[R] Showing time progression on (triangle) plots

Jim Lemon jim at bitwrit.com.au
Wed Jul 29 14:16:15 CEST 2009


JS Walker wrote:
> Hi,
>
> I have made some nice triangle plots showing the projected airborne, 
> landborne and oceanborne fraction of anthropogenic emitted carbon 
> dioxide at 10 year intervals for the next century.
>
> Currently all ten points on my plot are identical so I can't 
> distinguish between them. I would like to be able to track the trend 
> as the century progresses.
>
> How can I show the time progression on the plot (I was thinking a 
> gradual colour, character type or character size change)?
>
>
> Thanks for the help
>
>
> Jim
>
>
>
>
> The code I have used for the plot uses 'plotrix' (thanks to the 
> Bristol mirror):
>
> Fractions <-matrix(c(LF10,AF10,OF10), ncol=3)
> colnames(Fractions, do.NULL = TRUE, prefix="col")
> colnames(Fractions) <- c("Landborne fraction", "Airborne fraction", 
> "Oceanborne fraction")
> library(plotrix)
> triax.plot(x=Fractions,main="Where do anthropogenic emissions 
> reside?",at=seq(0.1,0.9,by=0.1),axis.labels=NULL, 
> tick.labels=NULL,col.axis="black",cex.axis=1,cex.ticks=1,align.labels=TRUE,show.grid=TRUE,col.grid="gray",lty.grid=par("lty"),cc.axes=FALSE,show.legend=FALSE,label.points=FALSE,point.labels=NULL,col.symbols="2",pch=par("pch"),no.add=TRUE) 
>
>
>
Hi Jim,
Have a look at the third example on the triax.plot help page, in 
particular the col.symbols argument.

Jim




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