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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