[NTG-context] Add arrow tips to axes in lmt_function

[Jairo A. del Rio]

Hi, list! I want to know how to add arrow tips for axes (x, y) to a
function. I did the following based on a luametafun example:

\starttext
\startMPcode{doublefun}
draw lmt_function
[
xmin=0, xmax=10,
xstep=.05,
ymin=-2, ymax=2,

code="1.5 * math.cosd(240 * math.sqrt(x))",

xlabels="no",ylabels="no",

sx=2mm, sy=4mm, linewidth=.025mm, offset=.1mm,]

xsized 8cm;
\stopMPcode
\stoptext

But I didn't find anywhere in manuals or the mailing list concerning
arrows, nor key-value pairs for lmt_function. Thank you in advance.

Best regards,

Jairo :)
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