lines-methods: Plot an instance of the 'fvcom.grid' class and overlay the...
In ocean: Biophysical Oceanography Tools

Plot an instance of the fvcom.grid class and overlay the trajectories given by xy.

`x`	A `fvcom.grid` instance
`xy`	A `list` with matrices `x` and `y` components that contain the trajectories to plot. The columns of `xy$x` are plotted against the columns of `xy$y`, so each particle trajectory should be in a column and each time index in a row.
`plot.units`	The units for plotting. Either 'm' for meters or 'll' for latitude and longitude.
`xy.units`	The units of `xy`. Either 'm' for meters or 'll' for latitude and longitude.
`...`	Additional arguments to be passed to `matlines`.

{
# Create a set of random trajectories.
nodes = get.nodes(ocean.demo.grid)
set.seed(1)
x = apply(matrix(rnorm(1000, 0, 0.01), 250), 2, cumsum) - 69.5
y = apply(matrix(rnorm(1000, 0, 0.01), 250), 2, cumsum) + 42.5
lines(ocean.demo.grid, list(x=x, y=y), lty=1)
}