[R] plot question

[Gabor Grothendieck]

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!