unexpected behaviour of expression(sum())

Kurt has found a problem with the last two pages of demo(plotmath) on
X11 (some symbols either wrong or missing completely).

the issue seems to be that gsfonts-x11 has aliases

-adobe-symbol-medium-r-normal--0-0-0-0-p-0-adobe-fontspecific 

"-urw-standard symbols l-regular-r-normal--0-0-0-0-p-0-adobe-fontspecific" "-

Any way to ensure that these fonts are not taken by us?

I don't think so, for if I understand that the alias file is lying about
encodings. We specifically added "-adobe-symbol" to overcome problems with
abi symbol fonts at ETHZ, but if that package says the urw fonts in
`standard symbols l' are in adobe symbol and they are not, you are in
trouble.

On Friday 11 March 2005 13:13, Marc Schwartz wrote:

On Fri, 2005-03-11 at 17:17 +0000, Prof Brian Ripley wrote:

I see you have both a scalable font (the first) and size-specfic
fonts. My guess is that the scalable font is not encoded in the
same way as the others: can you track down where it is coming from?

Otherwise my list on FC3 is the same as yours (minus the
duplicates, which are also puzzling).  I have also just checked
Exceed, which has the same list plus scalable fonts (and also has

-adobe-symbol-0-0-normal--0-0-0-0-p-0-adobe-fontspecific
-adobe-symbol-0-0-normal--0-0-0-0-p-0-sun-fontspecific
-adobe-symbol-0-0-normal--0-0-100-100-p-0-adobe-fontspecific
-adobe-symbol-0-0-normal--0-0-100-100-p-0-sun-fontspecific
-adobe-symbol-0-0-normal--0-0-75-75-p-0-adobe-fontspecific
-adobe-symbol-0-0-normal--0-0-75-75-p-0-sun-fontspecific

which caused problems for 2.0.1 with getting bold symbols in some
sizes, hence the second bug fix I mentioned).

As a wild guess, do you have a font server as well as local fonts?

I don't think so. My XF86Config-4 file has the line
       FontPath        "unix/:7100"      # local font server
but I don't see any font server package actually installed, and I get

deepayan $ xfsinfo -server localhost:7100
xfsinfo:  unable to open server "localhost:7100"

. I do have fontconfig (and a bunch of fonts all over the place), which
may explain the duplicates.

[...]

Deepayan, which X server is being used? FC3 (fully updated) is using
xorg 6.8.1 if that might make a difference.

I'm using Debian testing, the version of X being 4.3.0.dfsg.1-10 (4.3.0
with some modifications). But this is not the issue, since things work
fine on another Debian system with the same version of X. It turns out
that the problem is with the gsfonts-x11 package. After removing it, I
get the correct symbols (with a warning message):

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

Warning message:
X11 used font size 8 when 9 was requested


There's still a bug, but probably not in R. The only external indication
I can get that something is wrong is when I compare

$ xfd -fn
-adobe-symbol-medium-r-normal--20-140-100-100-p-107-adobe-fontspecific

and

$ xfd -fn
-adobe-symbol-medium-r-normal--0-0-100-100-p-107-adobe-fontspecific

The second one claims to display

-urw-standard symbols
l-medium-r-normal--17-120-100-100-p-89-adobe-fontspecific

and in fact does *not* have the summation symbol. (Screenshots at

http://www.stat.wisc.edu/~deepayan/R/xfd-fixed.png and
http://www.stat.wisc.edu/~deepayan/R/xfd-scalable.png

). However, the file /usr/X11R6/lib/X11/fonts/Type1/fonts.dir has the
line

s050000l.pfb -urw-standard symbols
l-medium-r-normal--0-0-0-0-p-0-adobe-fontspecific

which suggests that the actual font used is s050000l.pfb, and a font
editor shows that it does contain the summation symbol (U+2211).

Deepayan