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The BLAS (Basic Linear Algebra Subprograms) are high quality
"building block" routines for performing basic vector and matrix
operations.  Level 1 BLAS do vector-vector operations, Level 2
BLAS do matrix-vector operations, and Level 3 BLAS do
matrix-matrix operations.  Because the BLAS are efficient,
portable, and widely available, they're commonly used in the
development of high quality linear algebra software,
<a href="http://www.netlib.org/linpack/">LINPACK</a> and
<a href="http://www.netlib.org/lap