[R] Problems with labeling a set X axis in chron plots

[David Winsemius]

On Feb 16, 2009, at 6:11 PM, Neotropical bat risk assessments wrote:

> I am having difficulties getting the X-axis labels (dates) to be as  
> needed when plotting from chron
>
> The help syntax from chron lists this example:
>
> x <- chron(dates = c("02/27/92", "02/27/92", "01/14/92", "02/28/92"),

On my machine I'm reasonably sure the R interpreter would respond to  
that input with a new line and a "+".
>
>
>
> I have activity plots by time on the y-axis and the dates on the x- 
> axis. What I need/want is that the dates remain the same for a give  
> set of data i.e. 10/25/2006 to 03/30/2007 as with some data sets  
> within this time frame there is no activity for all of the dates so  
> each plot has a different set of dates.

The actual code would be sooo helpful here.

>
>
>
> Below works great but when I try to constrain the dates it crashes...

"Constrain the dates" means  ... what?

And it seems very doubtful that the error message was anything like "I  
crashed".

Sign me perplexed;
David Winsemius

>
>
> DF <- read.table(textConnection(Lines), header = TRUE, as.is = TRUE)
> DF$Date <- chron(DF$Date)
> DF$Time <- times(paste(DF$Time, 0, sep = ":"))
> at <- c(0, 1, 2, 3, 4, 5, 6, 17, 18, 19, 20, 21, 22, 23, 24)
> plot(Time ~ Date, DF, ylim = 0:1, yaxt = "n",main= "Centronycteris  
> centralis")
> axis(2, at/24, lab = paste(at, "00", sep = ":"), las = 1, cex.axis  
> = .7)
>
> Thanks to all here on the group,
>
> Bruce Miller
>
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