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Encyclopedia > Random access
Random access compared to sequential access.
Random access compared to sequential access.

In computer science, random access (sometimes called direct access) is the ability to access an arbitrary element of a sequence in equal time. The opposite is sequential access, where a remote element takes longer time to access. 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 (random: can be immediately flipped open to any random page. A more modern example is a cassette tape (sequential—you have to fast-forward through earlier songs to get to later ones) and a compact disc (random access—you can jump right to the track you want). The term random access memory (RAM), however, is used for semiconductor chip memory circuits used in computers. (The term was also used to describe ferrite-core memory in early computers). In computer science sequential access means that a group of elements (e. ... Computer science, or computing science, is the study of the theoretical foundations of information and computation and their implementation and application in computer systems. ... This is a page about mathematics. ... In computer science sequential access means that a group of elements (e. ... A scroll is a roll of parchment, papyrus, or paper which has been written upon. ... For other uses, see Book (disambiguation). ... Look up Page in Wiktionary, the free dictionary Page may mean: In graphic design, typography, or printing: Page header, typography Page footer, typography Page (paper), a leaf or one side of a leaf, as of a book An apprentice, assistant or errand boy: Page (servant), a servant or knights... RAM redirects here. ... A 16 16 cm area core memory plane of 128 128 bits, i. ...


In data structures, random access implies the ability to access the Nth entry in a list of numbers in constant time. Very few data structures can guarantee this, other than arrays (and related structures like dynamic arrays). Random access is critical to many algorithms such as quicksort and binary search. Other data structures, such as linked lists, sacrifice random access to make for efficient inserts, deletes, or searches. A binary tree, a simple type of branching linked data structure. ... For the microarray in genetics, see SNP array. ... A dynamic array, growable array, resizable array, dynamic table, or array list is a data structure, an array which is automatically expanded to accommodate new objects if filled beyond its current size. ... Q sort redirects here. ... In computer science, binary search or binary chop is a search algorithm for finding a particular value in a linear array, by ruling out half of the data at each step. ... In computer science, a linked list is one of the fundamental data structures, and can be used to implement other data structures. ...


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Random access - Wikipedia, the free encyclopedia (193 words)
In computer science, random access is the ability to access a random element of a group in equal time.
The term random access memory (RAM), however, is used for semiconductor chip memory circuits used in computers.
Random access is critical to many algorithms such as quicksort and binary search.
Random access memory - Wikipedia, the free encyclopedia (1009 words)
Random access memory (sometimes random-access memory), commonly known by its acronym RAM, is a type of computer storage (in practice only computer chips) whose contents can be accessed in any (i.e., random) order.
One defining characteristic of RAM is that its accesses to different memory locations are almost always completed at about the same speed, in contrast to some other technologies that required a certain delay time for a bit or byte to “come around”.
Core memory, which used wires attached to small ferrite electromagnetic cores, also had roughly equal access time (the term “core” is still used by some programmers to describe the RAM at the heart of a computer).
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