reversals <- function(x) {
rv <- x[x$is_maxima | x$is_minima, ]
rv$prior_is_maxima <- c(NA,rv$is_maxima[1:nrow(rv)-1])
rv$prior_is_minima <- c(NA,rv$is_minima[2:nrow(rv)-1])
rv <- rv[(rv$is_maxima != rv$prior_is_maxima & rv$is_minima != rv$prior_is_minima) | is.na(rv$prior_is_maxima), ]
rv <- rv[ , c(1:4)]
row.names(rv) <- c(1:nrow(rv))
return(rv)
}
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