[Rd] "a.matrix[a.char.matrix]<- " crashes R (PR#447)

Peter Dalgaard BSA p.dalgaard@biostat.ku.dk
18 Feb 2000 18:40:30 +0100

Prof Brian Ripley <ripley@stats.ox.ac.uk> writes:

> I think that is the correct behaviour. (What is the expected
> behaviour?  It is what I expected.) A k-index (aka matrix or array
> subset) is supposed to give the indices of the elements to be
> extracted/replaced. I suppose character values could be matched to
> dimnames, but that would be a new idea.  

...but what the user most likely expected!

We might want to *warn*.


> On the other hand, S-PLUS's print routine seems to ignore the added
> elements, and R loses the dim attribute.

As usual when length and dims develops a mismatch... R is saner, I think

> repeated *new *indices.
> The hackery in StringSubscript was copying the wrong string as a name
> for duplicate string indices. Fixed.

So did I but not correctly (had indexnames instead of s). Thanks.

   O__  ---- Peter Dalgaard             Blegdamsvej 3  
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