On Fri, 7 Jul 2006, Martin Morgan wrote:
> sapply calls lapply as
>
> answer <- lapply(as.list(X), FUN, ...)
>
> which, when X is a list, causes X to be duplicated unnecessarily. The
> coercion is unnecessary for other mode(X) because in lapply we have
>
> if (!is.list(X)) X <- as.list(X)
That looks reasonable.
> More generally, perhaps as.vector might not duplicate when mode(x) == mode ?
>
This isn't a trivial change, because mode(x)==mode does not guarantee
that as.vector(x, mode) has no effect. For example, with mode="numeric" it
removes attributes.
-thomas
Thomas Lumley Assoc. Professor, Biostatistics
[EMAIL PROTECTED] University of Washington, Seattle
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