Making a picture that is wide and small height

How do I make a picture that is a horizontal strip? I tried

plot(x=c(1,2,3,4),y=c(1,1,1,1)) #works but screen image is square.
pdf("ratio.pdf",height=1,width=6)
plot(x=c(1,2,3,4),y=c(1,1,1,1))

I got the following error message:
Error in plot.new() : figure margins too large

Is it possible to produce an on-screen picture that is a horizontal strip?
(I use Mac Os X 10.4.11, and quartz().) What about pdf?

I have spent many hours trawling through the online help information and
this forum, without success. Where is this explained? 

Thanks for any help
David

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