DSDOT(1)

NAME
LAPACK-3 - accumulation and result

SYNOPSIS

DOUBLE PRECISION
    FUNCTION DSDOT(N,SX,INCX,SY,INCY)

INTEGER
    INCX,INCY,N

REAL
    SX(*),SY(*)

PURPOSE
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.

ARGUMENTS

N      (input) INTEGER
     number of elements in input vector(s)

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

DSDOT  (output) DOUBLE PRECISION
     DSDOT double precision dot product (zero 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
 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)