James R. Phillips
Wed Aug 3 12:51:00 GMT 2005
A coding error has been found and fixed in the netlib reference cblas routines,
requiring the Cygwin Lapack 3.0 package to be updated to release 3.
+ fixed cblas_sdsdot routine in reference cblas
More information in the lapack-3.0.README file.
Lapack 3.0 is a comprehensive FORTRAN library for linear algebra operations. It
includes matrix inversions, least squared solutions to sets of equations,
eigenvector analysis, singular value decomposition, etc. It is a very
comprehensive and reputable package that has found extensive use in the
scientific community. Lapack requires a blas (basic linear algebra system)
implementation; the Cygwin binary distribution includes a non-optimized
reference blas library. The Cygwin source distribution includes Atlas,
allowing a locally optimized blas library to be compiled and installed from
source. This greatly improves the computational speed of the Lapack library.
See README.optimize in the CYGWIN-PATCHES subdirectory of the source
distribution for further information on optimized lapack libraries.
Lapack Home Page: http://www.netlib.org/lapack/
Atlas Home Page: http://math-atlas.sourceforge.net/
To update your installation, click on the "Install Cygwin now" link on the
http://cygwin.com/ web page. This downloads setup.exe to your system. Save it
and run setup, answer the questions and pick up 'lapack' from the 'Math'
category. Then click on the 'skip' field next to 'lapack' until '3.0-3' is
Note that downloads from sources.redhat.com (aka cygwin.com) aren't allowed due
to bandwidth limitations. This means that you will need to find a mirror which
has this update, please choose the one nearest to you:
If you want to make a point or ask a question the Cygwin mailing list is the
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James R. Phillips
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