[Rd] Recursion error after upgrade to R_2.11.1 [Sec=Unclassified]

Troy Robertson Troy.Robertson at aad.gov.au
Tue Oct 5 01:25:21 CEST 2010

Resending this in plain text, after realising the html text hadn't been posted (oops).

Hi all,

After an upgrade from R_2.10.1 to R_2.11.1 I am now getting the following error:
Error: evaluation nested too deeply: infinite recursion / options(expressions=)?

This occurs in the initialize method of S4 classes where I was initialising attributes eg:
.Object[['realtimeState']] <- list()

I can mostly avoid this new error by altering the code to do:
.Object$realtimeState <- list() OR .Object at .xData$realtimeState <- list()

But there are also times when I need to do .Object[realtimeState] <- list(NULL) in order to specifically set it to NULL (rather than have it removed) which I think is also causing me grief.

My classes all extend .environment and store all non-static data as per above (in environment .xData slot) rather than in normal class slots because I am able to achieve much quicker execution times without all the copy-on-change cost that results from passing these objects containing large amounts of slot-based data.

Can anyone provide a reason for the changes that have brought about the recursion issue?

Is there a better way to achieve the pass-by-reference style objects I am after?




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