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#' Municipality counter
#'
#' Count the municipalities for a set of dates. Either at the national or
#' cantonal level. See vignette for details.
#'
#' @param mutations A tibble containing the municipality mutations inventory
#' (see \code{\link{import_CH_municipality_inventory}})
#' @param dates A \link{Date} object vector
#' @param geo_level Either "ch" or "cantons".
#'
#' @return A tibble with the municipality count per date and specified
#' geography.
#'
#' @export
municipality_counter <- function(mutations, dates, geo_level = "ch") {
mutations_no_lakes <- filter(mutations, !(bfs_nr >= 9000 & bfs_nr < 10000))
if (geo_level == "ch") {
result <- rep(NA, length(dates))
for (ii in 1:length(dates)) {
result[ii] <- nrow(filter_date(mutations_no_lakes, date = dates[ii]))
}
t_result <- tibble(date = dates, n = result)
} else if (geo_level == "cantons") {
result <- list()
for (ii in 1:length(dates)) {
result[[ii]] <- filter_date(mutations_no_lakes, date = dates[ii]) %>%
group_by(canton) %>%
summarise(n = n()) %>% add_column(date = dates[ii], .before = 1)
}
t_result <- bind_rows(result)
} else {
stop("Invalid geo level input")
}
return(t_result)
}
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