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rotates
2000 Mar 30
1
Efficiency of local functions
...n f1) local to f1. In that way I
pass one argument less to f2, a huge matrix. (This matrix isn't changed
inside f2, so - afaik - it is passed by reference and size doesn't matter.)
Still I would have expected that f1 would be a little faster, but the
opposit happened:
system.time(
rs <- rotateSegment(im, 272, 234, 100, 72, 51, 21)
)
(where rotateSegment is f1)
gave
> + + [1] 12.13 0.05 12.31 0.00 0.00 ## f2 extern of f1
> + + [1] 12.29 0.02 12.46 0.00 0.00 ## f2 local to f1
(I tried several times and got always similar results. I am using Linux,
Red Hat 6.1)
Doe...