unexpected behaviour of expression(sum())

On Thu, 10 Mar 2005, Marc Schwartz wrote:

On Thu, 2005-03-10 at 19:57 -0600, Deepayan Sarkar wrote:

I'm seeing inconsistent symbols from the same expression with the
following code:


expr = expression(sum(x, 1, n))
plot(1, main = expr, type = "n")
text(1, 1, expr)


Moreover, the inconsistency is reversed in r-devel compared to R
2.0.1. In particular, the main label shows a \bigoplus instead of
\sum in r-devel, and the other way round in 2.0.1. demo(plotmath)
shows \sum in both.

Can anyone confirm? Is this intended behaviour (though I can't see
how)?

No problem in "Version 2.0.1 Patched (2005-03-07)". I get \sum in
both places. I do not see anything in the NEWS file suggesting a
bug fix for this.

I just installed "Version 2.1.0 Under development (unstable)
(2005-03-11)" and do not see the problem there either.

Both are under FC3.

We need to know both the device and the locale.  Assuming this is
X11, there are two fixes for font selection:

Yes, it's X11, with locale "C". It doesn't happen with postscript (I 
haven't tried anything else).

I had tried on 3 different machines other than my desktop, but all 
remotely. Marc's reply suggested that this was a problem with X on my 
local machine, and I haven't yet had a chance to check on any others.

     o X11() was only scaling its fonts to pointsize if the dpi
  was within 0.5 of 100dpi.

     o X11() font selection was looking for any symbol font, and
  sometimes got e.g. bold italic if the server has such a font.

The main title in plot() and text() are asking for different sizes.
If Deepayan had problems with getting a valid (Adobe symbol-encoded)
font, this might vary by size which would explain the reported
differences.

Deepayan: can you please check what symbol fonts you have: the
pattern in R-devel is

"-adobe-symbol-medium-r-*-*-*-*-*-*-*-*-*-*"

(Ideally we would select on encoding, but that is usually
'fontspecific' so not helpful.)

I'm not really sure what I'm looking for, but everything I get seems to 
be 'fontspecific':

deepayan $ xlsfonts | grep adobe-symbol-medium
-adobe-symbol-medium-r-normal--0-0-0-0-p-0-adobe-fontspecific
-adobe-symbol-medium-r-normal--0-0-100-100-p-0-adobe-fontspecific
-adobe-symbol-medium-r-normal--0-0-75-75-p-0-adobe-fontspecific
-adobe-symbol-medium-r-normal--10-100-75-75-p-61-adobe-fontspecific
-adobe-symbol-medium-r-normal--10-100-75-75-p-61-adobe-fontspecific
-adobe-symbol-medium-r-normal--11-80-100-100-p-61-adobe-fontspecific
-adobe-symbol-medium-r-normal--11-80-100-100-p-61-adobe-fontspecific
-adobe-symbol-medium-r-normal--12-120-75-75-p-74-adobe-fontspecific
-adobe-symbol-medium-r-normal--12-120-75-75-p-74-adobe-fontspecific
-adobe-symbol-medium-r-normal--14-100-100-100-p-85-adobe-fontspecific
-adobe-symbol-medium-r-normal--14-100-100-100-p-85-adobe-fontspecific
-adobe-symbol-medium-r-normal--14-140-75-75-p-85-adobe-fontspecific
-adobe-symbol-medium-r-normal--14-140-75-75-p-85-adobe-fontspecific
-adobe-symbol-medium-r-normal--17-120-100-100-p-95-adobe-fontspecific
-adobe-symbol-medium-r-normal--17-120-100-100-p-95-adobe-fontspecific
-adobe-symbol-medium-r-normal--18-180-75-75-p-107-adobe-fontspecific
-adobe-symbol-medium-r-normal--18-180-75-75-p-107-adobe-fontspecific
-adobe-symbol-medium-r-normal--20-140-100-100-p-107-adobe-fontspecific
-adobe-symbol-medium-r-normal--20-140-100-100-p-107-adobe-fontspecific
-adobe-symbol-medium-r-normal--24-240-75-75-p-142-adobe-fontspecific
-adobe-symbol-medium-r-normal--24-240-75-75-p-142-adobe-fontspecific
-adobe-symbol-medium-r-normal--25-180-100-100-p-142-adobe-fontspecific
-adobe-symbol-medium-r-normal--25-180-100-100-p-142-adobe-fontspecific
-adobe-symbol-medium-r-normal--34-240-100-100-p-191-adobe-fontspecific
-adobe-symbol-medium-r-normal--34-240-100-100-p-191-adobe-fontspecific
-adobe-symbol-medium-r-normal--8-80-75-75-p-51-adobe-fontspecific
-adobe-symbol-medium-r-normal--8-80-75-75-p-51-adobe-fontspecific
deepayan $ 

-Deepayan