## Construct an xyVector object

## Usage

    xyVector(x, y)

## Arguments

`x` | a numeric vector
`y` | a numeric vector of the same length as `x`

## Description

Create an object to represent a set of x-y pairs. The resulting object can be treated as a matrix or as a data frame or as a vector. When treated as a vector it reduces to the `y` component only.

The result of functions such as `predict.spline` is returned as an `xyVector` object so the x-values used to generate the y-positions are retained, say for purposes of generating plots.

## Value

An object of class `xyVector` with components

`x` | a numeric vector
`y` | a numeric vector of the same length as `x`

## Author(s)

Douglas Bates and Bill Venables

## Examples

    data( women )
    ispl <- interpSpline( weight ~ height, women )
    weights <- predict( ispl, seq( 55, 75, len = 51 ))
    class( weights )
    plot( weights )
    weights

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