[R] High/low level: Plot 2 time series with different axis (left and right)

[Petr Pikal]

   Hi

   On 14 Mar 2004 at 18:04, Jan Verbesselt wrote:

   > Dear R specialists,

   >

   > I have two time series in a data.frame and want to plot them in the

   > same plot(), with the left axis scaled to time series 1 (-700,0) and

   > the right axis scaled to time series 2 (-0.2, 0.4).

   >

   > plot(timeserie1)

   > lines(timeserie2, col=c(2)) => this one should be scaled differently

   > with a new axis on the right handside.

   I am not really a R specialist but for this task I use function:

   plot.yy<-function(x,yright,yleft, yleftlim=NULL, yrightlim = NULL,
   xlab = NULL ,yylab=c("",""),pch=c(1,2),col=c(1,2), linky=F, smooth=0,
   lwds=1, length=10, format="%d-%H:%M", ...)

   {

   par(mar=c(5,4,4,2),oma=c(0,0,0,3))

   plot(x, yright, ylim=yrightlim, axes=F,ylab="", xlab=xlab,
   pch=pch[1],col=col[1], ...)

   axis(4,pretty(range(yright,na.rm=T),10),col=col[1])

   if (linky) lines(x,yright,col=col[1], ...)

   if (smooth!=0) lines(supsmu(x,yright,span=smooth),col=col[1],
   lwd=lwds, ...)

   if(yylab[1]=="")

   mtext(deparse(substitute(yright)),side=4,outer=T,line=1, col=col[1],
   ...)

   else

   mtext(yylab[1],side=4,outer=T,line=1, col=col[1], ...)

   par(new=T)

   plot(x,yleft, ylim=yleftlim, ylab="", axes=F ,xlab=xlab,
   pch=pch[2],col=col[2], ...)

   box()

   axis(2,pretty(range(yleft,na.rm=T),10),col=col[2], col.axis=col[2])

   if (is.null(class(x))) axis(1,pretty(range(x,na.rm=T),10)) else

   {

   l<-length(x)

   axis(1,at=x[seq(1,l,length=length)],labels=format(as.POSIXct(x[seq(1,l
   ,length=length)]),format=format))

   }

   if(yylab[2]=="")

   mtext(deparse(substitute(yleft)),side=2,line=2, col=col[2], ...)

   else

   mtext(yylab[2],side=2,line=2, col=col[2], ...)

   if (linky) lines(x,yleft,col=col[2], lty=2, ...)

   if (smooth!=0) lines(supsmu(x,yleft,span=smooth),col=col[2], lty=2,
   lwd=lwds, ...)

   }

   ### End of a function

   It gives you a limited possibility to do some smoothing, add lines
   change colors and points and add some axes annotation and it handels x
   in POSIX class }just a little bit :).

   Cheers

   Petr

   >

   > How can these be visualised such that the fit is optimal for

   > visualisation of the two time series? Which commands can I use?

   >

   > Thanks,

   > Jan

   >

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   Petr Pikal

   petr.pikal at precheza.cz