BLAS/SRC/dsdot.f(3)        Library Functions Manual        BLAS/SRC/dsdot.f(3)

NAME
       BLAS/SRC/dsdot.f

SYNOPSIS
   Functions/Subroutines
       double precision function dsdot (n, sx, incx, sy, incy)
           DSDOT

Function/Subroutine Documentation
   double precision function dsdot (integer n, real, dimension(*) sx, integer
       incx, real, dimension(*) sy, integer incy)
       DSDOT

       Purpose:


           !>
           !> Compute the inner product of two vectors with extended
           !> precision accumulation and result.
           !>
           !> Returns D.P. dot product accumulated in D.P., for S.P. SX and SY
           !> DSDOT = sum for I = 0 to N-1 of  SX(LX+I*INCX) * SY(LY+I*INCY),
           !> where LX = 1 if INCX .GE. 0, else LX = 1+(1-N)*INCX, and LY is
           !> defined in a similar way using INCY.
           !>

       Parameters
           N

           !>          N is INTEGER
           !>         number of elements in input vector(s)
           !>

           SX

           !>          SX is REAL array, dimension(N)
           !>         single precision vector with N elements
           !>

           INCX

           !>          INCX is INTEGER
           !>          storage spacing between elements of SX
           !>

           SY

           !>          SY is REAL array, dimension(N)
           !>         single precision vector with N elements
           !>

           INCY

           !>          INCY is INTEGER
           !>         storage spacing between elements of SY
           !>

       Returns
           DSDOT

           !>          DSDOT is DOUBLE PRECISION
           !>         DSDOT  double precision dot product (zero if N.LE.0)
           !>

       Author
           Univ. of Tennessee


           Univ. of California Berkeley


           Univ. of Colorado Denver


           NAG Ltd.

       Further Details:


           !>

       References:


           !>
           !>
           !>  C. L. Lawson, R. J. Hanson, D. R. Kincaid and F. T.
           !>  Krogh, Basic linear algebra subprograms for Fortran
           !>  usage, Algorithm No. 539, Transactions on Mathematical
           !>  Software 5, 3 (September 1979), pp. 308-323.
           !>
           !>  REVISION HISTORY  (YYMMDD)
           !>
           !>  791001  DATE WRITTEN
           !>  890831  Modified array declarations.  (WRB)
           !>  890831  REVISION DATE from Version 3.2
           !>  891214  Prologue converted to Version 4.0 format.  (BAB)
           !>  920310  Corrected definition of LX in DESCRIPTION.  (WRB)
           !>  920501  Reformatted the REFERENCES section.  (WRB)
           !>  070118  Reformat to LAPACK style (JL)
           !>

       Definition at line 118 of file dsdot.f.

Author
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LAPACK                          Version 3.12.0             BLAS/SRC/dsdot.f(3)