R help - Apr 2004 - plot question

I have a variable named "Medicine" which has seven values in date
format, on the following plot, how can I use a red line to indicate the time
when the medicine was taken on x axis?
 
The following is my original plot of blood pressure vs. time. 
plot(time,
bloodpressure,xlab="Time",ylab="bPress",main="Time VS
Blood Pressure", type="l", xaxt="n")
 r <- as.POSIXct(round(range(Time), "days"))
 axis.POSIXct(1, at=seq(r[1], r[2], by="day"),
format="%d-%b")
 
Thanks a lot!




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plot(1:10)
abline(v=c(3,5,7), col="red")


Linda portman <lindaportman <at> yahoo.com> writes:

: 
: I have a variable named "Medicine" which has seven values in date
format, on
the following plot, how can I use
: a red line to indicate the time when the medicine was taken on x axis?
: 
: The following is my original plot of blood pressure vs. time. 
: plot(time,
bloodpressure,xlab="Time",ylab="bPress",main="Time VS
Blood
Pressure", type="l", xaxt="n")
:  r <- as.POSIXct(round(range(Time), "days"))
:  axis.POSIXct(1, at=seq(r[1], r[2], by="day"),
format="%d-%b")
: 
: Thanks a lot!