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Hi - yes, we would ideally like to switch to more optimised linear algebra routines such as those that you mention. However, we would need a C++ wrapper to these that looked identical to our current calls to newmat - otherwise we would need a lot of programming manpower to convert all our code. So - it's on our todo list.... Cheers. On 17 Apr 2008, at 16:04, Blaise Frederick wrote: > Cool - I had just made the same change and was testing it - glad to > see that's it! > > As an aside, in general profiling, it seems that pretty much all of > the programs that take a lot more > time than I'd like (film_gls - I'm looking at you!) seem to spend a > huge amount of time (over 85%) in > NEWMAT, especially in the matrix multiplication routine. This isn't > surprising, given that fMRI > processing is basically just a lot of linear algebra. Have you > given any thought to recoding some of > the routines in NEWMAT (especially matrix multiplication and SVD) to > use LAPACK and BLAS? That > would get you vector performance for free, since pretty much every > OS has hand-optimized versions > of these libraries available. > > Blaise > --------------------------------------------------------------------------- Stephen M. Smith, Professor of Biomedical Engineering Associate Director, Oxford University FMRIB Centre FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK +44 (0) 1865 222726 (fax 222717) [log in to unmask] http://www.fmrib.ox.ac.uk/~steve ---------------------------------------------------------------------------