#' Determine the validity of a \code{zoocat} Object
#'
#' Determine the validity of a "\code{zoocat}" object.
#'
#' @usage isvalid(x)
#' @param x a \code{zoocat} object.
#' @return a logic variable.
#' @examples
#'
#' x <- matrix(1 : 20, nrow = 5)
#' colAttr <- data.frame(month = c(2, 3, 5, 6), name = 'sst')
#' zc <- zoocat(x, order.by = 1991 : 1995, colattr = colAttr)
#' isvalid(zc)
#'
#' @export
#' @name isvalid
#' @rdname isvalid
isvalid <- function (x) {
UseMethod('isvalid')
}
#' @export
#' @rdname isvalid
isvalid.zoocat <- function (x) {
if (length(x) == 0) {
cat('empty zoocat\n')
return(1)
}
isV <- 1
cAttr <- attr(x, 'cattr')
if (!is.matrix(cAttr) & !is.data.frame(cAttr)) {
cat('The cattr must be matrix or dataframe.\n')
isV <- 0
} else {
if (nrow(cAttr) != ncol(x)) {
cat('The dimension of cattr is incorrect.\n')
isV <- 0
}
if (is.null(colnames(cAttr))) {
cat('The cattr has no colnames.\n')
isV <- 0
}
}
return(isV)
}
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