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.
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