[R] functions for high dimensional integral
Prof Brian Ripley
ripley at stats.ox.ac.uk
Sat Jun 7 11:56:13 CEST 2008
On Fri, 6 Jun 2008, ZT2008 wrote:
> I need to compute a high dimensional integral. Currently I'm using the
> function adapt in R package adapt. But this method is kind of slow to me.
> I'm wondering if there are other solutions. Thanks.
What does 'high' mean? Numerical quadrature will be slow in more than a
handful of dimensions.
What to recommend depends on what you know about the function -- Evans &
Swartz (2000) 'Approximating Integrals via Monte Carlo and Deterministic
Methods' is a good reference on integration for statisticians.
But accurate evaluation of an integral in more than 2 or 3 dimensions is
potentially a very computer-intensive task -- people spend days of CPU
time using e.g. MCMC to do just that.
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
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