[R] Fast nested List->data.frame

[Dieter Menne]

Greg Hirson wrote:
> 
> I'd approach this by first making a matrix, then converting to a data 
> frame with appropriate types. 

Well, I knew that matrixes are faster for numerics, but I also knew that the
required conversion to character would be a show-stopper. My second wisdom
was bogus. Your version is 30% faster on my computer.

Dieter

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