Hi, Adam. There are some ways to do it. I'm sure there are many more, but I
don't remember them right now. Hi, Hans. There's a bug (?) in syst-lua.lua
related to \expression in MkIV (xmath and xcomplex aren't defined). Please
fix that


%Temporary hack for MkIV

%Only use it in case \expression ... \relax doesn't work

\startmkivmode

\startluacode

xmath = xmath or math

xcomplex = xcomplex or {} --maybe math too???

\stopluacode

\stopmkivmode

\starttext

$\pi = \ctxlua{context("\letterpercent.6f", math.pi)}$


$\pi = \expression string.format("\letterpercent.6f", pi)\relax$


%Changing catcodes so $ and % are letter characters

\startasciimode

\m{\pi = \expression ("%.6f"):format(pi) \relax}


\m{\pi = \ctxlua{context("%.6f", math.pi)}}

\stopasciimode

\stoptext

Regards,


Jairo

El sáb, 29 de may. de 2021 a la(s) 07:32, Adam Reviczky (reviczky@gmail.com)
escribió:

> Hi,
>
> I was trying to use a quick calculation like the new mathfun in lmtx for
> an older mkiv document.
>
> MWE from the wiki:
> https://wiki.contextgarden.net/Programming_in_LuaTeX#Examples
>
> \starttext
> $\pi = \ctxlua{context("\%.6f", math.pi)}$
> \stoptext
>
> But that gives an error (actually for both lmtx and mkiv): token call,
> syntax: [ctxlua]:1: invalid escape sequence near '"\%'
>
> Whereas
>
> \starttext
> $\pi = \startluacode context("%.6f", math.pi) \stopluacode$
> \stoptext
>
> Works fine as expected.
>
> Is there a way to escape the percentage sign in ctxlua as a format value?
>
> Adam
>
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