DSDOT - Online Linux Manual PageSection : 1
Updated : November 2008
Source : BLAS routine
Note : BLAS routine
NAMEDSDOT - accumulation and result

SYNOPSISDOUBLE PRECISION  FUNCTION DSDOT(N,SX,INCX,SY,INCY)  INTEGER INCX,INCY,N  REAL SX(*),SY(*)

PURPOSEprecision 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.

ARGUMENTSN (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 DETAILSREFERENCES 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)

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