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#' Vector Tally of Mono-Syllabic Words By Grouping Variable(s)
#'
#' Mono-syllabic word tallies for the words in a vector of strings by grouping
#' variable(s).
#'
#' @param x A character vector.
#' @param group The grouping variable(s). Takes a single grouping variable or a list
#' of 1 or more grouping variables.
#' @param \ldots ignored.
#' @return Returns a \code{\link[base]{data.frame}}
#' (\code{\link[data.table]{data.table}}) of integer tallies for the total number of
#' mono syllable words for each string in the vector.
#' @family syllable functions
#' @export
#' @examples
#' dat <- data.frame(
#' text = c("I like chicken.", "I want eggs benedict for breakfast.", "Really?"),
#' group = c("A", "B", "A")
#' )
#' tally_mono_vector_by(dat$text, dat$group)
#'
#' with(presidential_debates_2012, tally_mono_vector_by(dialogue, person))
#' with(presidential_debates_2012, tally_mono_vector_by(dialogue, list(role, time)))
#' with(presidential_debates_2012, tally_mono_vector_by(dialogue, list(person, time)))
tally_mono_vector_by <- function(x, group, ...){
count <- element_id <- NULL
if (is.list(group) & length(group)>1) {
m <- unlist(as.character(substitute(group))[-1])
G <- sapply(strsplit(m, "$", fixed=TRUE), function(x) {
x[length(x)]
}
)
grouping <- group
} else {
G <- as.character(substitute(group))
G <- G[length(G)]
grouping <- unlist(group)
}
element_id <- add_row_id(count_row_length(x))
long_dat <- stats::setNames(as.data.frame(grouping, stringsAsFactors = FALSE),
G)[element_id, , drop = FALSE]
long_dat[["count"]] <- syllable_count_long_vector(x)
data.table::setDT(long_dat)
out <- long_dat[, list(n.words = length(stats::na.omit(count)),
mono = sum(count < 2, na.rm = TRUE)), keyby = G]
out
}
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