| xyz.coords {grDevices} | R Documentation |
Utility for obtaining consistent x, y and z coordinates and labels for three dimensional (3D) plots.
xyz.coords(x, y = NULL, z = NULL, xlab = NULL, ylab = NULL, zlab = NULL,
log = NULL, recycle = FALSE)
x, y, z |
the x, y and z coordinates of a set of points.
Both y and z can be left at NULL. In this
case, an attempt is made to interpret x in a way suitable for
plotting.
If the argument is a formula zvar ~ xvar + yvar,
xvar, yvar and zvar are used as x, y and z
variables;
if the argument is a list containing components x,
y and z, these are assumed to define plotting coordinates;
if the argument is a matrix or data.frame with three
or more columns, the first is
assumed to contain the x values, the 2nd the y ones, and the 3rd the
z ones – independently of any column names that x may have.
Alternatively two arguments x and y can be provided
(leaving z = NULL). One may be real, the other complex;
in any other case, the arguments are coerced to vectors
and the values plotted against their indices.
|
xlab, ylab, zlab |
names for the x, y and z variables to be extracted. |
log |
character, "x", "y", "z" or combinations.
Sets negative values to NA and gives a warning. |
recycle |
logical; if TRUE, recycle (rep) the
shorter ones of x, y or z if their lengths differ. |
A list with the components
x |
numeric (i.e., double) vector of abscissa values. |
y |
numeric vector of the same length as x. |
z |
numeric vector of the same length as x. |
xlab |
character(1) or NULL, the axis label of x. |
ylab |
character(1) or NULL, the axis label of y. |
zlab |
character(1) or NULL, the axis label of z. |
Uwe Ligges and Martin Maechler
xy.coords for 2D.
xyz.coords(data.frame(10*1:9, -4), y = NULL, z = NULL)
xyz.coords(1:6, stats::fft(1:6), z = NULL, xlab = "X", ylab = "Y")
y <- 2 * (x2 <- 10 + (x1 <- 1:10))
xyz.coords(y ~ x1 + x2, y = NULL, z = NULL)
xyz.coords(data.frame(x = -1:9, y = 2:12, z = 3:13), y = NULL, z = NULL,
log = "xy")
##> Warning message: 2 x values <= 0 omitted ...