Re: Extensible arrows in ConTeXT

[Mathias Schickel <msch@fa.uni-tuebingen.de>]

> Am 26.07.2017 um 00:47 schrieb Hans Hagen <pragma@wxs.nl>:
> 
> On 7/26/2017 12:01 AM, Mathias Schickel wrote:
>>> Am 22.07.2017 um 22:34 schrieb Alan Braslau <braslau.list@comcast.net <mailto:braslau.list@comcast.net>>:
>>> 
>>> On Fri, 21 Jul 2017 12:31:33 +0200
>>> Mathias Schickel <msch@fa.uni-tuebingen.de <mailto:msch@fa.uni-tuebingen.de>> wrote:
>>> 
>>>>> $\xrightarrow{}{}$
>>>> 
>>>> This throws errors. Any idea why?
>>>> 
>>>>> $\xrightoverleftarrow{}{33°C}$
>>>> 
>>>> 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

Hi Hans,

thank you for your quick answer! I am not sure How I can remake that format. Can you tell me the command for that? And can you maybe patch that in the distribution, too? (Else I fear that I have to remake that format every time I will update the distribution from contextgarden.)

Best
Mathias


> 
> 
> 
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