Dear all,
let consider the following function:
Fun1 <- function() {
library(lattice)
plot1 <- 1:10~1:10
pl1 <- xyplot(plot1)
return(pl1$call$x)
}
In R 2.5.0 (or older version) we have
> Fun1()
plot1
but starting from R 2.5.1 until the latest R 2.8.0 we obtain instead
> Fun1()
NULL
because pl1$call seems to be equal to xyplot() without arguments.
Something like xyplot(x=plot1) doesn?t work either. Again we have that
pl1$call is equal to xyplot() without arguments
The situation is slightly different if we call the xyplot in the global
environment:
> plot1 <- 1:10~1:10
> pl1 <- xyplot(plot1)
> pl2 <- xyplot(x=plot1)
then we have
> pl1$call
xyplot(plot1)
> pl1$call$x
NULL
but at least
> pl2$call
xyplot(x = plot1)
> pl2$call$x
plot1
Someone knows if in R 2.8.0 it is possible to retrieve the name of the x
argument (i.e. plot1) directly from an object of class ?trellis? when the
corresponding lattice function (e.g. xyplot) is inside another function
(e.g. Fun1)?
Thanks in advance
Vincenzo
-----------------------------------------------------------------------------------
Vincenzo Luca Di Iorio
Consultant PME User support - GSK R&D Limited
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