[R] Plot in real unit (1:1)

[Jim Lemon]

Hi Christian,
Well, it almost worked. I suspect that the postscript device adds some
padding to account for the printable area, so with a bit of
experimentation, The following example seems to do what you want. When
I printed the resulting file from the GIMP, the box and diamond were
the correct dimensions.

postscript("test.ps",paper="a4",horizontal=FALSE)
par(mai=c(1.713,0,1.713,0),xaxs="i",yaxs="i")
plot(0,type="n",xlim=c(0,190),ylim=c(0,190),xlab="",axes=FALSE)
segments(c(0,95),c(95,0),c(190,95),c(95,190))
segments(c(45,95,145,95),c(95,145,95,45),
 c(95,145,95,45),c(145,95,45,95))
box()
dev.off()

Jim

On Thu, Jun 7, 2018 at 8:16 AM, Jim Lemon <drjimlemon using gmail.com> wrote:
> Hi Christian,
> When I have to do something like this, I usually write it in
> Postscript using this:
>
> /def mm 2.8346 mul
>
> that converts a dimension in mm to points (1/72 inch). However, this
> won't work in R. It may be possible to set up the device like this:
>
> postscript("myfile.ps",paper="a4")
> par(mar=c(0,0,0,0))
> # generate a blank plot
> plot(0,type="n",xlim=c(0,210),ylim=c(0,297),axes=FALSE)
> # display lines, etc. in mm with 0,0 at the bottom left
> dev.off()
>
> The resulting file should be printable. Warning, I don't have time to
> test this right now.
>
> Jim
>
>
>
> On Thu, Jun 7, 2018 at 12:00 AM, Christian Brandstätter
> <bran.chri using gmail.com> wrote:
>> Dear List,
>>
>> Is it possible to plot in R in "real" units? I would like to draw a
>> plot on A4 paper, where 1 plot unit would be a mm in reality. Is
>> something like that possible? I would also like to be able to scale the
>> plot in x and y direction.
>> Background: For a project I would have to draw around 65 fast sketches
>> of elevation courves.
>>
>> Copied from here, due to no answer: https://stackoverflow.com/questions
>> /50606797/plot-in-real-units-mm
>>
>> Thank you!
>>
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