R help - Feb 2010 - tickmarks with time in dotplots

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

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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