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*AIX Version 4.3 Base Operating System and Extensions Technical Reference, Volume 2*

## SDSDOT Function

### Purpose

Returns the dot product of two vectors plus a constant.

### Library

BLAS Library (**libblas.a**)

### FORTRAN Syntax

**REAL FUNCTION SDSDOT(***N***,***B***,***X***,***INCX***,***Y***,***INCY***)**
**INTEGER ***N***,***INCX***,***INCY*
**REAL ***B***,***X***(*),***Y***(*)**

### Purpose

The **SDSDOT** function computes the sum of constant *B* and dot product of vectors *X* and *Y*.

### Parameters

*N* |
On entry, *N* specifies the number of elements in *X* and *Y*; unchanged on exit. |

*B* |
Scalar; unchanged on exit. |

*X* |
Vector of dimension at least (1 + (*N*-1) * abs(*INCX*) ); unchanged on exit. |

*INCX* |
On entry, *INCX* specifies the increment for the elements of *X*; *INCX* must be greater than zero; unchanged on exit. |

*Y* |
Vector of dimension at least (1 + (*N*-1) * abs(*INCY*) ); unchanged on exit. |

*INCY* |
On entry, *INCY* specifies the increment for the elements of *Y*; *INCY* must be greater than 0; unchanged on exit. |

### Error Codes

For values of *N* <= 0, the subroutine returns immediately.

### Implementation Specifics

Computation is performed in double precision.

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