dzsum1(3S)

NAME
     DZSUM1 - take the sum of the absolute values of a complex vector and
     returns a double precision result

SYNOPSIS
     DOUBLE PRECISION FUNCTION DZSUM1( N, CX, INCX )

         INTEGER      INCX, N

         COMPLEX*16   CX( * )

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.

PURPOSE
     DZSUM1 takes the sum of the absolute values of a complex vector and
     returns a double precision result. Based on DZASUM from the Level 1 BLAS.
     The change is to use the 'genuine' absolute value.

     Contributed by Nick Higham for use with ZLACON.


ARGUMENTS
     N       (input) INTEGER
             The number of elements in the vector CX.

     CX      (input) COMPLEX*16 array, dimension (N)
             The vector whose elements will be summed.

     INCX    (input) INTEGER
             The spacing between successive values of CX.  INCX > 0.

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

     This man page is available only online.