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#' converts matrix to 'databel'
#'
#' Converts regular R matrix to \code{\linkS4class{databel}} object.
#' This is the procedure used by "as" converting to DatABEL objects,
#' in which case a temporary file name is created
#'
#' @param from R matrix
#' @param filename which FILEVECTOR BASE file name to use
#' @param cachesizeMb cache size to be used when accessing the object
#' @param type type of data to use for storage ("DOUBLE", "FLOAT", "INT",
#' "UNSIGNED_INT", "UNSIGNED_SHORT_INT", "SHORT_INT", "CHAR", "UNSIGNED_CHAR")
#' @param readonly whether to generate new 'databel' in read only mode
#'
#' @return object of class \code{\linkS4class{databel}}
#'
#' @author Yurii Aulchenko
#' @export
#'
matrix2databel <- function(from, filename, cachesizeMb = 64, type =
"DOUBLE", readonly = FALSE) {
# a bit dirty
to <- make_empty_fvf(as.character(filename),
nvariables=dim(from)[2],
nobservations=dim(from)[1],
type=type,
readonly=FALSE,
cachesizeMb=cachesizeMb)
to[] <- from
matrix_dimnames <- dimnames(from)
if (!is.null(matrix_dimnames)) {
set_dimnames(to) <- matrix_dimnames
}
setReadOnly(to) <- readonly
return(to)
}
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