Re: [NTG-context] Extensible arrows in ConTeXT

25 Jul 2017


      On 7/26/2017 12:01 AM, Mathias Schickel wrote:
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Am 22.07.2017 um 22:34 schrieb Alan Braslau mailto:braslau.list@comcast.net>:
On Fri, 21 Jul 2017 12:31:33 +0200
Mathias Schickel mailto:msch@fa.uni-tuebingen.de> wrote:
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$\xrightarrow{}{}$
This throws errors. Any idea why?
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$\xrightoverleftarrow{}{33°C}$
This does work. Sadly it is not the arrow I want to have.
MWE:
\starttext
$A \xrightarrow{}{} B$
\stoptext
No problem here.
It seems to be a problem with the font I use.  Hans, do you have any 
idea why that does not work if I am using Minion Math? I am getting the 
following error:
attempt to get length of local 'charlist' (a nil value)
stack traceback:
...ext/tex/texmf-context/tex/context/base/mkiv/math-act.lua:514: in 
function 'horizontalcode'
...ext/tex/texmf-context/tex/context/base/mkiv/math-act.lua:541: in 
function <...ext/tex/texmf-context/tex/context/base/mkiv/math-act.lua:540>
(...tail calls...)
you can patch this in that file and remake the format

     elseif kind == e_right then
         local charlist = data[3].horiz_variants
         if charlist then
             local right = charlist[#charlist]
             roffset = abs((right["start"] or 0) - (right["end"] or 0))
         end


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