Hi,
I'm trying to plot a series of lines without data point markers, except
for the first data point in each line, which I want to also mark with an
open circle.
The following code accomplishes this for a single line:
xyplot(yy ~ xx,
panel=function(x, y){
panel.xyplot(x, y, col="black",type="l")
panel.xyplot(x[1], y[1], col="black",type="p")
})
However, I am trying to do this for every line for multiple lines in a
panel, with several panels created by a 'by()' function (I do not want a
grid of panels, I want separated panels).
expt1 is a dataframe with seven factor columns, and x,y data coordinates
in columns 8 and 9.
I can appropriately create the grouped lines (but without the single
data markers) with following code:
by(expt1,expt1[,3:4],function(q) xyplot(q[,9] ~ q[,8], groups=q[,2],
data=q, col="black", type="l"))
But I am stuck putting the two goals together because I can't figure out
how to get the group information to be properly passed to the custom
panel function above.
I suspect I may be going about this entirely the wrong way - I've been
using R for all of 4 hours...
Help appreciated.
Russell
--
Russell Wyeth
Biology, St Francis Xavier University
P.O. Box 5000 Antigonish, NS B2G 2W5 Canada
Shipping: 1 West St. Antigonish, NS B2G 2W5 Canada
http://people.stfx.ca/rwyeth/
Ph: 9028673886 Fx: 9028672389
Cell: 9023180250
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