[R] Help: add arrows on a filled.contour figure

[Roger Peng]

You need to use the 'plot.axes' argument.  See the help page.

Try this:

filled.contour(1:nx,1:nz,u,col=gray(rev((0:20/20))), plot.axes = { for (j
in zseq ) for (i in xseq)
arrows(i,j,i+u[i,j],j+w[i,j],length=angleng,angle=angarrow,code=2,
lwd=1,col="black") })


-roger
_______________________________
UCLA Department of Statistics
rpeng at stat.ucla.edu
http://www.stat.ucla.edu/~rpeng

On Wed, 4 Dec 2002, Z Cui wrote:

> Dear All
> 
> I would like to use filled.contour to plot something with arrows on it. I did it in this way:
> 
> filled.contour(1:nx,1:nz,u,col=gray(rev((0:20/20))))
> for (j in zseq ) for (i in xseq) arrows(i, j, i+u[i,j],j+w[i,j],length=angleng,angle=angarrow,code=2, lwd=1,col="black")
> 
> The peoblem is that the arrows use the whole device area, including the key on the right hand side of the filled contour. Does anyone know how to work out this problem?
> 
> Many thanks for your kind reply.
> Dr Zhiqiang Cui
> School of Geography and Environmental Sciences
> The University of Birmingham
> Edgbaston, Birmingham
> B15 2TT
> 
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