f06ea computes the scalar product of two real vectors.

Syntax

C#
public static double f06ea( int n, double[] x, int incx, double[] y, int incy, out int ifail )

Visual Basic
Public Shared Function f06ea ( _ n As Integer, _ x As Double(), _ incx As Integer, _ y As Double(), _ incy As Integer, _ <OutAttribute> ByRef ifail As Integer _ ) As Double

Visual C++
public: static double f06ea( int n, array<double>^ x, int incx, array<double>^ y, int incy, [OutAttribute] int% ifail )

F#
static member f06ea : n : int * x : float[] * incx : int * y : float[] * incy : int * ifail : int byref -> float

n: Type: System..::..Int32
On entry: $n$ , the number of elements in $x$ and $y$ .

x: Type: array<System..::..Double>[]()[][]
An array of size [dim1]
Note: the dimension of the array x must be at least $\max (1, 1 + (n - 1) \times |incx|)$ .
On entry: the $n$ -element vector $x$ .
If $incx > 0$ , $x_{i}$ must be stored in $x [1 + (i - 1) \times incx]$ , for $i = 1, 2, \dots, n$ .

If $incx < 0$ , $x_{i}$ must be stored in $x [1 - (n - i) \times incx]$ , for $i = 1, 2, \dots, n$ .

Intermediate elements of x are not referenced.

incx: Type: System..::..Int32
On entry: the increment in the subscripts of x between successive elements of $x$ .

y: Type: array<System..::..Double>[]()[][]
An array of size [dim1]
Note: the dimension of the array y must be at least $\max (1, 1 + (n - 1) \times |incy|)$ .
On entry: the $n$ -element vector $y$ .
If $incy > 0$ , $y_{i}$ must be stored in $y [1 + (i - 1) \times incy]$ , for $i = 1, 2, \dots, n$ .

If $incy < 0$ , $y_{i}$ must be stored in $y [1 - (n - i) \times incy]$ , for $i = 1, 2, \dots, n$ .

Intermediate elements of y are not referenced.

incy: Type: System..::..Int32
On entry: the increment in the subscripts of y between successive elements of $y$ .

ifail: Type: System..::..Int32%
On exit: $ifail = 0$ unless the method detects an error (see [Error Indicators and Warnings]).

f06ea computes the scalar product of two real vectors.

Description

f06ea returns the value of the scalar product

x^{T} y

where

x

and

y

are

n

-element real vectors scattered with stride incx and incy respectively.

Lawson C L, Hanson R J, Kincaid D R and Krogh F T (1979) Basic linear algebra supbrograms for Fortran usage ACM Trans. Math. Software 5 308–325

Not applicable.

None.

None.