BLAS1_D
Basic Linear Algebra Subprograms
Level 1
Double Precision Real Arithmetic

BLAS1_D is a library of FORTRAN77 routines, using double precision real arithmetic, which implement the Level 1 BLAS, or Basic Linear Algebra Subprograms.

The BLAS are a small core library of linear algebra utilities, which can be highly optimized for various architectures. Software that relies on the BLAS is thus highly portable, and will typically run very efficiently.

The Level 1 BLAS are primarily for use in vector operations. In certain cases, they may also be used to operate on the rows or columns of a two-dimensional array.

Related Data and Programs:

BLAS1_C is a FORTRAN77 library which is a version of BLAS1 for single precision complex arithmetic.

BLAS1_D is also available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version.

BLAS1_S is a FORTRAN77 library which is a version of BLAS1 for single precision real arithmetic.

BLAS1_Z is a FORTRAN77 library which is a version of BLAS1 for double precision complex arithmetic.

BLAS2 is a FORTRAN77 library which handles matrix-vector operations.

BLAS3 is a FORTRAN77 library which handles matrix-matrix operations.

GSL is a FORTRAN77 library which is the Gnu Scientific Library which includes an implementation of the BLAS1 routines.

LAPACK is a FORTRAN77 library which is a linear algebra package which uses the BLAS1 routines.

LINPACK is a FORTRAN77 library which is a linear algebra package which uses the BLAS1 routines.

SUPER_BLAS is a FORTRAN77 library which is a version of some of the BLAS1 routines written in C.

Reference:

1. Jack Dongarra, Jim Bunch, Cleve Moler, Pete Stewart,
   LINPACK User's Guide,
   SIAM, 1979,
   ISBN13: 978-0-898711-72-1,
   LC: QA214.L56.
2. Charles Lawson, Richard Hanson, David Kincaid and Fred Krogh,
   Algorithm 539, Basic Linear Algebra Subprograms for Fortran Usage,
   ACM Transactions on Mathematical Software,
   Volume 5, Number 3, September 1979, pages 308-323.
3. Thomas Coleman and Charles Van Loan,
   Handbook for Matrix Computations,
   Society for Industrial and Applied Mathematics,
   3600 University City Science Center,
   Philadelphia, PA 19104-2688.

Source Code:

• blas1_d.f, the source code;
• blas1_d.csh, commands to compile the source code;

Examples and Tests:

• blas1_d_prb.f, a calling program;
• blas1_d_prb.csh, commands to compile, link, load and run the calling program;
• blas1_d_prb_output.txt, the output file.

List of Routines:

• DASUM takes the sum of the absolute values.
• DAXPY computes constant times a vector plus a vector.
• DCOPY copies a vector, x, to a vector, y.
• DDOT forms the dot product of two vectors.
• DNRM2 returns the euclidean norm of a vector.
• DROT applies a plane rotation.
• DROTG constructs a Givens plane rotation.
• DSCAL scales a vector by a constant.
• DSWAP interchanges two vectors.
• IDAMAX finds the index of element having maximum absolute value.
• LSAME returns TRUE if CA is the same letter as CB regardless of case.
• XERBLA is an error handler.

You can go up one level to the FORTRAN77 source codes.