[R] as.Date / size of par

[Gabor Grothendieck]

Try this:

# test data
y <- 0:1000 # values
dd <- Sys.Date() + y # Dates

# create zoo object, aggregate it by year using last value and plot it
z <- zoo(y, dd)
yr <- function(x) as.POSIXlt(x)$year + 1900
# or,  yr <- function(x) as.numeric(format(x, "%Y"))
z.yr <- aggregate(z, yr, tail, 1)
plot(z.yr, type = "o")

Also see R News 4/1 help desk article for more on dates and
see the zoo vignette for more on zoo:
library(zoo)
vignette("zoo")


On 4/17/06, Stefan Semmeling <trittihn at web.de> wrote:
> dear list,
>
> i have a problem plotting revenue against the date.
> the str. of date looks like:
>
> Class 'Date'  num [1:10493] -3649 -3648 -3647 -3646 -3643 ...
>
> the head looks like:
>
> [1] "1960-01-05" "1960-01-06" "1960-01-07" "1960-01-08" "1960-01-11"
> [6] "1960-01-12"
>
> i´d like to plot it against the years, but can´t figure out how that works.
>
> an other problem is the size of par.
> i want to put two graphics in one sheet. that works just fine.
> but when i tried to scale the entire sheet i failed.
>
> layout(matrix(c(1,2)), heights = c(4,3))
>
> is what i got, but i want the height to be longer than the width
> of the entire graphical output.
>
> any help is wellcome :-)
>
> thank you
>
> stefan
>
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