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= Basic Linear Algebra Subroutines (BLAS) =
[http://www.netlib.org/blas/faq.html] 

Core routines used by LAPACK (Linear Algebra Package) and elsewhere. 
Generally optimized for particular machine architectures, cache hierarchy.

The subroutines are categorized to three levels.
* Level 1: Scalar and vector operations 
* Level 2: Matrix-vector operations 
* Level 3: Matrix-matrix operations

Subroutine names start with: 
* S: single precision 
* D: double precision 
* C: single precision complex 
* Z: double precision complex 

Examples:
* DDOT: dot product of two vectors 
* DGEMV: matrix-vector multiply, general matrices 
* DGEMM: matrix-matrix multiply, general matrices 
* DSYMM: matrix-matrix multiply, symmetric matrices

List of Subroutine : [http://www.netlib.org/blas/blasqr.pdf]