In ?xy.coords it says:
If 'y' is missing and 'x' is a
formula: of the form 'yvar ~ xvar'. 'xvar' and 'yvar' are used as
x and y variables.
list: containing components 'x' and 'y', these are used to define
plotting coordinates.
time series: the x values are taken to be 'time(x)' and the y
values to be the time series.
matrix with two columns: the first is assumed to contain the x
values and the second the y values.
however, in fact, if y is missing an error is given. e.g.
x <- 1:3
y <- 4:6
xy.coords(y ~ x) # error
xy.coords(cbind(x, y)) # error
xy.coords(ts(y)) # error
Looking at the code, is.null(y) in the first line of the
body should be missing(y) .
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