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SSUM(3S)							      SSUM(3S)

NAME
     SSUM, DSUM, CSUM, ZSUM - Sums the elements of a real or complex vector

SYNOPSIS
     Single precision

	  Fortran:
	       real SSUM
	       real sum
	       sum = SSUM (n, x, incx)

	  C/C++:
	       #include <scsl_blas.h>
	       float ssum (int n, float *x, int incx);

     Double precision
	  Fortran:
	       double precision IDSUM
	       double precision sum
	       sum = DSUM (n, x, incx)

	  CC++:
	       #include <scsl_blas.h>
	       double dsum (int n, double *x, int incx);

     Single precision complex
	  Fortran:
	       complex CSUM
	       complex sum
	       sum = CSUM (n, x, incx)

	  C/C++:
	       #include <scsl_blas.h>
	       scsl_complex csum (int n, scsl_complex *x, int incx);

	  C++ STL:
	       #include <complex.h>
	       #include <scsl_blas.h>
	       complex<float> csum (int n, complex<float> *x, int incx);

     Double precision complex

	  Fortran:
	       double complex ZSUM
	       double complex sum
	       sum = ZSUM (n, x, incx)

	  C/C++:
	       #include <scsl_blas.h>
	       scsl_zomplex zsum (int n, scsl_zomplex *x, int incx);

									Page 1

SSUM(3S)							      SSUM(3S)

	  C++ STL:
	       #include <complex.h>
	       #include <scsl_blas.h>
	       complex<double> zsum (int n, complex<double> *x, int incx);

IMPLEMENTATION
     These routines are part of the SCSL Scientific Library and can be loaded
     using either the -lscs or the -lscs_mp option.  The -lscs_mp option
     directs the linker to use the multi-processor version of the library.

     When linking to SCSL with -lscs or -lscs_mp, the default integer size is
     4 bytes (32 bits). Another version of SCSL is available in which integers
     are 8 bytes (64 bits).  This version allows the user access to larger
     memory sizes and helps when porting legacy Cray codes.  It can be loaded
     by using the -lscs_i8 option or the -lscs_i8_mp option. A program may use
     only one of the two versions; 4-byte integer and 8-byte integer library
     calls cannot be mixed.

     The C and C++ prototypes shown above are appropriate for the 4-byte
     integer version of SCSL. When using the 8-byte integer version, the
     variables of type int become long long and the <scsl_blas.h> header file
     should be included.

DESCRIPTION
     SSUM/DSUM sums the elements of a real vector.

     CSUM/ZSUM sums the elements of a complex vector.

     These routines perform the following vector operation:

		  n
	  sum <- Sum  x
		 i=1   i

     These routines have the following arguments:

     sum       Sum of the elements of the vector x.  If n <= 0, sum is set to
	       0. (input)
	       SSUM: Single precision sum.
	       DSUM: Double precision sum.
	       CSUM: Single precision complex sum.
	       ZSUM: Double precision complex sum.

     n	       Integer.	 (input)
	       Number of vector elements to be summed.

     x	       Array of dimension (n-1) * |incx| + 1.  (input)
	       SSUM: Single precision array.
	       DSUM: Double precision array.
	       CSUM: Single precision complex array.
	       ZSUM: Double precision complex array.

									Page 2

SSUM(3S)							      SSUM(3S)

	       Vector that contains elements to be summed.

     incx      Integer.	 (input)
	       Increment between elements of x.	 If incx = 0, the results will
	       be unpredictable.

NOTES
     These routines are extensions to the standard Level 1 Basic Linear
     Algebra Subprograms (Level 1 BLAS).

     When working backward (incx < 0), each routine starts at the end of the
     vector and moves backward, as follows:

     Fortran:

	  x(1 - incx * (n-1)), x(1 - incx * (n-2)), ..., x(1)

     C/C++:

	  x[-incx * (n-1)], x[-incx * (n-2)], ..., x[0]

   Data Types
     The following data types are described in this documentation:

	  Term Used			Data type

     Fortran:

	  Array dimensioned n		x(n)

	  Integer			INTEGER (INTEGER*8 for -lscs_i8[_mp])

	  Single precision		REAL

	  Double precision		DOUBLE PRECISION

	  Single precision complex	COMPLEX

	  Double precision complex	DOUBLE COMPLEX

     C/C++:

	  Array dimensioned n		x[n]

	  Integer			int (long long for -lscs_i8[_mp])

	  Single precision		float

									Page 3

SSUM(3S)							      SSUM(3S)

	  Double precision		double

	  Single precision complex	scsl_complex

	  Double precision complex	scsl_zomplex

     C++ STL:

	  Array dimensioned n		x[n]

	  Integer			int (long long for -lscs_i8[_mp])

	  Single precision		float

	  Double precision		double

	  Single precision complex	complex<float>

	  Double precision complex	complex<double>

SEE ALSO
     INTRO_SCSL(3S), INTRO_BLAS1(3S)

     INTRO_CBLAS(3S) for information about using the C interface to Fortran 77
     Basic Linear Algebra Subprograms (legacy BLAS) set forth by the Basic
     Linear Algebra Subprograms Technical Forum.

									Page 4

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