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

## CDOTU or ZDOTU Function

### Purpose

Returns the complex dot product of two vectors.

### Library

BLAS Library (**libblas.a**)

### FORTRAN Syntax

**COMPLEX FUNCTION CDOTU(***N***, ***X***, ***INCX***, ***Y***, ***INCY***)**
**INTEGER ***INCX***, ***INCY***, ***N*
**COMPLEX ***X***(*), ***Y***(*)**

**DOUBLE COMPLEX FUNCTION ZDOTU(***N***, ***X***, ***INCX***, ***Y***, ***INCY***)**
**INTEGER ***INCX***, ***INCY***, ***N*
**COMPLEX*16 ***X***(*), ***Y***(*)**

### Description

The **CDOTU** or **ZDOTU** function returns the complex dot product of two vectors.

### Parameters

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

### Error Codes

For values of *N* <= 0, a value of 0 is returned.

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