Line graphs with NA
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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