Prof Brian Ripley <[EMAIL PROTECTED]> writes:
> The usual 'trick' to avoid this copy is
>
> storage.mode(x) <- "double"
Hmm, this does not appear to avoid the copy for me. Using R 2.5.0
alpha r40916 I get:
> x <- 1:10 * 2.3
> names(x)=LETTERS[1:10]
> storage.mode(x)
[1] "double"
> tracemem(x)
[1] "<0x2a7f008>"
> storage.mode(x) <- "double"
tracemem[0x2a7f008 -> 0x1fa6df8]:
Note that actually changing the storage results in a surprising amount
of copying:
> storage.mode(x) <- "integer"
tracemem[0x1fa6df8 -> 0x1fa6d60]:
tracemem[0x1fa6d60 -> 0x1fa6808]: as.integer.default as.integer eval eval
storage.mode<-
tracemem[0x1fa6808 -> 0x2c26b18]: as.integer.default as.integer eval eval
storage.mode<-
tracemem[0x2c26b18 -> 0x2c26a88]: storage.mode<-
+ seth
--
Seth Falcon | Computational Biology | Fred Hutchinson Cancer Research Center
http://bioconductor.org
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