Thank you, Peter!
From xdpyinfo I got
screen #0:
dimensions: 5120x2880 pixels (903x508 millimeters)
resolution: 144x144 dots per inch
According to these specs my screen should have a sqrt((5120/144)^2 +
(2880/144)^2) = 40.8" diagonal.
However, in practice it is 27", so that perfectly explains the 1.5
factor difference.
In RStudio, dev.size() is not equal to par("fin"), which caused the
problem for me. I the R terminal, these two are equal. I'll post this in
the RStudio issue list.
Best,
Martijn
On 3/2/22 23:11, peter dalgaard wrote:
I don't know about RStudio, but in X11 this sort of thing can happen due to
misconfiguration of the display itself, i.e. not in R as such. Basically, it
relies on getting the correct dots-per-inch value from the display, and may
otherwise use some standard value.
What happens if you run xdpyinfo in a terminal window?
With XQuartz on an MB Air, I see
...
screen #0:
dimensions: 1440x876 pixels (381x232 millimeters)
resolution: 96x96 dots per inch
...
which is a multi-way lie! It is a 2560x1600 retina display, the resolution is way higher
than 96x96, and it is 13.3", whereas the stated dimensions corresponds to a 17"
diagonal.
However, systems may be "lying in the users best interest", since e.g. the
default for an X11() plot window is 7in square, which might not fit on a small laptop.
You are somewhat more likely to want the same relative size across different laptops.
- pd
On 2 Mar 2022, at 10:52 , Martijn Tennekes <mtenne...@gmail.com> wrote:
dev.size() does not return the correct screen size when using a 4K
screen. With the R console and a x11() device, it seems to overestimate
with factor 1.5, and in RStudio underestimate with factor 2.
See also https://github.com/rstudio/rstudio/issues/10723
Is this a bug, or is there something I can do?
Best,
Martijn Tennekes
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