Nothing

```
#' #Slices a data.frame containing date-time type columns.
#' @param x at dataframe
#' @param from a vector of lenght = participants
#' @param to a vector of lenght = participants
#' @param ... Optional parameters
#' @return a dataframe
#'
#' @details it does not include overlaps periods: periods that started (ended) before (after) start.period (end.period)
#'
#' @examples
#' library("lubridate")
#' start.period <- ymd_hms("2017-12-10 12:00:00")
#' end.period <- ymd_hms("2017-12-12 12:00:00")
#' portion(act[act$subject_ID==1,], from = start.period, to = end.period)
#'
#'
#' @export
#' @importFrom lubridate interval int_overlaps
#' @importFrom dplyr tbl_df filter
#'
portion <- function(x, from , to , ...){ #all = TRUE,
int <- NULL
#x <- data.frame(x)
part <- length(unique(x$subject_ID))
mat2 <- NULL
if(length(from) != length(to))
stop("the variables from and to must have same length ")
for (i in 1 : length(part)){
mat <- dplyr::filter(x, x$subject_ID == part[[i]], x$datime_start >= from[i], x$datime_end <= to[i] )
mat2 <- rbind(mat2 , mat)
}
mat2
}
#' Slices a data.frame containing date-time type columns including overlaping periods.
#'
#' @param x a dataframe
#' @param from a vector of lenght = participants
#' @param to a vector of lenght = participants
#' @param tz is the time zone
#' @param ... Optional parameters
#'
#' @return a dataframe
#'
#' @details it does include overlaps periods: periods that started (ended) before (after) start.period (end.period)
#'
#' @examples
#' library("lubridate")
#' start.period <- ymd_hms("2017-12-10 12:00:00")
#' end.period <- ymd_hms("2017-12-12 12:00:00")
#' portion_withoverlaps(act[act$subject_ID==1,], from = start.period, to = end.period)
#' @export
#' @importFrom lubridate interval int_overlaps
#' @importFrom dplyr filter select
# Slice a data.frame with overlaps
portion_withoverlaps <- function(x, from , to , tz = "UTC", ...){
int <- NULL
mat2 <- NULL
x <- tbl_df(x)
x$int <- lubridate::interval(x$datime_start,x$datime_end)
part <- as.vector(unique(x$subject_ID))
if(length(from) != length(to))
stop("the variables from and to must have same length ")
for (i in 1 : length(part)){
int2 <- lubridate::interval(from[i], to[i], tz = tz)
#mat <- dplyr::filter(x, x$subject_ID == part[[i]], lubridate::int_overlaps(x$int,int2) %in% c(TRUE, NA) )
mat <- x[ x$subject_ID == part[[i]] & lubridate::int_overlaps(x$int,int2) %in% c(TRUE, NA) ,]
mat <- mat %>% dplyr::select(-int)
mat2 <- rbind(mat2 , mat)
}
mat2
}
```

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