R help - Apr 2012 - Ternaryplot as an inset graph

Hello

I am trying to add a ternary plot as a corner inset graph to a larger
main ternary plot. I have successfully used add.scatter in the past for
different kinds of plots but It doesn't seem to work for this particular
function. It overlays the old plot rather than plotting as an inset.

Here is a simple version of what I'm trying. Note that if I change the
inset plot to be an ordinary scatter, for instance, it works as
expected.

library(ade4)
library(vcd)
tdat <- data.frame(x=runif(20), y=rlnorm(20), z=rlnorm(20))
insetPlot <- function(data){
  ternaryplot(data)
}
ternaryplot(tdat)
add.scatter(insetPlot(tdat), posi="topleft", ratio=.2)

Thanks very much,

Jennifer Young
Fisheries and Oceans Canada
Jennifer.Young@dfo-mpo.gc.ca


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Young, Jennifer A <Jennifer.Young <at> dfo-mpo.gc.ca> writes:
> I am trying to add a ternary plot as a corner inset graph to a larger
> main ternary plot. I have successfully used add.scatter in the past for
> different kinds of plots but It doesn't seem to work for this
particular
> function. It overlays the old plot rather than plotting as an inset.
> 
> Here is a simple version of what I'm trying. Note that if I change the
> inset plot to be an ordinary scatter, for instance, it works as
> expected.
> 
> library(ade4)
> library(vcd)
> tdat <- data.frame(x=runif(20), y=rlnorm(20), z=rlnorm(20))
> insetPlot <- function(data){
>   ternaryplot(data)
> }
> ternaryplot(tdat)
> add.scatter(insetPlot(tdat), posi="topleft", ratio=.2)
> 
  I think the problem is that add.scatter assumes you're using base
graphics, while ternaryplot() uses grid graphics.  Mixing and
matching grid+base graphs is a little bit tricky.  You might try it with
triax.plot() from the plotrix package, which I believe does ternary
plots in base graphics ...

  Ben Bolker