[R] noob requesting help

[capital_P]

Rui Barradas wrote
> 
> It's stringsAsFactors = FALSE, just one '='.
> 
> sapply(dat, length)
> 
> It should return 4 times the value 34773. 
> 
> use dput() 
> 

it worked!

> dat2 <- data.frame(dat, stringsAsFactors = FALSE)

> sapply(dat2, length)
device_info_serial               hour               time 
             34773              34773              34773 
            tripID 
             34773 

> dput(head(dat2, 20))
structure(list(device_info_serial = c(121L, 121L, 121L, 121L, 
121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 121L, 
121L, 121L, 121L, 121L, 121L), hour = c(10L, 11L, 11L, 11L, 11L, 
11L, 11L, 11L, 11L, 11L, 11L, 11L, 12L, 12L, 12L, 12L, 12L, 12L, 
12L, 13L), time = structure(c(1242896364, 1242896671, 1242897111, 
1242897399, 1242897686, 1242897978, 1242898281, 1242898589, 1242898916, 
1242899253, 1242899542, 1242899835, 1242901122, 1242901902, 1242902199, 
1242902489, 1242902807, 1242903096, 1242903402, 1242903708), class =
c("POSIXct", 
"POSIXt"), tzone = ""), tripID = c(3L, 3L, 3L, 3L, 3L, 3L, 3L, 
3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L)), .Names =
c("device_info_serial", 
"hour", "time", "tripID"), row.names = c(NA, 20L), class = "data.frame")
> 

> departures <- lapply(split(dat2, list(dat2$device_info_serial,
> dat2$tripID)), function(x) x[x$time == min(x$time),])

Now I have a new problem:

I need to make a histogram of the hours (in this case, their time of
departure), for the whole population and for each bird seperately.

Before, I used this: 

hist(active$hour, breaks = 24, xlim=c(0,24))

and:

b121 <- active[which(active$device_info_serial == 121),]
b130 <- active[which(active$device_info_serial == 130),]
b132 <- active[which(active$device_info_serial == 132),]
b133 <- active[which(active$device_info_serial == 133),]
etc.

But now there are no departures$device_info_serial or departures$hour,
because departures is a list, not a data frame.

I've tried:

> dep <- data.frame(departures, stringsAsFactors = FALSE)
Error in data.frame(`121.1` = list(device_info_serial = integer(0), hour =
integer(0),  : 
  arguments imply differing number of rows: 0, 1, 2

> dep <- data.frame(departures)
Error in data.frame(`121.1` = list(device_info_serial = integer(0), hour =
integer(0),  : 
  arguments imply differing number of rows: 0, 1, 2

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