You can use: lines(x[!is.na[stu.vector], stu.vector[!is.na(stu.vector)], lty=1, col='blue')
-Don At 1:43 PM -0400 7/1/05, Doran, Harold wrote: >Dear List: > >I am generating a series of plots iteratively using Sweave. In short, a >dataframe is subsetted row by row and variable graphics are created >conditional on the data in each row. In this particular case, this code >ends up generating 17,000 individual plots. > >In some cases, all student data (this is working with student >achievement data) are available and my code below works very well in the >sense that a line connects all points. However, in some cases there are >missing data and I need to modify my code so that lines are connected >through all points even when data are missing. > >Here is a snip of relevant code. In the actual program, the data in >stu.vector and avg.vector are obtained from the dataframe as the >programs loops through each row. > >stu.vector<-c(2500, 2510, NA , 2600) >avg.vector<-c(2635, 2589, 2628, 2685) >x <- c(0,1,2,3) >graph.min <- min(stu.vector,avg.vector ,na.rm=TRUE)-150 >graph.max <- max(stu.vector,avg.vector ,na.rm=TRUE)+150 >plot(x, stu.vector, ylim=c(graph.min,graph.max), xlab=" ", ylab="Scaled >Score", xaxt='n', pch=2, col='blue', main="Math Growth Rate") >points(x, avg.vector, pch=1, col='red') >lines(x, stu.vector, lty=1, col='blue') >lines(x, avg.vector, lty=3, col='red') > >If the NA did not exist in the object stu.vector then all points would >be connected with lines. However, in some cases data are missing and I >need to connect the data in stu.vector with lines. So in this case, the >line would connect points 1 and 2, and then 2 and 4 even though point 3 >is missing. > >Can anyone suggest how I might do this? > >Thanks, >Harold > > > [[alternative HTML version deleted]] > >______________________________________________ >[email protected] mailing list >https://stat.ethz.ch/mailman/listinfo/r-help >PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html -- -------------------------------------- Don MacQueen Environmental Protection Department Lawrence Livermore National Laboratory Livermore, CA, USA ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
