# sdsdot.f - Man Page

BLAS/SRC/sdsdot.f

## Synopsis

### Functions/Subroutines

real function **sdsdot** (n, sb, sx, incx, sy, incy)**SDSDOT**

## Function/Subroutine Documentation

### real function sdsdot (integer n, real sb, real, dimension(*) sx, integer incx, real, dimension(*) sy, integer incy)

**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.

**Parameters***N*N is INTEGER number of elements in input vector(s)

*SB*SB is REAL single precision scalar to be added to inner product

*SX*SX is REAL array, dimension ( 1 + ( N - 1 )*abs( INCX ) ) single precision vector with N elements

*INCX*INCX is INTEGER storage spacing between elements of SX

*SY*SY is REAL array, dimension ( 1 + ( N - 1 )*abs( INCX ) ) single precision vector with N elements

*INCY*INCY is INTEGER storage spacing between elements of SY

**Author**Lawson, C. L., (JPL), Hanson, R. J., (SNLA),

Kincaid, D. R., (U. of Texas), Krogh, F. T., (JPL)

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

**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

Definition at line **112** of file **sdsdot.f**.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

The man page sdsdot(3) is an alias of sdsdot.f(3).

Tue Nov 28 2023 12:08:41 Version 3.12.0 LAPACK