[R] is.finite() of a list

[ripley@stats.ox.ac.uk]

On Sun, 9 Feb 2003, stephen wisdom wrote:

> 
> > ?is.finite
> 
>      `is.finite' and `is.infinite' return a vector of the same length
>      as `x', indicating which elements are finite or not.
> 
> is.finite() of a list seems to return a vector of the length of the list, 
but with value FALSE if any list element isn't finite.  Is this intended?

That is not the pattern, and the real pattern *is* intentional.  All
non-numeric vectors are not finite:

> is.finite(list(1,2,3))
[1] FALSE FALSE FALSE

Although a list is a generic vector, it is not a numeric vector.

I'll add that comment to the help page.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
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