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#' Check for missing files in array simulations
#'
#' Given the saved files from a \code{\link{runArraySimulation}} remote
#' evaluation check whether all \code{.rds} files have been saved. If missing
#' the missing row condition numbers will be returned.
#'
#' @param dir character vector input indicating the directory
#' containing the \code{.rds} files (see \code{files})
#'
#' @param files vector of file names referring to the saved simulation files.
#' E.g. \code{c('mysim-1.rds', 'mysim-2.rds', ...)}
#'
#' @param min minimum number after the \code{'-'} deliminator. Default is 1
#'
#' @param max maximum number after the \code{'-'} deliminator. If not specified
#' is extracted from the attributes in the first file
#'
#' @seealso \code{\link{runArraySimulation}}, \code{\link{SimCollect}}
#'
#' @return returns an invisible TRUE if all the files are present and FALSE otherwise
#'
#' @references
#'
#' Chalmers, R. P., & Adkins, M. C. (2020). Writing Effective and Reliable Monte Carlo Simulations
#' with the SimDesign Package. \code{The Quantitative Methods for Psychology, 16}(4), 248-280.
#' \doi{10.20982/tqmp.16.4.p248}
#'
#' @export
#'
#' @author Phil Chalmers \email{rphilip.chalmers@@gmail.com}
#'
#' @examples
#' \dontrun{
#'
#' # if files are in mysimfiles/ directory
#' SimCheck('mysimfiles')
#'
#' # specifying files explicility
#' setwd('mysimfiles/')
#' SimCheck(files=dir())
#'
#' }
#'
SimCheck <- function(dir = NULL, files = NULL, min = 1L, max = NULL){
if(is.null(dir) && is.null(files))
stop('either dir or files must be specified')
if(!is.null(dir) && !is.null(files))
stop('dir OR files must be specified, not both')
if(!is.null(dir)){
files <- dir(dir)
} else dir <- './'
files <- paste0(dir, files)
filename <- strsplit(files[1], '-')[[1L]][1L]
if(is.null(max)){
tmp <- readRDS(files[1])
max <- attr(tmp, 'extra_info')$number_of_conditions
}
minmax <- min:max
notin <- !(paste0(filename, '-', minmax, '.rds') %in% files)
if(any(notin)){
warning(sprintf('The following row conditions were missing:\n%s\n',
paste0(minmax[notin], collapse=',')))
}
nonzero <- sapply(files, file.size) > 0
if(any(!nonzero))
warning(sprintf('The following row conditions have nothing saved:\n%s\n',
paste0(minmax[!nonzero], collapse=',')))
invisible(any(notin) || any(nonzero))
}
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