[R] Using dates on axis with Grid plots

From: Larry White <ljw1001_at_gmail.com>
Date: Sat, 14 May 2011 10:01:15 -0400


Hi,

I'm trying to use Grid plots and would like to have an X axis that represents dates. I have several years of data so I would like to be able to have labeled tick marks only intermittently (not one per date). I can transform the initial data from a date time string into POSIXlt or POSIXct, or Date objects.

The issue is that when I try to layout the plot using:

dev.off()
  pushViewport(
    plotViewport(

      c(5, 5, 4, 2),
        xscale=c(
           min(foo),
           max(foo)),
           yscale=c(0,30)

    )
)

I get this error, regardless of whether "foo" is formated as POSIXlt, POSIXct or Date for the xscale.

Error in valid.viewport(x, y, width, height, just, gp, clip, xscale, yscale,  :
  Invalid 'xscale' in viewport

How does one specify the scale? In the end, I would prefer something like "2007 2008", etc. to appear on the axis and, of course, I'd actually want to plot the data with an x axis of dates. I'm not yet far enough to see if that's going to be an issue.

Apologies if this is a stupid question, but it's very hard to search for Grid examples on the web, because "grid" is a very common term in R plotting generally.

        [[alternative HTML version deleted]]



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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. Received on Sat 14 May 2011 - 14:47:36 GMT

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