SDOT/DDOT/CDOTC/CDOTU/ZDOTC/ZDOTU

Dot product

Name SDOT/DDOT/CDOTC/CDOTU/ZDOTC/ZDOTU

Dot product

Purpose Given real or complex data vectors x and y of length n, these subprograms compute the dot products

n

 

n

s = ∑ xi yi

and

s = ∑

x

i yi

i = 1

 

i = 1

where x is the complex conjugate of x. The vectors can be stored in one-dimensional arrays or in either rows or columns of two-dimensional arrays. Indexing through the arrays can be either forward or backward.

Usage

VECLIB:

 

 

INTEGER*4

n, incx, incy

 

REAL*4

s, SDOT, x(lenx), y(leny)

 

s = SDOT(n, x, incx, y, incy)

 

INTEGER*4

n, incx, incy

 

REAL*8

s, DDOT, x(lenx), y(leny)

 

s = DDOT(n, x, incx, y, incy)

 

INTEGER*4

n, incx, incy

 

COMPLEX*8

s, CDOTC, x(lenx), y(leny)

 

s = CDOTC(n, x, incx, y, incy)

 

INTEGER*4

n, incx, incy

 

COMPLEX*8

s, CDOTU, x(lenx), y(leny)

 

s = CDOTU(n, x, incx, y, incy)

 

INTEGER*4

n, incx, incy

 

COMPLEX*16

s, ZDOTC, x(lenx), y(leny)

 

s = ZDOTC(n, x, incx, y, incy)

 

INTEGER*4

n, incx, incy

 

COMPLEX*16

s, ZDOTU, x(lenx), y(leny)

s = ZDOTU(n, x, incx, y, incy)

VECLIB8:

INTEGER*8

n, incx, incy

REAL*4

s, SDOT, x(lenx), y(leny)

s = SDOT(n, x, incx, y, incy)

84HP MLIB User’s Guide