On 24/02/2011 7:38 AM, Christos Delivorias wrote:
I'm trying to plot some temporal data that have some gaps in them. You
can see the plot here: http://www.tiikoni.com/tis/view/?id=da222e2.
The problem is that during the time gaps in the TS the line plot is
interpolated over the gap and I don't want it to. I've tried
interleaving the gaps with an NA flag, but there are around 10000
data-points sorted from multiple files, that makes it difficult to add
the NA flag manually. If it's not possible to define the behaviour of
the plot(0function, is there another plot I can use, e.g. zoo, that will
allow me to not have the lines drawn between the gaps?
Any software is going to have the same problem you had: how do you
define a gap? If the definition is something simple like "time
difference greater than X", then it will be fairly easy: use diff() to
find all the time differences in the sorted times, and wherever those
exceed X, insert a new data point with an NA value. For example,
t <- c(1,2,3,7,8,9,11,12,13)
x <- rnorm(length(T))
d <- diff(t)
gap <- which(d > 1.5)
if (length(gap)) {
newT <- (t[gap] + t[gap+1])/2
t <- c(t, newT)
x <- c(x, rep(NA, length(newT)))
o <- order(t)
t <- t[o]
x <- x[o]
}
plot(t, x, type='l')
Duncan Murdoch
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