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# cdotu.f

Section: LAPACK (3)
Updated: Thu Jun 23 2016
Index

cdotu.f -

## SYNOPSIS

### Functions/Subroutines

complex function CDOTU (N, CX, INCX, CY, INCY)
CDOTU

## Function/Subroutine Documentation

### complex function CDOTU (integer N, complex, dimension(*) CX, integer INCX, complex, dimension(*) CY, integer INCY)

CDOTU

Purpose:

`    CDOTU forms the dot product of two vectors.`

Author:

Univ. of Tennessee

Univ. of California Berkeley

NAG Ltd.

Date:

November 2011

Further Details:

`     jack dongarra, linpack, 3/11/78.     modified 12/3/93, array(1) declarations changed to array(*)`

Definition at line 52 of file cdotu.f.

`52 *53 *  -- Reference BLAS level1 routine (version 3.4.0) --54 *  -- Reference BLAS is a software package provided by Univ. of Tennessee,    --55 *  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--56 *     November 201157 *58 *     .. Scalar Arguments ..59       INTEGER incx,incy,n60 *     ..61 *     .. Array Arguments ..62       COMPLEX cx(*),cy(*)63 *     ..64 *65 *  =====================================================================66 *67 *     .. Local Scalars ..68       COMPLEX ctemp69       INTEGER i,ix,iy70 *     ..71       ctemp = (0.0,0.0)72       cdotu = (0.0,0.0)73       IF (n.LE.0) RETURN74       IF (incx.EQ.1 .AND. incy.EQ.1) THEN75 *76 *        code for both increments equal to 177 *78          DO i = 1,n79             ctemp = ctemp + cx(i)*cy(i)80          END DO81       ELSE82 *83 *        code for unequal increments or equal increments84 *          not equal to 185 *86          ix = 187          iy = 188          IF (incx.LT.0) ix = (-n+1)*incx + 189          IF (incy.LT.0) iy = (-n+1)*incy + 190          DO i = 1,n91             ctemp = ctemp + cx(ix)*cy(iy)92             ix = ix + incx93             iy = iy + incy94          END DO95       END IF96       cdotu = ctemp97       RETURN`

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Index

NAME
SYNOPSIS
Functions/Subroutines
Function/Subroutine Documentation
complex function CDOTU (integer N, complex, dimension(*) CX, integer INCX, complex, dimension(*) CY, integer INCY)
Author

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