[R] double-axis labels function of each other

[Jim Lemon]

Hi Hurr,
Try this:

par(mar=c(7,4,4,2))
plot(x1,x2,type="l",xlab="")
require(plotrix)
fullaxis(1,at=pretty(x1),labels=round(1/pretty(x1),2),tick=TRUE,
 col="red",col.axis="red",lwd=4,pos=-0.2)
mtext("x1",side=1,line=4.5)

Jim

On Fri, Apr 3, 2015 at 11:16 AM, Hurr <hill0093 at umn.edu> wrote:

> I have been doing other things, but want again to learn R.
> First some code:
>
> #try 2 axes at bottom
> x1 <- c(1,2,3,4,5,6,7,8,9)
> x2 <- c(5,1,9,6,3,7,8,2,4)
> plot(x1,x2,type="l") #scatter plot x1 on horizontal, x2 on vertical axis
> axis(1,labels=TRUE,tick=TRUE,col="red",col.axis="red",lwd=4,line=2.5)
>
> Some simple questions:
> 1)How do I make it put the value 1/HorizScaleValue at the lower axis ticks?
> 2)How do I give more space at the bottom for the lower axis?
> 3)How do I make the two X axes the same length?
>
>
>
>
> --
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