[R-SIG-Finance] plot log scale on y axis using zoo object (with plot.zoo)

[Gabor Grothendieck]

If the warning bothers you try this:

suppressWarnings(plot(z,log="y"))

or this:

plot(log10(z), yaxt = "n")
axis(2, at = axTicks(2), lab = 10^axTicks(2))


On Wed, Mar 31, 2010 at 3:40 PM, Pierre Lapointe <pierrelap at gmail.com> wrote:
> Hi,
>
> I'd like to plot a times series with a log on the y-axis. I'm plotting a zoo
> object as it is easier to format the dates on the x-axis. Unfortunately,
> log="y" does not work with plot.zoo. Any idea?
>
> Here's a reproducible example
>
> x <-seq(1,10000,length.out=10)
> plot(x,log="y",type="l")  #works
>
> z <- zoo(seq(1,10000,length.out=10),
>     as.Date(c("1992-01-10", "1992-01-17", "1992-01-24", "1992-01-31",
>       "1992-02-07", "1992-02-14", "1992-02-21", "1992-02-28", "1992-03-06",
>       "1992-03-13")))
> plot(z,log="y")          #gives error
>
> #Warning message:
> #In plot.xy(xy.coords(x, y), type = type, ...) :
> #  "log" is not a graphical parameter
>
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>
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