R: plot centre as vectors

uvplot {dualtrees}

R Documentation

plot centre as vectors

Description

display the radial and angular component of the spectrum's centre as arrows.

Usage

uvplot(uv, z = NULL, x = NULL, y = NULL, col = "green",
  zcol = grDevices::gray.colors(32, 0, 1), n = 42, f = 1,
  length = 0.05, ...)

Arguments

`uv`	an array of dimension `nx x ny x 2` , containing the u- and v-component, result of `cen2uv`
`z`	image to show in the background, defaults to `sqrt(x^2+y^2)`
`x`, `y`	optional x- and y-coordinates for the plot, must match the dimensions of `z`
`col`	color of the arrows
`zcol`	color scale for the image
`n`	number of arrows in one direction
`f`	factor by which to enlarge the arrows
`length`	length of the arrowhead in inches
`...`	further arguments passed to `image`

Details

The pivot of the arrows is at the location to which the u- and v-component belong. No arrowhead is displayed since the egdges detcted by the cdtwt have an orientation but no sign. The default size of the arrows is such that a 'velocity' of 1 corresponds to 5% of the shorter image side.

Examples

uv <- cen2uv( dt2cen( fld2dt( blossom ) ) )
uvplot( uv, z=blossom )