#' Dataframe Viewing
#'
#' \code{htruncdf} - Convenience function to view the head of a truncated
#' dataframe.
#'
#' @param dataframe A data.frame object.
#' @param n Number of rows to display.
#' @param width The width of the columns to be displayed.
#' @param end The last character to be displayed (width).
#' @param begin The first character to be displayed (width).
#' @param \ldots Other arguments passed to \code{\link[qdap]{htruncdf}}
#' (\code{\link[qdap]{qview}}; \code{\link[qdap]{ltruncdf}}) or
#' \code{\link[utils]{head}} (\code{\link[qdap]{htruncdf}}).
#' @rdname data_viewing
#' @return \code{htrundf} - returns n number of rows of a truncated dataframe.
#' @seealso \code{\link[utils]{head}}
#' @export
#' @examples
#' htruncdf(raj)
#' htruncdf(raj, 20)
#' htruncdf(raj, ,20)
#' truncdf(raj[1:10, ])
#' truncdf(raj[1:10, ], 40)
#' qview(raj)
#' qview(CO2)
htruncdf <-
function(dataframe, n=10, width=10, ...) {
head(truncdf(as.data.frame(dataframe), width), n = n, ...)
}
#' Truncated Dataframe Viewing
#'
#' \code{truncdf} - Convenience function to view a truncated dataframe.
#'
#' @return \code{trundf} - returns a truncated dataframe.
#' @rdname data_viewing
#' @export
truncdf <-
function(dataframe, end=10, begin=1) {
x <- as.data.frame(dataframe)
DF <- data.frame(lapply(x, substr, begin, end), check.names=FALSE)
names(DF) <- substring(names(DF), begin, end)
DF
}
#' List of Dataframes Viewing
#'
#' \code{ltruncdf} - Convenience function to view the head of a list of
#' truncated dataframes.
#'
#' @param dat.list A list of data.frame objects.
#' @return \code{ltruncdf} - returns a list of n number of rows of a truncated
#' dataframes.
#' @rdname data_viewing
#' @export
ltruncdf <- function(dat.list, n = 6, width = 10, ...) {
lapply(dat.list, htruncdf, n = n, width = width, ...)
}
#' Summary Dataframe Viewing
#'
#' \code{qview} - Convenience function to view a summary and head of a dataframe.
#'
#' @return \code{qview} - returns a dataframe head with summary statistics.
#' @rdname data_viewing
#' @export
qview <-
function(dataframe, ...){
x <- as.character(substitute(dataframe))
y <- paste(rep("=", 72), collapse="")
z <- paste("nrow = ",nrow(dataframe), " ncol = ",
ncol(dataframe), " ", x, collapse="")
cat(paste(y, z, y, sep = "\n")); cat("\n")
return(htruncdf(dataframe, ...))
}
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