dsdot.f(3) LAPACK dsdot.f(3)
NAME
dsdot.f -
SYNOPSIS
**Functions/Subroutines**
DOUBLE PRECISION function **dsdot **(N, SX, INCX, SY, INCY)
**DSDOT**
Function/Subroutine Documentation
**DOUBLE PRECISION function dsdot (integerN, real, dimension(*)SX,**
**integerINCX, real, dimension(*)SY, integerINCY)**
**DSDOT Purpose:**
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.
**Parameters:**
*N*
N is INTEGER
number of elements in input vector(s)
*SX*
SX is REAL array, dimension(N)
single precision vector with N elements
*INCX*
INCX is INTEGER
storage spacing between elements of SX
*SY*
SY is REAL array, dimension(N)
single precision vector with N elements
*INCY*
INCY is INTEGER
storage spacing between elements of SY
**Returns:**
DSDOT
DSDOT is DOUBLE PRECISION
DSDOT double precision dot product (zero if N.LE.0)
**Author:**
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
**Date:**
November 2011
**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)
Definition at line 120 of file dsdot.f.
Author
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Version 3.4.2 Tue Sep 25 2012 dsdot.f(3)