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
xyVector object so the x-values used to generate the
y-positions are retained, say for purposes of generating plots.
- a numeric vector
- a numeric vector of the same length as
- An object of class
x a numeric vector y a numeric vector of the same length as
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