Band Geometry

Create a polygonal band from upper and lower boundaries.

Usage

band(x, y)

Arguments

x

A vector or matrix of x coordinates.

y

A vector or matrix of y coordinates.

If either x or y is supplied as a two-column matrix, the second column is interpreted as the lower boundary and reversed automatically.

Value

An object inheriting from class "bandGeometry".

Details

Typically used to represent confidence or prediction bands.

See also

graphics::polygon

Other geometry.structures: arc(), bezier(), circle(), ellipse(), polygon(), regPolygon(), ring()

Examples

set.seed(18)

x <- rnorm(15)
y <- x + rnorm(15)

new <- seq(-3, 3, 0.5)

pred <- predict(
  lm(y ~ x),
  newdata = data.frame(x = new),
  interval = "confidence"
)

plot(y ~ x)

polygon(
  band(
    x = new,
    y = pred[,2:3]
  ),
  col = addOpacity("grey80", 0.5),
  border = NA
)