p?dotu

Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

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ID 766686

Date 4/28/2026

Version

Public

p?dotu

Computes the dot product of two distributed complex vectors.

Syntax

call pcdotu ( n , dotu , x , ix , jx , descx , incx , y , iy , jy , descy , incy )

call pzdotu ( n , dotu , x , ix , jx , descx , incx , y , iy , jy , descy , incy )

Include Files

mkl_pblas.h

Description

The p?dotu functions compute the dot product dotu of two distributed vectors defined as

dotu = sub( x )’*sub( y )

where sub(x) and sub(y) are n -element distributed vectors.

sub(x) denotes X(ix, jx:jx+n-1) if incx=m_x , and X(ix: ix+n-1, jx) if incx= 1 ;

sub(y) denotes Y(iy, jy:jy+n-1) if incy=m_y , and Y(iy: iy+n-1, jy) if incy= 1 .

Input Parameters

n

(global) INTEGER . The length of distributed vectors, n ≥ 0.

x

(local) COMPLEX for pcdotu

DOUBLE COMPLEX for pzdotu Array, size (jx-1)*m_x + ix+(n-1)*abs(incx)) . This array contains the entries of the distributed vector sub(x) .

ix , jx

(global) INTEGER . The row and column indices in the distributed matrix X indicating the first row and the first column of the submatrix sub(X) , respectively.

descx

(global and local) INTEGER array of dimension 9. The array descriptor of the distributed matrix X .

incx

(global) INTEGER . Specifies the increment for the elements of sub(x) . Only two values are supported, namely 1 and m_x . incx must not be zero.

y

(local) COMPLEX for pcdotu

DOUBLE COMPLEX for pzdotu Array, size (jy-1)*m_y + iy+(n-1)*abs(incy)) . This array contains the entries of the distributed vector sub(y) .

iy , jy

(global) INTEGER . The row and column indices in the distributed matrix Y indicating the first row and the first column of the submatrix sub(Y) , respectively.

descy

(global and local) INTEGER array of dimension 9. The array descriptor of the distributed matrix Y .

incy

(global) INTEGER . Specifies the increment for the elements of sub(y) . Only two values are supported, namely 1 and m_y . incy must not be zero.

Output Parameters

dotu

(local) COMPLEX for pcdotu

DOUBLE COMPLEX for pzdotu Dot product of sub(x) and sub(y) only in their scope.

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Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

p?dotu

Syntax

Include Files

Description

Input Parameters

Output Parameters