Plot a flow field

This function plots a flow field given as west-east and south-north velocity values at regularly spaced grid points.

quiver(u, v, xpos = col(u), ypos = row(u), add = FALSE, scale = 1)

Arguments

u

The west-east velocities as a matrix.

v

The south-north velocities as a matrix.

xpos

Positions of the arrowbases in x-direction.

ypos

Positions of the arrowbases in y-direction.

add

If TRUE, the flow field is added to the current plot.

scale

The length of the longest arrow is 'scale' * 'distance between grid points'.

See also

plot.arena

Author

Thorsten Lenser

Examples

data(Udata,Vdata,Sdata)
arena = prepare.arena(Udata,Vdata,Sdata)

# First use quiver only
quiver(arena$U,arena$V)
#> Warning: default 'pch' is smaller than number of columns and hence recycled


# Now use larger arrows, looks better in this case
quiver(arena$U,arena$V,scale=5)
#> Warning: default 'pch' is smaller than number of columns and hence recycled


# Together with the polygon structure
plot(arena,arrow_scale=5)