2 messages · ronggui, Brian Ripley
the help page says:
'is.list' returns 'TRUE' iff its argument is a 'list' _or_ a
'pairlist' of 'length' > 0, whereas 'is.pairlist' only returns
'TRUE' in the latter case.
does the "latter case" mean a 'pairlist' of 'length' > 0?
but
is.pairlist(pairlist())
[1] TRUE
length(pairlist())
[1] 0 what the help page exactly means? 2005-10-14 ------ Deparment of Sociology Fudan University My new mail addres is ronggui.huang at gmail.com Blog:http://sociology.yculblog.com
The help page means exactly what it says, but the English is too subtle and I have reworded it. I have no idea why you are interested in pairlists (they are hardly used at user-visible level these days). The point is that pairlist() is NULL and so strictly not a pairlist at all (try typeof() on it). However, is.pairlist(NULL) is true for historical reasons.
the help page says:
'is.list' returns 'TRUE' iff its argument is a 'list' _or_ a
'pairlist' of 'length' > 0, whereas 'is.pairlist' only returns
'TRUE' in the latter case.
does the "latter case" mean a 'pairlist' of 'length' > 0?
but
is.pairlist(pairlist())
[1] TRUE
length(pairlist())
[1] 0 what the help page exactly means? 2005-10-14 ------ Deparment of Sociology Fudan University
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