The dashed line can be added to the plot with a call to "lines" after removing the NAs from your x/y vectors (I'm assuming 'missing' means NA).
> plot(x,y,type='l') > lines(x[!is.na(y)],y[!is.na(y)],lty=2) Vertical lines can be accomplished with "segments". norm -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Tuesday, May 24, 2005 1:39 PM To: r-help@stat.math.ethz.ch Subject: [R] Missing Data Line Type? I have a general question. Is there a setting that can be used for a multiple line type? The situation is that I want a solid line between x and y points but if the y point is missing, I want a dashed line type to the next point. In other words, if point 1 to 2 exists, make that line solid, otherwise, make it dashed up to the next existing x/y point. Additionally, what plot type would you recommend for a plot with two Y points per X? The two points would be joined by a vertical line. The average of the two is the dual type line described above. mailto:[EMAIL PROTECTED] Kenneth Ray Hobson, P.E. Oklahoma DOT - QA & IAS Manager 200 N.E. 21st Street Oklahoma City, OK 73105-3204 (405) 522-4985, (405) 522-0552 fax Visit our website at: http://www.okladot.state.ok.us/materials/materials.htm ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html