R help - May 2008 - Spacing between lattice panels

I'm trying to set up a lattice plot with two y-axes for each panel.  (Yes, 
I know that multiple y-axes are generally a bad idea; the graph is for 
someone else and they want it that way.)  I've used a custom 
yscale.component in xyplot to achieve this:

myyscale.component <- function(...)
{
  ans <- yscale.components.default(...)
  ans$right <- ans$left
  foo <- ans$right$labels$at
  ans$right$labels$labels <- as.character(10*foo)
  ans 
}

xyplot(Sepal.Length ~ Petal.Length| Species, data = iris, scales = 
list(y=list(relation="free", alternating=3, rot=0)), 
yscale.component=myyscale.component)
 
The problem is that the panels are too close together.  This appears to be 
because (according to the help documentation) xyplot ignores the 
alternating argument when relation is not "same".  I presume that
manually
setting some plotting parameters with trellis.par.set() will allow me to 
adjust the spacing between the panels, though I can't figure out which 
ones to change.

Is there a way to get lattice to properly space the panels, or failing 
that, how do I manually space them?

Regards,
Richie.

Mathematical Sciences Unit
HSL


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ATTENTION:

This message contains privileged and confidential inform...{{dropped:20}}

On 5/6/08, Richard.Cotton at hsl.gov.uk <Richard.Cotton at hsl.gov.uk>
wrote:
> I'm trying to set up a lattice plot with two y-axes for each panel. 
(Yes,
>  I know that multiple y-axes are generally a bad idea; the graph is for
>  someone else and they want it that way.)  I've used a custom
>  yscale.component in xyplot to achieve this:
>
>  myyscale.component <- function(...)
>  {
>   ans <- yscale.components.default(...)
>   ans$right <- ans$left
>   foo <- ans$right$labels$at
>   ans$right$labels$labels <- as.character(10*foo)
>   ans
>  }
>
>  xyplot(Sepal.Length ~ Petal.Length| Species, data = iris, scales > 
list(y=list(relation="free", alternating=3, rot=0)),
>  yscale.component=myyscale.component)
>
>  The problem is that the panels are too close together.  This appears to be
>  because (according to the help documentation) xyplot ignores the
>  alternating argument when relation is not "same".  I presume
that manually
>  setting some plotting parameters with trellis.par.set() will allow me to
>  adjust the spacing between the panels, though I can't figure out which
>  ones to change.
>
>  Is there a way to get lattice to properly space the panels,
No.
> or failing that, how do I manually space them?
The space between panels can be controlled using the 'between'
argument. You additionally need some space at the right, for which you
need to set a width component. E.g.,

xyplot(Sepal.Length ~ Petal.Length| Species, data = iris,
      scales = list(y=list(relation="free", alternating=3, rot=0)),
      yscale.component=myyscale.component,
      between = list(x = 2),
      par.settings = list(layout.widths = list(right.padding = 5)))

The full list of components of 'layout.widths' is given by

names(trellis.par.get("layout.widths"))

-Deepayan