Re: [R] How to change min and max of plot axis

From: Duncan Murdoch <murdoch_at_stats.uwo.ca>
Date: Sat, 21 Jun 2008 11:32:01 -0400

On 21/06/2008 11:25 AM, Luis Orlindo Tedeschi wrote:
> All; this might be an easy question but I cannot make it work. I would
> like to set the min and max of the y axis of a plot. I know I have to
> use par("usr"), but after I do the plot() the axis values get changed.
>
> x<-rnorm(20)
> Y<-x+rnorm(20,0,.1)
> plot(y,x)
> par("usr")
>
> # let's say I have -2.8 1.15 -2.8 1.16 for par("usr")
> # let's say I need to change the Y-axis to be -5 to 5
>
> usr<-par("usr")
> par(usr=c(usr[1:2],-5,5))
> plot(y,x)
>
> # it does not take the -5 to 5???
>
> Is there any way to set the axis values?

plot() will set up the coordinate system. You can use the ylim argument to set the limits, e.g.

plot(y, x, ylim=c(-5,5))

(This is a little confusing, since the y variable ends up on the x axis and vice versa: the convention in R is plot(x, y).)

Duncan Murdoch



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