BLAS1_S
Basic Linear Algebra Subprograms
Level 1
Single Precision Real Arithmetic

BLAS1_S is a library of FORTRAN77 routines, using single 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 the single precision complex arithmetic version of BLAS1.

BLAS1_D is the double precision real arithmetic version of BLAS1.

BLAS1_S is also available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version.

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

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

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

GSL is the Gnu Scientific Library, 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 C library which includes some of the BLAS1 routines.

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, 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, 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_s.f, the source code;
• blas1_s.csh, commands to compile the source code;

Examples and Tests:

• blas1_s_prb.f, a calling program;
• blas1_s_prb.csh, commands to compile, link, load and run the calling program;
• blas1_s_prb_output.txt, the output file.

List of Routines:

• ISAMAX finds the index of the real vector element of maximum absolute value.
• LSAME returns TRUE if CA is the same letter as CB regardless of case.
• SASUM sums the absolute values of the entries of a real vector.
• SAXPY adds a constant times one real vector to another.
• SCASUM sums the absolute values of the entries of a complex vector.
• SCNRM2 computes the Euclidean norm of a complex vector.
• SCOPY copies one real vector into another.
• SDOT forms the dot product of two real vectors.
• SNRM2 computes the Euclidean norm of a real vector.
• SROT applies a real plane rotation.
• SROTG constructs a real Givens plane rotation.
• SSCAL scales a real vector by a constant.
• SSWAP interchanges two real vectors.
• XERBLA is an error handler for the LAPACK routines.

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