plot.xy(x, y, xlab=NULL, ylab=NULL)
x,y
|
the coordinates of points in the plot.
Alternatively, a single argument x can be be provided.
In this case, an attempt is made to interpret the
argument in a way suitable for plotting.
If the argument is a list containing components x and
y, these are used are assumed to define plotting coordinates;
if the argument contains a time series, the x values are
taken to be time and the y values to be the time series;
if the argument is a matrix with two columns, the first
is assumed to contain the x values and the second the
y values; in any other case, the argument is coerced to a vector
and the values plotted against their indices.
|
xlab,ylab
| names for the x and y variables to be extracted. |
plot.xy is used by many function to obtain
x and y coordinates for plotting.
The use of this common mechanism across all R functions
produces a measure of consistency.
plot and lowess are examples of functions
which use this mechanism.