[Rd] [R] "infinite recursion" in do.call when lme4 loaded only

[Martin Maechler]

>>>>> "MM" == Martin Maechler <maechler at stat.math.ethz.ch>
>>>>>     on Fri, 13 Jan 2006 12:24:51 +0100 writes:

>>>>> "Dieter" == Dieter Menne <dieter.menne at menne-biomed.de>
>>>>>     on Thu, 12 Jan 2006 18:14:32 +0000 (UTC) writes:

    Dieter> Peter Dalgaard <p.dalgaard <at> biostat.ku.dk> writes:
    >>> > A larg program which worked with lme4/R about a year ago failed when I
    >>> > re-run it today. I reproduced the problem with the program below.

    >>> > -- When lme4 is loaded (but never used), the do.call fails
    >>> >    with infinite recursion after 60 seconds. Memory used increases
    >>> >    beyond bonds in task manager.
    >>> 
    >>> However, it surely has to do with methods dispatch:
    >>> 
    >>> > system.time(do.call("rbind.data.frame",caScore))
    >>> [1] 0.99 0.00 0.99 0.00 0.00
    >>> 
    >>> which provides you with another workaround.

    Dieter> Peter, I had increased the optional value already, but I still don't understand 
    Dieter> what this recursion overflow has to do with the lm4 loading.

    MM> Aahh, you've hit a secret ;-)  no, but a semi-hidden feature:
    MM> lme4 loads Matrix and Matrix  activates versions of rbind() and
    MM> cbind() which use rbind2/cbind2 which are S4 generics and
    MM> default methods that are slightly different than then the
    MM> original base rbind() and cbind(). 
    MM> This was a necessity since the original rbind(), cbind() have
    MM> first argument "...", i.e. an invalid signature for S4 method
    MM> dispatch.

    MM> This was in NEWS for R 2.2.0 :

    MM> o	Experimental versions of cbind() and rbind() in methods package,
    MM> based on new generic function cbind2(x,y) and rbind2().	 This will
    MM> allow the equivalent of S4 methods for cbind() and rbind() ---
    MM> currently only after an explicit activation call, see ?cbind2.

    MM> And 'Matrix' uses the activation call in its .OnLoad hook.
    MM> This is now getting much too technical to explain for R-help, so
    MM> if we want to go there, we should move this topic to R-devel,
    MM> and I'd like to do so, and will be glad if you can provide more
    MM> details on how exactly you're using rbind.

One thing -- very useful for you -- I forgot to add:

You can easily quickly revert the  "other cbind/rbind
activation" by using

    methods:::bind_activation(FALSE)

so you don't need to unload lme4 or Matrix,  and you can
reactivate them again after your special computation by

    methods:::bind_activation(on = TRUE)

Martin