[R] NLME: Limitations of using identify to interact with scatterplots?
Greg Distiller
gregd at stats.uct.ac.za
Thu Aug 17 11:01:38 CEST 2006
I have a quick question regarding the use of identify to interact with
points on a scatterplot. My question is essentially: can identify be used
when one is plotting model objects to generate diagnostic plots?
Specifically I am using NLME.
For example, I am plotting the fitted values on the x axis vs a variable
called log2game with the following code:
plot(D2C29.nlme, log2game ~ fitted(.), abline=c(0,1))
and then I have tried to use identify as follows:
identify(D2C29.nlme$fitted[,2],Data2$log2game,row.names(Data2))
(if I leave out the [,2] on the fitted attributes then I am told that x and
y are not the same length and it appears that this is due to the fact that
the fitted attribute has 2 columns.)
but I get an error message that "plot.new has not been called yet".
I am not sure if this is because I am doing something wrong or if identify
simply cannot be used in this context.
Many thanks
Greg
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