On Mon, 16 Jul 2007, Daniel Wilhelm wrote:
> I believe that I may have found a bug in R. The top code sample gives
You have 'merely' found a bug in your understanding. What type did you
expect 'a' to be? If you expected a list, that is not what happens in the
first example, and you need
a <- list()
or, better,
a <- vector("list", 2)
> an error as shown. However, by simply switching which field is
> initialized first as in the bottom code sample, it works as expected.
>
>
> This gives an error:
>
>
> a <- NULL
> a[["field1"]] <- 1
Now a is numeric
> a[["field2"]] <- matrix(c(2,1), 1)
>
> Error in a[["field2"]] <- matrix(c(2, 1), 1) :
> more elements supplied than there are to replace
>
>
>
> Yet, this works as expected:
>
> a <- NULL
> a[["field2"]] <- matrix(c(2,1), 1)
Now a is a list
> a[["field1"]] <- 1
>
>
>
> Daniel Wilhelm
>
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>
--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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