[R] Line graphs with NA

[Gabor Grothendieck]

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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