| # File src/library/base/R/rle.R |
| # Part of the R package, https://www.R-project.org |
| # |
| # Copyright (C) 1995-2014 The R Core Team |
| # |
| # This program is free software; you can redistribute it and/or modify |
| # it under the terms of the GNU General Public License as published by |
| # the Free Software Foundation; either version 2 of the License, or |
| # (at your option) any later version. |
| # |
| # This program is distributed in the hope that it will be useful, |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| # GNU General Public License for more details. |
| # |
| # A copy of the GNU General Public License is available at |
| # https://www.R-project.org/Licenses/ |
| |
| rle <- function(x) |
| { |
| if (!is.vector(x) && !is.list(x)) |
| stop("'x' must be a vector of an atomic type") |
| n <- length(x) |
| if (n == 0L) |
| return(structure(list(lengths = integer(), values = x), |
| class = "rle")) |
| y <- x[-1L] != x[-n] |
| i <- c(which(y | is.na(y)), n) |
| structure(list(lengths = diff(c(0L, i)), values = x[i]), |
| class = "rle") |
| } |
| |
| print.rle <- function(x, digits = getOption("digits"), prefix = "", ...) |
| { |
| if(is.null(digits)) digits <- getOption("digits") |
| cat("", "Run Length Encoding\n", " lengths:", sep=prefix) |
| utils::str(x$lengths) |
| cat("", " values :", sep=prefix) |
| utils::str(x$values, digits.d = digits) |
| invisible(x) |
| } |
| |
| inverse.rle <- function(x, ...) |
| { |
| if(is.null(le <- x$lengths) || |
| is.null(v <- x$values) || length(le) != length(v)) |
| stop("invalid 'rle' structure") |
| rep.int(v, le) |
| } |