SDSDOT
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.
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)
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)
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
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