# 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

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