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

[David Forrest]

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)

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/