[R] Ternaryplot as an inset graph

[Greg Snow]

The triplot function in the TeachingDemos package uses base graphics,
the subplot function (also in TeachingDemos) is another way to place a
plot within a plot (and triplot and subplot do work together).

If you want to stick to grid graphics then you can use viewports in
grid to insert one plot into another.

On Fri, Apr 20, 2012 at 10:05 AM, Ben Bolker <bbolker at gmail.com> wrote:
> 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
>
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-- 
Gregory (Greg) L. Snow Ph.D.
538280 at gmail.com