[R] how exactly does 'identify' work?

[casperyc]

Hi all,

#########################################
test=data.frame(x=1:26,y=-23.5+0.45*(1:26)+rnorm(26))
rownames(test)=LETTERS[1:26]
attach(test)
#test
test.lm=lm(y~x)

plot(test.lm,2)
identify(test.lm$res,,row.names(test))
# not working

plot(x,y)
identify(x,y,row.names(test))
# works fine
identify(y,,row.names(test))
# works fine
identify(x,,row.names(test))
# not working
identify(y,,y)
# works
identify(x,,y)
# not working

#####################################

My guess is that identify take the object 'x' ( the first argument ) is the
thing that on the y axis.

However, i have tried many many ways 
trying to get the LETTERS to be identified in the QQ-plot (plot(test.lm,2))
it never works.....

I have even tried to extract the standardized residual using library(MASS),
the 'stdres' function, and put it as the first argument in identify,
still failed...

Is there any means to achieve this?

Thanks!

casper
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