Actually I believe there is a way to do this, using the low level control
resource cnConpackParams. See
http://ngwww.ucar.edu/ngdoc/ng/ref/hlu/obj/ContourPlot.res.html#cnConpackParams
Basically you would set the LLU parameters HLX and HLY (High/Low Search
Radius in X and Y) to sufficiently large numbers that the whole scalar
field is included in a single search for highs and lows. The
cnConpackParams doc includes a link to the LLU descriptions of these
parameters. But basically I have found (in a very cursory test) that if
I set these parameters to values larger than the dimension sizes of my
data, I get the desired single high and low.
Here is the incantation you need using the straight NCL interface,
assuming you have created a ContourPlot object named "contour":
setvalues contour
"cnConpackParams" : (/ "HLX:1000","HLY:1000"/)
end setvalues
-dave
On Tue, 30 Sep 2003, Sylvia Murphy wrote:
> Hi Dave,
>
> at present there is no way to do this. there is no resource that says plot
> only one label. how would you choose out of an array of locations which
> one the user wanted. It might be the highest high or the lowest high etc.
>
> sm
>
>
> On Tue, 30 Sep 2003, David B. Reusch wrote:
>
> > Hello,
> >
> > I've just stumbled across the High/Low labels feature
> > of the contouring resources (great stuff!) but have
> > an unanswered question: is it possible to limit the
> > number of High/Low labels to just one per plot? I'd
> > be quite happy to only have one 'H' and one 'L' in
> > each plot and have ncl ignore the other relative
> > maxima/minima.
> >
> > The labeling feature works fine most of the time, at
> > least for my data, but I have lots of examples where
> > a bit more control over how many labels appear would
> > be a really nice feature.
> >
> > we're running version 4.2.0.a030 on Unix.
> >
> > thanks,
> > dave
> >
> > ----------
> > Department of Geosciences | Reality is merely an illusion,
> > 517 Deike Building | albeit a very persistent one.
> > Penn State University | -- Albert Einstein
> > University Park, PA 16802 |
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>
>
>
> ******************************************************
> Sylvia Murphy EML: murphys@ucar.edu
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>
>
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