C Library Functions - dsdot (3)
NAME
dsdot(3f) - [BLAS:DOUBLE_BLAS_LEVEL1]
CONTENTS
Synopsis
Definition
Options
Return
Authors
Further Details
References
See Also
SYNOPSIS
double precision function dsdot(n,sx,incx,sy,incy)
.. Scalar Arguments .. integer,intent(in) :: incx,incy,n .. .. Array Arguments .. real,intent(in) :: sx(*),sy(*) ..
DEFINITION
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.
OPTIONS
N number of elements in input vector(s) SX array, dimension(N) single precision vector with N elements INCX storage spacing between elements of SX SY array, dimension(N) single precision vector with N elements INCY storage spacing between elements of SY
RETURN
DSDOT dot product (zero if N.LE.0)
AUTHORS
o Univ. of Tennessee o Univ. of California Berkeley o Univ. of Colorado Denver o NAG Ltd. date:December 2016
FURTHER DETAILS
Lawson, C. L., (JPL), Hanson, R. J., (SNLA), Kincaid, D. R., (U. of Texas), Krogh, F. T., (JPL)
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
1979-10-01 DATE WRITTEN 1989-08-31 Modified array declarations. (WRB) 1989-08-31 REVISION DATE from Version 3.2 1989-12-14 Prologue converted to Version 4.0 format. (BAB) 1992-03-10 Corrected definition of LX in DESCRIPTION. (WRB) 1992-05-01 Reformatted the REFERENCES section. (WRB) 1907-01-18 Reformat to LAPACK style (JL)
SEE ALSO
Online html documentation available at http://www.netlib.org/lapack/explore-html/
| Nemo Release 3.1 | dsdot (3) | February 23, 2025 |
