# Re: [Rd] unexpected behaviour of expression(sum())

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Sun 13 Mar 2005 - 07:36:29 GMT

I suspect this is a problem in how the X server is using Type1 fonts, specifically in how it thinks they are encoded. This is why I asked about the locale: \summation is \345 in the Adobe symbol character set and \circleplus is \305 which is a u/case to l/case difference in Latin-1.

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

We found

```>> the issue seems to be that gsfonts-x11 has aliases
>>
```
>> "-urw-standard symbols l-regular-r-normal--0-0-0-0-p-0-adobe-fontspecific" "- urw-standard symbols l-medium-r-normal--0-0-0-0-p-0-adobe-fontspecific"

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

Brian

On Sat, 12 Mar 2005, Deepayan Sarkar 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
>>>
>>>
>>> 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
```>
```

> and
```>
```

> \$ xfd -fn
```>
```

> The second one claims to display
```>
```

> -urw-standard symbols
```>
```

> 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
```>
```

> 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

>
>
```--
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

______________________________________________
R-devel@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
```
Received on Mon Mar 14 10:33:57 2005

This archive was generated by hypermail 2.1.8 : Mon 20 Feb 2006 - 03:21:01 GMT