vecplot: Plotting vector fields

In adeckmyn/meteogrid: Gridded meteorological data

Plotting vector fields

Description

A simple and primitive function for plotting vector fields.

Usage

vecplot(U,V,x=1:dim(U)[1],y=1:dim(U)[2],thinx=10,thiny=thinx,
                aspect, add=FALSE, arrowcolor=1, arrowsize=.03,
                maxscale=.9, lwd=.5, rescale, xlab="", ylab="", ...)

Arguments

U, V	2 matrices containing the X and Y components of the field.
x, y	2 vectors with the x and y coordinates of the grid points.
thinx, thiny	Thinning of the grid points. Vectors are only drawn every thinx,thiny points.
aspect	Aspect ratio. By default it is set to 1, i.e. the X and Y axes have the same units. For e.g. Lat-Lon maps, this is wrong!
arrowcolor	Color of the vectors.
arrowsize	Size of the actual "arrow" part of the vector.
maxscale	Scaling of vector lengths vs grid interval.
add	If TRUE, the vectors are added to an existing plot.
lwd	line width
rescale	Another way to rescale the vector lengths.
xlab, ylab	Labels for the X and Y axes. Default is to leave them clear.
...	Options for 'arrows'.

Details

The vector field is plotted using the "arrow" function. This is quite promitive. Also, it means that the vectors are bound to the co-ordinate system of the underlying plot. In other words: the X and Y axis should have the same units. If this is not the case, the aspect ratio (asp) should be adapted manually.

Value

A vector field plot.

adeckmyn/meteogrid documentation built on Jan. 13, 2025, 11:02 p.m.