emdbook (version 1.3.2.1)

curve3d: Plot a 3D surface representing a 2D curve

Description

Two-dimensional analogue of curve: generates a surface and plots it

Usage

curve3d(expr, from = c(0, 0), to = c(1, 1), n = c(41, 41),
xlim, ylim, add = FALSE,
xlab=varnames[1],
ylab=varnames[2],
zlab = NULL, log = NULL, sys3d = c("persp", "wireframe", "rgl",
"contour", "image", "none"),
varnames=c("x","y"),...)

Arguments

expr

a mathematical expression using x and y as the independent variables

from

minimum values for x and y

to

maximum values for x and y

xlim

range of values for x

ylim

range of values for y

n

number of grid points in each direction

add

(logical) add to an existing plot? (only possible for contour plots or rgl)

xlab

x label

ylab

y label

zlab

z label

log

(character): "x", "y", or "xy" for logarithmic axes

sys3d

3D plotting system to use: one of "persp", "wireframe", "rgl", "contour", "image", or "none"

varnames

names of variables to substitute

...

additional arguments to the plotting functions

Value

• invisibly, a list of
• x
  x values
• y
  y values
• z
  z matrix

See Also

outer, curve

Examples

curve3d(cos(2*pi*x)+sin(2*pi*y/3),
 from=c(0,0),to=c(1,1))
x <- 1
y <- 3
curve3d(cos(2*pi*x)+sin(2*pi*y/3),
 from=c(0,0),to=c(1,1),sys3d="wireframe")
curve3d(x*cos(2*pi*a/x)+sin(2*pi*b/y),
 from=c(0,0),to=c(1,1),sys3d="wireframe",
varnames=c("a","b"))  ## identical
par(mfrow=c(2,2))
curve3d(cos(2*pi*x)+sin(2*pi*y/3),
 from=c(0,0),to=c(1,1),sys3d="image")
curve3d(x*cos(2*pi*a/x)+sin(2*pi*b/y),
 from=c(0,0),to=c(1,1),sys3d="image",
varnames=c("a","b"))  ## identical
x <- 4
curve3d(cos(2*pi*a/x)+y*sin(2*pi*b/y),
 from=c(0,0),to=c(1,1),sys3d="image",
varnames=c("a","b"))
curve3d(cos(2*pi*x)+sin(2*pi*y/3),
 from=c(0,0),to=c(1,1),sys3d="image")
curve3d(cos(2*pi*x)+sin(2*pi*y/3),
 sys3d="contour",add=TRUE)