[R] unexpected (?) behavior of box()

[Jim Lemon]

Yes, the Mercator projection unwraps the globe (360 degrees around)
while the poles are 180 degrees apart. It then stretches the result
into a rectangle. If you enter:

par("usr")

after drawing the world map you will see the proportions.

Jim

On Fri, Jan 7, 2022 at 7:20 PM ani jaya <gaaauul using gmail.com> wrote:
>
> Hi Jim,
>
> Thank you for the alternative. Absolutely will try it.
> Can you explain a bit about "Maps draws an approximately 2x1 plot"?
> Is it the size proportion 2 in x-axis and 1 in y-axis?
>
> On Fri, Jan 7, 2022 at 4:41 PM Jim Lemon <drjimlemon using gmail.com> wrote:
> >
> > Hi Ani,
> > Blame Mercator. Maps draws an approximately 2x1 plot. Maybe this:
> >
> > mappar<-par("usr")
> > rect(mappar[1],mappar[3],mappar[2],mappar[4])
> >
> > Jim
> >
> > On Fri, Jan 7, 2022 at 6:25 PM ani jaya <gaaauul using gmail.com> wrote:
> > >
> > > Dear R expert,
> > >
> > > I try to box a figure using box(). However it box the default margin,
> > > not the specified margin.
> > >
> > > #working as expected
> > > barplot(1:20)
> > > box()
> > >
> > > #working as expected, the box follow the margin
> > > par(mar=c(2, 6, 5, 4))
> > > barplot(1:20)
> > > box()
> > >
> > > #not working
> > > install.packages("maps")
> > > library(maps)
> > > par(mar=c(2, 6, 5, 4))
> > > m<-map('world', xlim = c(91, 142), ylim = c(25, 40),
> > >        lwd=1.5, col = "grey",border=NA, fill = T,  bg="white")
> > > box()
> > >
> > > #the turnaround
> > > par(mar=c(2, 6, 5, 4))
> > > m<-map('world', xlim = c(91, 142), ylim = c(25, 40),
> > >        lwd=1.5, col = "grey",border=NA, fill = T,  bg="white")
> > > par(mar=c(2, 6, 5, 4))
> > > box()
> > >
> > > I just curious with this behavior. Is it the problem with the package
> > > "map" or box() function?
> > > Thank you.
> > >
> > > > sessionInfo()
> > > R version 4.0.2 (2020-06-22)
> > > Platform: i386-w64-mingw32/i386 (32-bit)
> > > Running under: Windows 10 x64 (build 19043)
> > >
> > >
> > >
> > > Ani
> > >
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