikiLinkText "random access".
- Random_access wikiPageWikiLinkText "random reads and writes".
- Random_access wikiPageWikiLinkText "random".
- Random_access wikiPageWikiLinkText "random-access".
- Random_access wikiPageWikiLinkText "randomly accessed".
- Random_access wikiPageWikiLinkText "table indexing".
- Random_access hasPhotoCollection Random_access.
- Random_access wikiPageUsesTemplate Template:Refimprove.
- Random_access wikiPageUsesTemplate Template:Reflist.
- Random_access subject Category:Computer_data.
- Random_access hypernym Ability.
- Random_access type Article.
- Random_access type Disease.
- Random_access type Article.
- Random_access type Datum.
- Random_access comment "In computer science, random access (more precisely and more generally called direct access) is the ability to access an item of data at any given coordinates in a population of addressable elements. As a rule the assumption is that each element can be accessed roughly as easily and efficiently as any other, no matter how many elements may be in the set, nor how many coordinates may be available for addressing the data.".
- Random_access label "Random access".
- Random_access sameAs وصول_عشوائي.
- Random_access sameAs Accés_aleatori.
- Random_access sameAs Přímý_přístup.
- Random_access sameAs Wahlfreier_Zugriff.
- Random_access sameAs Acceso_aleatorio.
- Random_access sameAs Accès_direct.
- Random_access sameAs גישה_ישירה.
- Random_access sameAs Véletlen_elérés.
- Random_access sameAs Accesso_casuale.
- Random_access sameAs ランダムアクセス.
- Random_access sameAs 임의_접근.
- Random_access sameAs Acesso_aleatório.
- Random_access sameAs m.06d42.
- Random_access sameAs Acces_aleatoriu.
- Random_access sameAs Произвольный_доступ.
- Random_access sameAs Насумичан_приступ_подацима.
- Random_access sameAs การเข้าถึงโดยสุ่ม.
- Random_access sameAs تصادفی_رسائی.
- Random_access sameAs Q218825.
- Random_access sameAs Q218825.
- Random_access sameAs 隨機存取.
- Random_access wasDerivedFrom Random_access?oldid=680431445.
- Random_access depiction Random_vs_sequential_access.svg.
- Random_access isPrimaryTopicOf Random_access.