dsdot (3) - Linux Man Pages
DOUBLE PRECISION function dsdot (integerN, real, dimension(*)SX, integerINCX, real, dimension(*)SY, integerINCY)
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.
N is INTEGER number of elements in input vector(s)
SX is REAL array, dimension(N) single precision vector with N elements
INCX is INTEGER storage spacing between elements of SX
SY is REAL array, dimension(N) single precision vector with N elements
INCY is INTEGER storage spacing between elements of SY
DSDOT is DOUBLE PRECISION DSDOT double precision dot product (zero if N.LE.0)
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Univ. of Colorado Denver
- November 2011
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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