| % File src/library/base/man/sequence.Rd |
| % Part of the R package, https://www.R-project.org |
| % Copyright 1995-2007 R Core Team |
| % Distributed under GPL 2 or later |
| |
| \name{sequence} |
| \title{Create A Vector of Sequences} |
| \usage{ |
| sequence(nvec, \dots) |
| \method{sequence}{default}(nvec, from = 1L, by = 1L, \dots) |
| } |
| \alias{sequence} |
| \alias{sequence.default} |
| \arguments{ |
| \item{nvec}{coerced to a non-negative integer vector each element of which |
| specifies the length of a sequence.} |
| \item{from}{coerced to an integer vector each element of which |
| specifies the first element of a sequence.} |
| \item{by}{coerced to an integer vector each element of which |
| specifies the step size between elements of a sequence.} |
| \item{\dots}{additional arguments passed to methods.} |
| } |
| \description{ |
| The default method for \code{sequence} generates the sequence |
| \code{\link{seq}(from[i], by = by[i], length.out = nvec[i])} for each |
| element \code{i} in the parallel (and recycled) vectors \code{from}, |
| \code{by} and \code{nvec}. It then returns the result of concatenating |
| those sequences. |
| } |
| \details{ |
| Negative values are supported for \code{from} and |
| \code{by}. \code{sequence(nvec, from, by=0L)} is equivalent to |
| \code{rep(from, each=nvec)}. |
| |
| This function was originally implemented in R with fewer features, but |
| it has since become more flexible, and the default method is |
| implemented in C for speed. |
| } |
| \seealso{ |
| \code{\link{gl}}, \code{\link{seq}}, \code{\link{rep}}. |
| } |
| \author{Of the current version, Michael Lawrence based on code from the |
| S4Vectors Bioconductor package} |
| \examples{ |
| sequence(c(3, 2)) # the concatenated sequences 1:3 and 1:2. |
| #> [1] 1 2 3 1 2 |
| sequence(c(3, 2), from=2L) |
| #> [1] 2 3 4 2 3 |
| sequence(c(3, 2), from=2L, by=2L) |
| #> [1] 2 4 6 2 4 |
| sequence(c(3, 2), by=c(-1L, 1L)) |
| #> [1] 1 0 -1 1 2 |
| } |
| \keyword{manip} |