R help - Aug 2006 - NLME: Limitations of using identify to interact with scatterplots?

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

Most plotting functions in the nlme package use lattice graphics
functions based on the grid package.  Identify will not work with
lattice graphics.  I'm not sure if there is a replacement.

On 8/17/06, Greg Distiller <gregd at stats.uct.ac.za>
wrote:
> 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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