[R] zero margin / marginless plots (in lattice?)

[David Forrest]

On Thu, 11 Jan 2007, David Forrest wrote:

> Thanks.  The xaxs|yaxs='i' works well for the base graphics.  Is there an
> additional parameter in play for lattice graphics?  The closest I could
> gotten is the below which still leaves a bit of a margin:
>
> xy<-data.frame(x=c(0,1,1,0,0),y=c(0,1,0,0,1))
> xyplot(y~x,xy,scales=list(axs='i',draw=FALSE),type='l',xlab=NULL,ylab=NULL)

Hi again,

If there isn't a way to completely eliminate the margins in lattice/grid 
plots, is there a way to find the graphic device extents as measured in 
data coordinates?

Dave


>
> Dave
>
> On Wed, 10 Jan 2007, Marc Schwartz wrote:
>
>> On Wed, 2007-01-10 at 21:18 -0600, David Forrest wrote:
>>> Hi,
>>>
>>> I'd like to produce a marginless or zero margin plot so that the pixel
>>> coordinates represent the mathematics.
>>>
>>> xy<-data.frame(x=c(0,1,1,0,0),y=c(0,1,0,0,1))
>>> png('junk.png',width=300,height=300)
>>> par(mar=c(0,0,0,0))
>>> plot(xy$x,xy$y,xlim=c(0,1),ylim=c(,1))
>>> dev.off()
>>>
>>> The resultant file has about a 10 pixel margin around these lines, and I'm
>>> not sure what parameter or function is controlling this offset.  Any
>>> hints?
>>>
>>> Thanks for your time,
>>> Dave
>>
>> By default, the axis ranges are extended by +/- 4%.  You can change this
>> by using:
>>
>>  plot(xy$x, xy$y, xlim = c(0, 1), ylim = c(0, 1),
>>       xaxs = "i", yaxs = "i")
>>
>> where 'xaxs' and 'yaxs' set the axis ranges to the actual data ranges.
>>
>> See ?par for more information.
>>
>> HTH,
>>
>> Marc Schwartz
>>
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>>
>
>

-- 
  Dr. David Forrest
  drf at vims.edu                                    (804)684-7900w
  drf5n at maplepark.com                             (804)642-0662h
                                    http://maplepark.com/~drf5n/