real function sdsdot	(	integer	N,
		real	SB,
		real, dimension(*)	SX,
		integer	INCX,
		real, dimension(*)	SY,
		integer	INCY
	)

SDSDOT

Purpose:

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Date

November 2011

Definition at line 142 of file sdsdot.f.

*
*  -- Reference BLAS level1 routine (version 3.4.0) --
*  -- Reference BLAS is a software package provided by Univ. of Tennessee,    --
*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
*     November 2011
*
*     .. Scalar Arguments ..
      REAL sb
      INTEGER incx,incy,n
*     ..
*     .. Array Arguments ..
      REAL sx(*),sy(*)
*     ..
*
*  PURPOSE
*  =======
*
*  Compute the inner product of two vectors with extended
*  precision accumulation.
*
*  Returns S.P. result with dot product accumulated in D.P.
*  SDSDOT = SB + 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.
*
*  AUTHOR
*  ======
*  Lawson, C. L., (JPL), Hanson, R. J., (SNLA),
*  Kincaid, D. R., (U. of Texas), Krogh, F. T., (JPL)
*
*  ARGUMENTS 
*  =========
*
*  N      (input) INTEGER
*         number of elements in input vector(s)
*
*  SB     (input) REAL
*         single precision scalar to be added to inner product
*
*  SX     (input) REAL array, dimension (N)
*         single precision vector with N elements
*
*  INCX   (input) INTEGER
*         storage spacing between elements of SX
*
*  SY     (input) REAL array, dimension (N)
*         single precision vector with N elements
*
*  INCY   (input) INTEGER
*         storage spacing between elements of SY
*
*  SDSDOT (output) REAL
*         single precision dot product (SB if N .LE. 0)
*
*  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
*  890531  Changed all specific intrinsics to generic.  (WRB)
*  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 coding style
*
*  =====================================================================
*
*     .. Local Scalars ..
      DOUBLE PRECISION dsdot
      INTEGER i,kx,ky,ns
*     ..
*     .. Intrinsic Functions ..
      INTRINSIC dble
*     ..
      dsdot = sb
      IF (n.LE.0) THEN
         sdsdot = dsdot
         RETURN
      END IF   
      IF (incx.EQ.incy .AND. incx.GT.0) THEN
*
*     Code for equal and positive increments.
*
         ns = n*incx
         DO i = 1,ns,incx
            dsdot = dsdot + dble(sx(i))*dble(sy(i))
         END DO
      ELSE
*
*     Code for unequal or nonpositive increments.
*
         kx = 1
         ky = 1
         IF (incx.LT.0) kx = 1 + (1-n)*incx
         IF (incy.LT.0) ky = 1 + (1-n)*incy
         DO i = 1,n
            dsdot = dsdot + dble(sx(kx))*dble(sy(ky))
            kx = kx + incx
            ky = ky + incy
         END DO
      END IF
      sdsdot = dsdot
      RETURN

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