[R] Adding Two-Headed Arrow in map legend

[Miluji Sb]

Hello Jim,

Thanks again. I am getting the two-headed arrow but I cannot seem to get
the coordinates right for the arrow to appear beneath the map. These
coordinates puts the arrow on the left hand side. Thanks again!

Sincerely,

Milu

On Tue, Apr 12, 2016 at 1:15 PM, Jim Lemon <drjimlemon at gmail.com> wrote:

> Hi Milu,
> There is a two-headed arrow on the image you sent, and it seems to be
> where you specified. Did you want it beneath the map, as:
>
> par(xpd=TRUE)
> arrows(-22,54.75,-22,74,code=3)
> par(xpd=FALSE)
>
> Jim
>
> On Tue, Apr 12, 2016 at 7:58 PM, Miluji Sb <milujisb at gmail.com> wrote:
> > Dear Jim,
> >
> > Thanks again! I do want the arrows at the bottom (beneath the map). This
> is
> > what I am doing:
> >
> > # Draw the map
> > eps_europe <- mapCountryData(n, nameColumnToPlot="eps_score",
> mapTitle="EPS
> > Score - Europe",colourPalette=colourPalette,
> > catMethod="fixedWidth", missingCountryCol = "white", mapRegion="Europe",
> > addLegend=FALSE)
> >
> > # ISO3 codes on the map
> > text(n, labels="ISO3", cex=0.30)
> >
> > # Obtain coordinates for the arrow
> > par('usr')
> >
> > # -19.75966  54.75966  33.60000  71.40000
> >
> > # Arrows
> > par(xpd=TRUE)
> > arrows(-19.75966,  54.75966,  33.60000,  71.40000,code=3)
> > par(xpd=FALSE)
> >
> > As the output shows I cannot seem to get the correct coordinates for the
> > arrows. Thanks again.
> >
> > Sincerely,
> >
> > Milu
>
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