# farey

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##### Farey sequences

Returns the Farey sequence of order $n$

Keywords
array
##### Usage
farey(n, print=FALSE, give.series = FALSE)
##### Arguments
n

Order of Farey sequence

print

Boolean, with TRUE meaning to print out the text version of the Farey sequence in human-readable form. Default value of FALSE means not to print anything

give.series

Boolean, with TRUE meaning to return the series explicitly, and default FALSE meaning to return a 3 dimensional array as detailed below

##### Details

If give.series takes its default value of FALSE, return a matrix a of dimension c(2,u) where u is a (complicated) function of n. If v <- a[i,], then v[1]/v[2] is the $i^{\mathrm{th}}$ term of the Farey sequence. Note that det(a[(n):(n+1),])== -1

If give.series is TRUE, then return a matrix a of size c(4,u-1). If v <- a[i,], then v[1]/v[2] and v[3]/v[4] are successive pairs of the Farey sequence. Note that det(matrix(a[,i],2,2))== -1

##### References

G. H. Hardy and E. M. Wright 1985. An introduction to the theory of numbers, Oxford University Press (fifth edition)

unimodular

• farey
##### Examples
# NOT RUN {
farey(3)
# }

Documentation reproduced from package elliptic, version 1.4-0, License: GPL-2

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