[R] build interval

Hello, I have some question on chron I currently doing this t1 <- chron(,"11:30:00") t2 <- chron(,"11:45:00") tt <- seq(t1,t2,by=times("00:00:01")) tt has 901 values (15 minutes * 60 secs) and then x1 <- rnorm(1:901) x2 <- rnorm(1:901) x3 <- rnorm(1:901) df <- data.frame(tt, x1, x2, x3) I

[R] Repeating value occurence

How can achieve this in R using seq, or rep function c(-1,0,1,0,-1,0,1,0,-1,0) The range value is between-1 and 1, and I want it such that there could be n number of points between -1 and 1 Anyone? Please help Thanks Rusty [[alternative HTML version deleted]] _

[R] Interpolate xts

Hello, I have a xts object, I would like to fill the NA with linear interpolated data. Can anyone please help. > str(zz) An ‘xts’ object from 2010-11-24 15:59:29 to 2010-11-24 16:00:00 containing: Data: num [1:23401, 1] 312 312 312 312 312 ... Indexed by objects of class: [POSIXct,POSI

[R] POSIXct issue

Hello I have trouble getting my original datetime back see below. I hope I am missing something. Please help. > tt <- as.POSIXct("2011-01-07 07:49:13", tz="EST") > tt [1] "2011-01-07 07:49:13 EST" > ttn <- as.numeric(tt) > ttn [1] 1294404553 > tt <- as.POSIXct(ttn,origin='1970-01-01',tz="EST") >

[R] Interpolation

Hello, I am new to R and need some help. I have data in following format DATA matrix DateTime oh l c 2009-01-01 07:30:00 2 3 4 5 2009-01-01 07:33:00 4 2 5 7 I am able to fill the gap using combination of seq and chron 2009-0