DSDOT (3) Linux Manual Page

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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