```
# NOT RUN {
xyz.coords(data.frame(10*1:9, -4), y = NULL, z = NULL)
xyz.coords(1:5, stats::fft(1:5), 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 ...
# }
```

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