Well, let me have a crack at it ... (inline below)
Bert Gunter Genentech Nonclinical Statistics -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Rolf Turner Sent: Monday, November 12, 2007 2:16 PM To: r-help@r-project.org Subject: [R] Tick mark puzzle. I am bewildered by the behaviour of tickmarks as demonstrated by the following code. (What I'm trying to do is draw a single tick mark extending from the axis all the way down to the tick label, which is two lines from the axis to make sure it doesn't overlap with the ``ordinary'' tick labels.) # Try 1: # Gap between tickmark and label. plot(1:10) axis(side = 1, at = 2.35, labels = "2.35", tick = TRUE, tcl=1,line=1,col="red", col.axis = "red") readline('Go? ') ## From the first line position, below the plotting region (line =1) the tick mark is ## drawn up 1 line height of text to the 0 position at the edge of the plotting region ## The label is drawn below the line =1 position, leaving the gap # Try 2: # Gap between tickmark and axis. plot(1:10) axis(side = 1, at = 2.35, labels = "2.35", tick = TRUE, tcl=-1,line=1,col="red", col.axis = "red") readline('Go? ') ## From the first line position one line height below the graph the tick mark is drawn down to where ## the label is located, leaving the gap between tick mark and graph boundary. # Try 3: # Gap between tickmark and label not filled. plot(1:10) axis(side = 1, at = 2.35, labels = "2.35", tick = TRUE, tcl=1,line=1,col="red", col.axis = "red") axis(side = 1, at = 2.35, labels ="", tick = TRUE, tcl=-1,col="red") readline('Go? ') ## First axis command as in Try 1. Second command uses default line = 0 = edge of plot region ## and so redraws tick the "other way" (down instead of up; try the second axis it in a different ## color and you'll see it overplot the tick in the different color) # Try 4: # Gap between tickmark and label ***is*** filled. # Gives what I want, but ***why***? plot(1:10) axis(side = 1, at = 2.35, labels = "2.35", tick = TRUE, tcl=-1,line=1,col="red", col.axis = "red") axis(side = 1, at = 2.35, labels ="", tick = TRUE, tcl=-1,col="red") ## Well you should be able to figure this one out now, right ... ;-) Cheers, Bert ______________________________________________ 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.
