Hi Sorn,

thanks for your code. I guess I didn't really made myself very clear.
What I sort of looking for is a xyplot with both the x axis at the bottom
and y axis at the
left going through 0, but continuing  in the positive and negative area
(forming a kind of cross
like e.g.
http://upload.wikimedia.org/wikipedia/commons/thumb/2/2c/Erf_plot.svg/600px-Erf_plot.svg.png

I'm not sure if this possible at all or if I just have to add to reference
lines at x=0 and y =0 as a
workaround even though not fully satisfying...?

Thanks,

       Katharina

2009/6/18 <Sorn.Norng@dpi.vic.gov.au>

>
> Hi Katharina,
>
> Look at using scales - here is an example of my code
>
>
> xyplot(SA~Dates,data=dm,type="b",cex=1.5,col=2,
> xlab=list(label="Sampling dates",cex=2.0),
> ylab=list(label="Total dry matter (t/ha)",cex=2.0),
> *scales=list(cex=1.2, tck=c(1,0), x = list(rot = 90)) *
> )
>
>
> Cheers
>
> Sorn
>
>  scales list determining how the x- and y-axes (tick marks and labels) are
> drawn. The list contains parameters in name=value form, and may also
> contain two other lists called x and y of the same form (described below).
> Components of x and y affect the respective axes only, while those in
> scales affect both. When parameters are specified in both lists, the
> values in x or y are used. Note that certain high-level functions have
> defaults that are specific to a particular axis (e.g., bwplot has
> alternating=FALSE for the y-axis only); these can be overridden only by an
> entry in the corresponding component of scales.
> The possible components are :
> relation
> character string that determines how axis limits are calculated for each
> panel. Possible values are "same" (default), "free" and "sliced". For
> relation="same", the same limits, usually large enough to encompass all
> the data, are used for all the panels. For relation="free", limits for
> each panel is determined by just the points in that panel. Behavior for
> relation="sliced" is similar, except that the length (max - min) of the
> scales are constrained to remain the same across panels.
> The determination of what axis limits are suitable for each panel can be
> controlled by the prepanel function, which can be overridden by xlim, ylimor
> scales$limits. If relation is not "same", the value of xlim etc is
> normally ignored, except when it is a list, in which case it is treated as
> if its components were the limit values obtained from the prepanel
> calculations for each panel.
> tick.number
> Suggested number of ticks (ignored for a factor, shingle or character
> vector, in which case there is no natural rule for leaving out some of the
> labels. But see xlim).
> draw
> logical, defaults to TRUE, whether to draw the axis at all.
> alternating
> logical specifying whether axis labels should alternate from one side of
> the group of panels to the other. For finer control, alternating can be a
> vector (replicated to be as long as the number of rows or columns per page)
> consisting of the following numbers
>
>    - 0: do not draw tick labels
>    - 1: bottom/left
>    - 2: top/right
>    - 3: both.
>
> alternating applies only when relation="same". The default is TRUE, or
> equivalently, c(1, 2)
> limits
> same as xlim and ylim.
> at
> location of tick marks along the axis (in native coordinates), or a list as
> long as the number of panels describing tick locations for each panel.
> labels
> Labels (strings or expressions) to go along with at. Can be a list like atas well.
> cex
> numeric multiplier to control character sizes for axis labels. Can be a
> vector of length 2, to control left/bottom and right/top separately.
> font, fontface, fontfamily
> specifies font for axis labels.
> tck
> numeric to control length of tick marks. Can be a vector of length 2, to
> control left/bottom and right/top separately.
> col
> color of ticks and labels.
> rot
> Angle by which the axis labels are to be rotated. Can be a vector of length
> 2, to control left/bottom and right/top separately.
> abbreviate
> logical, whether to abbreviate the labels using abbreviate. Can be useful
> for long labels (e.g., in factors), especially on the x-axis.
> minlength
> argument passed to abbreviate if abbreviate=TRUE.
> log
> Controls whether the corresponding variable (x or y) will be log
> transformed before being passed to the panel function. Defaults to FALSE,
> in which case the data are not transformed. Other possible values are any
> number that works as a base for taking logarithm, TRUE (which is
> equivalent to 10), and "e" (for the natural logarithm). As a side effect,
> the corresponding axis is labeled differently. Note that this is a
> transformation of the data, not the axes. Other than the axis labeling,
> using this feature is no different than transforming the data in the
> formula; e.g., scales=list(x = list(log = 2)) is equivalent to y ~ log2(x).
>
> format
> the format to use for POSIXct variables. See strptime for description of
> valid values.
> axs
> character, "r" or "i". In the latter case, the axis limits are calculated
> as the exact data range, instead of being padded on either side. (May not
> always work as expected.)
>
>
>
> ----------------------------------------------------------
> Sorn Norng
> Biometrician
> Department of Primary Industries
> Knoxfield Centre
> 621 Burwood Highway, Ferntree Gully 3156
> Ph: (03) 9210 9358
> Mob: 0428344515
> Fax: (03) 9800 3521
> Email: sorn.norng@dpi.vic.gov.au
>
> -----------------------------------------------------------------------------
>
>
>
>  *Katharina May <may.katharina@googlemail.com>*
> Sent by: r-help-bounces@r-project.org
>
> 17/06/2009 07:24 PM
>   To
> r-help@r-project.org  cc
>   Subject
> [R] lattice: axis ticks, axis alignment and remove axis from plot
>
>
>
>
> Hi there,
>
> I'm a bit confused concerning the axis tck setting in the lattice
> package as the ticks on left sided axis aren't
> drawn at all with the following setting:
>
> dados <- data.frame(varsep = factor(rep(1:2,10)),
>                    i = runif(20))
>
> library(lattice)
>
> my.theme <- list(
>        axis.components = list(left = list(tck = 1, pad1 = 1, pad2 =
> 2), top = list(tck = 0, pad1 = 1, pad2 = 0), right = list(tck = 0,
> pad1 = 1, pad2 = 0), bottom = list(tck = +0.5, pad1 = 1, pad2 = 2)))
>
> trellis.par.set(theme = my.theme)
>
>
> bwplot(varsep ~ i, dados,
>       xlab = names(dados)[1],
>       ylab = names(dados)[2],
>       panel = function(...) {
>                         panel.grid(v = -1, h = 0)
>                         panel.bwplot(...)
>       })
>
>
>
> Maybe somebody can help me recognise the problem why the left sided
> ticks are not drawn.
>
> I'm also wondering how to tell the trellis object not to draw the
> right and top axes at all an how to align the y axis
> that it goes through x=0?
>
> Thanks,
>
>        Katharina
>
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