Try this. na.approx fills in missing values. See
?na.approx, ?approx and ?plot.zoo and the
three zoo vignettes.
Lines <- 'Subject: 1 2 3 4
"1" NA 3 2 NA
"2" 4 NA NA 4
"3" 6 6.5 6 5.5
"4" 7 NA NA 7
"5" NA 8 7.5 NA'
DF <- read.table(textConnection(Lines), header = TRUE)
library(zoo)
z <- zoo(as.matrix(DF[-1]))
plot(na.approx(z, rule = 2), screen = 1, type = "o", pch = 20)
On Sun, Dec 28, 2008 at 1:39 PM, Chris Poliquin <poliquin at
sas.upenn.edu> wrote:> Hi,
>
> I have sets of three points provided by subjects that I want to graph as
> lines over a specific range, but the subjects were split into two groups
and
> provided different points. The subjects provided a y-value for the given
> x-value, for example:
>
> Subject: 1 2 3 4 ... 127
> "1" NA 3 2 NA ...
> "2" 4 NA NA 4
> "3" 6 6.5 6 5.5
> "4" 7 NA NA 7
> "5" NA 8 7.5 NA
>
> Using matplot() or xyplot() I can easily get R to plot the lines for
> subjects 1 and 4, but R wont draw lines connecting the points for subjects
2
> and 3 since there are missing values. I want R to just connect the points
> for B and C as if the missing values don't matter and make it look as
if
> each subject provided 5 points. What is the best way to do this?
>
> - Chris
>
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