[R] Fwd: only plot borders of a region in a scatter plot

[Duncan Murdoch]

On 04/08/2016 11:03 AM, William Dunlap via R-help wrote:
> If 'basinID' is the matrix of basin identifiers you could draw an outline
> of the basin with identifier 'ID' with
>    coutour( basiinID == ID, level=0.5)

Note the typo:  that should be

contour( basiinID == ID, level=0.5)

Duncan Murdoch

> Add 'add=TRUE' if you are overlaying this on an existing plot.
>
> Bill Dunlap
> TIBCO Software
> wdunlap tibco.com
>
> On Thu, Aug 4, 2016 at 1:51 AM, Zun Yin <yinzun2000 at gmail.com> wrote:
>
>> ​D​
>> ear all,
>>
>> I have a matrix with ID of river basins (integer numbers). Now I want to
>> highlight one river basin in a map by plotting only the border. Like the
>> attached figure. Two river basins are highlighted by polygons. It is
>> created by ferret, but I prefer to implement it by R. Anybody know how to
>> do it? Thanks a lot.
>>
>> Cheers,
>>
>> Zun Yin
>>
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>
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>
> ______________________________________________
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> and provide commented, minimal, self-contained, reproducible code.
>