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630 bytes added ,  03:48, 25 June 2014
*sparse matrix tricks
*tricks relying on fortran indexing
 
 
===Changing BLAS===
 
Many Octave functions are wrappers to optimized numerical libraries, notably BLAS and ATLAS. It is possible to achieve impressive performance gain by simply using a library tuned to your platform. One example is using OpenBLAS to replace the default BLAS implementation ([http://www.stat.cmu.edu/~nmv/2013/07/09/for-faster-r-use-openblas-instead-better-than-atlas-trivial-to-switch-to-on-ubuntu/ further details]).
 
On Linux, this just takes a few commands:
 
sudo apt-get install libopenblas-base libatlas3gf-base
 
Then run
 
sudo update-alternatives --config libblas.so.3
 
and select the openblas option.
 
 
====Other references====
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