R: Perspective plot with colour levels

persp3D {GA} | R Documentation

## Perspective plot with colour levels

### Description

This function draws a perspective plot of a surface with different levels in different colours.

### Usage

    persp3D(x, y, z, theta = 30, phi = 20, d = 5, expand = 2/3,
            xlim = range(x, finite = TRUE), ylim = range(y, finite = TRUE),
            zlim = range(z, finite = TRUE), levels = pretty(zlim, nlevels),
            nlevels = 20, col.palette = jet.colors, border = NA,
            ticktype = "detailed", xlab = NULL, ylab = NULL, zlab = NULL,
            ...)

### Arguments

`x, y` | locations of grid lines at which the values in `z` are measured. These must be in ascending order. By default, equally spaced values from 0 to 1 are used. If `x` is a list, its components `x$x` and `x$y` are used for `x` and `y`, respectively.
`z` | a matrix containing the values to be plotted (NAs are allowed).
`theta, phi` | angles defining the viewing direction. `theta` gives the azimuthal direction and `phi` the colatitude.
`d` | a value which can be used to vary the strength of the perspective transformation.
`expand` | a expansion factor applied to the `z` coordinates.
`xlim, ylim, zlim` | x-, y- and z-limits for the axes.
`levels` | a vector of values specifying the levels to be used for plotting the surface with different colours.
`nlevels` | a value specifying the number of levels to be used for plotting. This value is used if `levels` argument is not specified.
`col.palette` | the colour palette used for plotting.
`border` | the colour of the line drawn around the surface facets. By default is set to `NA` so no borders are drawn.
`ticktype` | a character specifying the type of axes tickmarks. By default `"detailed"` ticks are drawn.
`xlab, ylab, zlab` | character strings specifying the titles for the axes.
`...` | Further arguments passed to the function `persp`.

### Details

This function enhances the default perspective plot for drawing 3-dimensional surfaces.

### Value

Return a list with the following elements:

`persp` | the viewing transformation matrix (see `persp`);
`levels` | a vector of values giving the levels used for plotting the surface;
`colors` | a vector of strings giving the colour used for plotting the surface.

### Author(s)

Luca Scrucca

### See Also

`persp`

### Examples

    y <- x <- seq(-10, 10, length=60)
    f <- function(x,y) { r <- sqrt(x^2+y^2); 10 * sin(r)/r }
    z <- outer(x, y, f)
    persp3D(x, y, z, theta = 30, phi = 30, expand = 0.5)
    persp3D(x, y, z, col.palette = heat.colors, phi = 30, theta = 225,
            box = TRUE, border = NA, shade = .4)
    x1 <- seq(-3,3,length=50)
    x2 <- seq(-3,3,length=50)
    y <- function(x1, x2) sin(x1)+cos(x2)
    persp3D(x1, x2, outer(x1,x2,y), zlab="y", theta = 150, phi = 20, expand = 0.6)

[Package GA version 3.2.1 Index]