| % File src/library/splines/man/xyVector.Rd |
| % Part of the R package, https://www.R-project.org |
| % Copyright 1995-2007 R Core Team |
| % Distributed under GPL 2 or later |
| |
| \name{xyVector} |
| \alias{xyVector} |
| \title{Construct an \code{xyVector} Object} |
| \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 \code{y} component only. |
| |
| The result of functions such as \code{predict.spline} is returned as |
| an \code{xyVector} object so the x-values used to generate the |
| y-positions are retained, say for purposes of generating plots. |
| } |
| \usage{ |
| xyVector(x, y) |
| } |
| \arguments{ |
| \item{x}{a numeric vector} |
| \item{y}{a numeric vector of the same length as \code{x}} |
| } |
| \value{ |
| An object of class \code{xyVector} with components |
| \item{x}{a numeric vector} |
| \item{y}{a numeric vector of the same length as \code{x}} |
| } |
| \author{Douglas Bates and Bill Venables} |
| \examples{ |
| require(stats); require(graphics) |
| ispl <- interpSpline( weight ~ height, women ) |
| weights <- predict( ispl, seq( 55, 75, length.out = 51 )) |
| class( weights ) |
| plot( weights, type = "l", xlab = "height", ylab = "weight" ) |
| points( women$height, women$weight ) |
| weights |
| } |
| \keyword{ models } |