>|I need to write some short examples of rhythm; I need
 >|only one line in the staff, but full-height bar lines.
 >|If I set \setlines11, the bar lines (also the start
 >|and end rules) are "invisible" (0pt height); but if I
 >|change the number of lines I get right bar lines. I
 >|have written many of these extracts some time ago, and
 >|this problem didn't exist. I think it's because of the
 >|value of \systemheight. I've tried with \showthe and
 >|several values of \setlines and I don't understand how
 >|\systemheight is set:
 >|
 >|\setlines11 > \systemheight = 0.0pt
 >|\setlines12 > \systemheight = 4.0pt
 >|\setlines13 > \systemheight = 16.0pt
 >|\setlines14 > \systemheight = 12.0pt
 >|\setlines15 > \systemheight = 16.0pt
 >|
 >|Is this right, or is it a bug? Can I change the height of
 >|the bar line?

musixdoc.pdf is very clear that \systemheight is "NOT to be
changed" (in italics).

A simple test shows that \systemheight has correct values
for 3 or more lines (though not for \setlines12). There's an
example with \setlines(n}1 in subsection 25.20 for musixper
in musixdoc.pdf. If you comment out \sepbarrules, you'll get
bar lines that cross the single-line staff, which might be
what you want. I don't understand why you want "full-height
bar lines" or even what that means when the relevant staff
has zero height.

In my opinion, systemheight of 0pt for \setlines11 is
correct, though it seems you want something different and
apparently it was different "some time ago". The code
for determining \systemheight in current musixtex.tex is
attributed to Werner Icking and is undated. There are old
versions of musixtex.tex here:

http://icking-music-archive.org/software/musixtex/

and even older ones here:

http://icking-music-archive.org/software/musixtex/older-versions/

Bob T.
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