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Was (wer) ist function digit - definition
![The ten digits of the [[Arabic numerals]], in order of value.](https://commons.wikimedia.org/wiki/Special:FilePath/Hindu-Arabic numerals.svg?width=200 "The ten digits of the [[Arabic numerals]], in order of value.")
![Image shows the measurement procedure of dorsal digit length using [[vernier calipers]]. The hand is placed on the edge of a table so that fingers are rested on table while making an angle of 90 degrees to the palm.](https://commons.wikimedia.org/wiki/Special:FilePath/Hand photograph dorsal1 copy.jpg?width=200 "Image shows the measurement procedure of dorsal digit length using [[vernier calipers]]. The hand is placed on the edge of a table so that fingers are rested on table while making an angle of 90 degrees to the palm.")
Wikipedia
A spigot algorithm is an algorithm for computing the value of a transcendental number (such as π or e) that generates the digits of the number sequentially from left to right providing increasing precision as the algorithm proceeds. Spigot algorithms also aim to minimize the amount of intermediate storage required. The name comes from the sense of the word "spigot" for a tap or valve controlling the flow of a liquid. Spigot algorithms can be contrasted with algorithms that store and process complete numbers to produce successively more accurate approximations to the desired transcendental.
Interest in spigot algorithms was spurred in the early days of computational mathematics by extreme constraints on memory, and such an algorithm for calculating the digits of e appeared in a paper by Sale in 1968. In 1970, Abdali presented a more general algorithm to compute the sums of series in which the ratios of successive terms can be expressed as quotients of integer functions of term positions. This algorithm is applicable to many familiar series for trigonometric functions, logarithms, and transcendental numbers because these series satisfy the above condition. The name "spigot algorithm" seems to have been coined by Stanley Rabinowitz and Stan Wagon, whose algorithm for calculating the digits of π is sometimes referred to as "the spigot algorithm for π".
The spigot algorithm of Rabinowitz and Wagon is bounded, in the sense that the number of terms of the infinite series that will be processed must be specified in advance. The term "streaming algorithm" indicates an approach without this restriction. This allows the calculation to run indefinitely varying the amount of intermediate storage as the calculation progresses.
A variant of the spigot approach uses an algorithm which can be used to compute a single arbitrary digit of the transcendental without computing the preceding digits: an example is the Bailey–Borwein–Plouffe formula, a digit extraction algorithm for π which produces base 16 digits. The inevitable truncation of the underlying infinite series of the algorithm means that the accuracy of the result may be limited by the number of terms calculated.
