[R] tickmarks with time in dotplots

Phil Spector spector at stat.berkeley.edu
Tue Feb 23 00:22:23 CET 2010

Mikkel -
    Suppose you want tick marks at every half hour:

ticks = seq(as.POSIXct('2010-02-22 12:00:00 PST'),
             as.POSIXct('2010-02-22 17:00:00 PST'),by='30 min')
dotplot(Name ~ Time, data = C, horizontal = TRUE,scales=list(x=list(at=ticks)))

Hope this helps.
 					- Phil Spector
 					 Statistical Computing Facility
 					 Department of Statistics
 					 UC Berkeley
 					 spector at stat.berkeley.edu

On Mon, 22 Feb 2010, Mikkel Grum wrote:

> Hi,
> I'm drawing lattice dotplots with time along the x-axis as in:
> C <-data.frame(c("A", "B"),Sys.time()+ rnorm(50)*3600)
> names(C) <- c("Name", "Time")
> dotplot(Name ~ Time, data = C, horizontal = TRUE)
> On my display, the x-axis shows tick marks every two hours. I would like to show something more frequent; at least every hour, possibly more often. I've tried many variants of my understanding of the syntax in the help file, but I'm not making progress.
> Any suggestions?
> All suggestions greatly appreciated.
> Mikkel
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