[R] how to connect dots by passing NA

[Gabor Grothendieck]

Try this which interpolates the NAs using na.approx from zoo
drawing the interpolated series with lty=3 and then overwrites
solid lines with the gaps using lines.

library(zoo)
plot(y ~ x, as.data.frame(na.approx(zoo(cbind(x, y)))), lty = 3, type = "l")
lines(y ~ x)


On Wed, Apr 16, 2008 at 8:56 PM, DinoDragon <timd_huang at yahoo.com> wrote:
> This maybe a silly question. I'm trying to figure out a way to draw a line from a data set which contain NA. Say, I have a set of data as:
>
> x <- c(1.1 2.2 NA 4.4 5.5)  ; y <- c(1:5) # as x,y of point a, b, c, d, and e.
>
> I would like to plot this to a line by using dot-line to connect the two
> adjacent points before and after the NA, something like: (a)______(b)......(d)______(e)
>
> Any help will be very appreciated.
>
> --
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>
> Smiles,
>
> Timothy Huang 黃大ㄧ
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