We use a design iterator in BatchExperiments::makeDesign for a cartesian
product. I found a old version of designIterator (cf. <
https://github.com/tudo-r/BatchExperiments/blob/master/R/designs.R>) w/o
the optional data.frame input which is easier to read: <
https://gist.github.com/mllg/7469844>.
AFAIR the speed was decent. Major advantage is the low memory footprint.
Could easily be ported to a reference class and should run on arbitrary
objects with small modifications.
In parallel it might get tricky though. You could try to sequentially
request [n] elements of the iterator, chunk them to match [desired number
of jobs] and then parallelize. Or write a function which converts a single
integer to the respective integer vector "state" in above referenced gist
which is in my opinion much more flexible.
2013/11/14 Michael Lawrence <lawrence.mich...@gene.com>
> Hi guys,
>
> We often need to iterate over the cartesian product of two dimensions,
> like sample X chromosome. This is preferable to nested iteration, which is
> complicated. I've been using expand.grid and bpmapply for this, but it
> seems like this could be made easier. Like bpmapply could gain a CARTESIAN
> argument with a list of arguments to multiply? But somehow you would want
> the resuls combined in a way that does not require generating the product
> manually. Maybe a list of lists? We need to think more about the
> combination step, in general.
>
> Michael
>
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