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

Example

• Blas Level 1
• Blas Level 2
• Blas Level 3