perspEmpty function

perspEmpty

Creates a persp plot without drawing anything in the interior. Does equivalent of plot( type="n") for persp.

perspEmpty(
  x1,
  x2,
  y,
  x1lab = "x1",
  x2lab = "x2",
  ylab = "y",
  x1lim,
  x2lim,
  ...
)

Arguments

• x1: data for the first horizontal axis, an R vector
• x2: data for the second horizontal axis, an R vector
• y: data for the vertical axis, an R vector
• x1lab: label for the x1 axis, (the one called "xlab" inside persp)
• x2lab: label for the x2 axis, (the one called "ylab" inside persp)
• ylab: label for the y (vertical) axis (the one called "zlab" inside persp)
• x1lim: Optional: limits for x1 axis (should be a vector with 2 elements)
• x2lim: Optional: limits for x2 axis (should be a vector with 2 elements)
• ...: further arguments that are passed to persp. Please note Please remember that y is the vertical axis, but for persp, that is the one I call x2. Thus dot-dot-dot arguments including xlab, ylab, zlab, xlim, ylim, and zlim are going to be ignored.

Returns

The perspective matrix that is returned by persp

Details

Regression demonstrations require a blank slate in which points and planes can be drawn. This function creates that blank persp canvas for those projects. It is not necessary that x1, x2 and y be vectors of the same length, since this function's only purpose is to plot an empty box with ranges determined by the input variables. persp calls the 3 axes x, y, and z, but here they are called x1, x2, and y.

Examples

x1 <- 1:10
x2 <- 41:50
y <-  rnorm(10)
perspEmpty(x1, x2, y)
res <- perspEmpty(x1, x2, y, ticktype="detailed", nticks=10)
mypoints1 <- trans3d ( x1, x2, y, pmat = res )
points( mypoints1, pch = 16, col= "blue")