[R] Selecting timestamps

[Lauri Nikkinen]

R-users,

I have two vectors (of timestamps)

d1 <- as.POSIXct(strptime("2.2.2002 07:00", format="%d.%m.%Y %H:%M"))
d2 <- as.POSIXct(strptime("4.2.2002 07:00", format="%d.%m.%Y %H:%M"))
seq1 <- seq(d1, d2, "hours")
seq1

d3 <- as.POSIXct(strptime("2.2.2002 15:22", format="%d.%m.%Y %H:%M"))
d4 <- as.POSIXct(strptime("3.2.2002 18:12", format="%d.%m.%Y %H:%M"))
seq2 <- seq(d3, d4, "hours")
seq2

How to select timestamps from seq1 which are just before and after of
particular timestamp in seq2?
The resulting vector should look like this in this example:

"2002-02-02 15:00:00 Normaaliaika"
"2002-02-02 16:00:00 Normaaliaika"
"2002-02-02 16:00:00 Normaaliaika"
"2002-02-02 17:00:00 Normaaliaika"
"2002-02-02 17:00:00 Normaaliaika"
"2002-02-02 18:00:00 Normaaliaika"
"2002-02-02 18:00:00 Normaaliaika"
etc.

Thank you,
Lauri


> sessionInfo()
R version 2.6.0 (2007-10-03)
i386-pc-mingw32

locale:
LC_COLLATE=Finnish_Finland.1252;LC_CTYPE=Finnish_Finland.1252;LC_MONETARY=Finnish_Finland.1252;LC_NUMERIC=C;LC_TIME=Finnish_Finland.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] RODBC_1.2-3

loaded via a namespace (and not attached):
[1] tools_2.6.0