[R] Plotting with exact axis limits

From: Enrico Rossi <enrico.a.rossi_at_gmail.com>
Date: Mon, 14 Apr 2008 18:56:58 -0400


Hello,

If I make a plot, say something simple like

plot( runif(100) )

then the origin (0,0) is not at the bottom-left corner of the box surrounding the plot. The axis limits are "padded" slightly. This is ordinarily a good feature, because it makes plots look better. But now I would like to make a plot with the origin exactly on the bottom left. Through trial and error, I have discovered that this padding is approximately 3.8% of the axis length. That is,

plot( runif(100), ylim=c(.038,1), xlim=c(3.8,100))

gives the desired result. However, this seems like a rather inelegant hack. Is there a "correct" way to do this?

Thank you!
Enrico

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