I am trying to get a function written in R that calls a cascade of functions
from the graphics package, and I want to eventually call replacements to
functions in the graphics package instead of the originals. Specifically, I
have a function that calls qqnorm in stats, which calls qqnorm.default in
stats, which calls plot in graphics, which calls plot.default and plot.new, and
I want my own functions plot.default and plot.new that I entered at the command
line (which I guess means that it is in .GlobalEnv). I'd like my plot.default
and plot.new called (this afternoon, at least) in place of every invocation of
plot.default and plot.new resp.. So far I've tried:
reassignInPackage from R.utils:
reassignInPackage("plot.default","graphics",my.plot.default) gives "Error in
assignInNamespaceT(name, value, ns = pkgName, envir = env) : locked binding
of ‘plot.default’ cannot be changed", even after
unlockBinding("plot.default",as.environment("package:graphics"))
assignInNamespace seems to almost work. Here's what I enter:
plot.default<-function(...){cat("Entered plot.default")}
plot.new<-function(...){cat("Entered plot.new")}
assignInNamespace("plot.default",plot.default,ns="graphics")
assignInNamespace("plot.new",plot.new,ns="graphics")
qqnorm(1:10)
and here's what I get:
Entered plot.newError in plot.xy(xy, type, ...) : plot.new has not been called
yet
It seems as though my new plot.new is being called, but the existing
plot.default is being called, even though the new version is in
graphics::plot.default. I conjecture that this is because the original
plot.default got exported when the package loaded, but is there a
way to overwrite this? Thanks, John
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