Non-standard positional numeral systems

Mixed radix

Mixed radix numeral systems are non-standard positional numeral systems in which the numerical base varies from position to position. Such numerical representation applies when a quantity is expressed using a sequence of units that are each a multiple of the next smaller one, but not by the same factor. Such units are common for instance in measuring time; a time of 32 weeks, 5 days, 7 hours, 45 minutes, 15 seconds, and 500 milliseconds might be expressed as a number of minutes in mixed-radix notation as: ... 32, 5, 7, 45; 15, 500... ∞, 7, 24, 60; 60, 1000 or as 32∞577244560.15605001000 In the tabular format, the digits are written above their base, and a semicolon indicates the radix point. In numeral format, each digit has its associated base attached as a subscript, and the radix point is marked by a full stop or period. The base for each digit is the number of corresponding units that make up the next larger unit. As a consequence there is no base (written as ∞) for the first (most significant) digit, since here the "next larger unit" does not exist (and note that one could not add a larger unit of "month" or "year" to the sequence of units, as they are not integer multiples of "week"). (Wikipedia).

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Related pages

Permutation | Radix | Sexagesimal | The Art of Computer Programming | Decimal | Non-standard positional numeral systems | Quaternary numeral system | Cooley–Tukey FFT algorithm | Factorial | Vigesimal | United States customary units | Radix point | Numeral system | Mathematical induction | Duodecimal