Hi, this might also work for You:
> points(example.df$StartDate[ (row(example.df)%%5)==0 ], example.df$DSR2[ (row(example.df)%%5)==0 ], type="p", pch=3) > points(example.df$StartDate[ (row(example.df)%%5)==0 ], example.df$DSR2[ (row(example.df)%%5)==0 ], type="p", pch=3) Kind regads, Kimmo Jessi Brown wrote (21.02.2008): > Hello, fellow R enthusiasts. > > Ok, I've been racking my brain about this small issue, and between > searching the help archives and reading through the plot-related > documentation, I can't figure out how to achieve my desired endpoint > without some ugly, brute force coding. > > What I would like to do is make a plot in which only a subset of my > data are plotted, but in regular intervals, such as every 5th point > along the sequence. Is anyone aware of a built-in function in plot or > a related graphing family that can do this, or alternatively, a > simple way to extract the desired rows from my original dataframe? I > want to do this because I want to plot multiple series of points with > their confidence intervals (arrows), and even if I specify type="b," > the output ends up looking like just a series of crowded points. > > For example, if you try making the plot below, you will see how > > crowded two lines look without error bars: > > example.df<-data.frame(StartDate=(94:157), DSR1=seq(0.4, 0.8, > > length.out=64), DSR2=seq(0.3, 0.9, length.out=64)) > > plot(example.df$StartDate, example.df$DSR1, type="b", > > ylim=c(0.3,0.9)) points(example.df$StartDate, example.df$DSR2, > > type="b", pch=3) > > Any ideas for an elegant solution to my dilemma? > > Thanks in advance for any help. > > cheers, Jessi Brown > > Ph.D. student > Program in Ecology, Evolution, and Conservation Biology > University of Nevada, Reno > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html and provide commented, > minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
