On Fri, 21 Aug 1998, Lars Karlsson wrote:
> Is there a way to avoid the loops below?
> vec is a vector of length n. I want to count the number of instances
> where an element and the next j-th element both equals 1.
This is up to scaling the non-centred acf of the vector vec==1. So you
should be able to adapt the output of acf() for your purpose. That uses
Fortran for the loops.
[ completely different solution clipped ]
--
Brian D. Ripley, ripley@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 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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