#' Function to return the RA5 hydrologic indicator statistic for a given data frame
#'
#' This function accepts a data frame that contains a column named "discharge" and calculates
#' RA5; Number of day rises. Compute the number of days in which the flow is greater than the previous day. RA5
#' is the number of positive gain days divided by the total number of days in the flow record (dimensionless-spatial).
#'
#' @param qfiletempf data frame containing a "discharge" column containing daily flow values
#' @return ra5 numeric containing RA5 for the given data frame
#' @export
#' @examples
#' qfiletempf<-sampleData
#' ra5(qfiletempf)
ra5 <- function(qfiletempf) {
sub_length <- nrow(qfiletempf)-1
counter <- 0
for (i in 1:sub_length) {
if (qfiletempf$discharge[i+1] - qfiletempf$discharge[i] > 0) {
counter <- counter+1
}
}
ra5 <- counter/(sub_length+1)
return(ra5)
}
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