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look up table - Übersetzung nach griechisch
![Part of a 20th-century table of [[common logarithm]]s in the reference book [[Abramowitz and Stegun]].](https://commons.wikimedia.org/wiki/Special:FilePath/Abramowitz&Stegun.page97.agr.jpg?width=200 "Part of a 20th-century table of [[common logarithm]]s in the reference book [[Abramowitz and Stegun]].")
!["Table of Pythagoras" on [[Napier's bones]]<ref>[[Wikisource:Page:Popular Science Monthly Volume 26.djvu/467]]</ref>](https://commons.wikimedia.org/wiki/Special:FilePath/PSM V26 D467 Table of pythagoras on slats.jpg?width=200 "\"Table of Pythagoras\" on [[Napier's bones]]<ref>[[Wikisource:Page:Popular Science Monthly Volume 26.djvu/467]]</ref>")
![The [[Tsinghua Bamboo Slips]], Chinese [[Warring States]] era decimal multiplication table of 305 BC](https://commons.wikimedia.org/wiki/Special:FilePath/Qinghuajian, Suan Biao.jpg?width=200 "The [[Tsinghua Bamboo Slips]], Chinese [[Warring States]] era decimal multiplication table of 305 BC")
Definition
Wikipedia
In computer science, a lookup table (LUT) is an array that replaces runtime computation with a simpler array indexing operation. The savings in processing time can be significant, because retrieving a value from memory is often faster than carrying out an "expensive" computation or input/output operation. The tables may be precalculated and stored in static program storage, calculated (or "pre-fetched") as part of a program's initialization phase (memoization), or even stored in hardware in application-specific platforms. Lookup tables are also used extensively to validate input values by matching against a list of valid (or invalid) items in an array and, in some programming languages, may include pointer functions (or offsets to labels) to process the matching input. FPGAs also make extensive use of reconfigurable, hardware-implemented, lookup tables to provide programmable hardware functionality.
