Hi,
Thanks for your inputs Aditya and Bruce.
I’m still having some issues when trying to include the output of the filter
module within lua.
MNWE:
\defineexternalfilter
[sympy]
[filtercommand={/Users/aleks/miniconda3/bin/python3
\externalfilterinputfile\space > \externalfilteroutputfile},
bufferbefore=init,
output={\externalfilterbasefile.out},
readcommand=\typefile,
read=no,]
\startbuffer[init]
from sympy import *
\stopbuffer
\starttext
\startluacode
local deg2rad = [[
%\startsympy
print(latex(rad(%angleVal%)))
%\stopsympy
]]
local calcTrigFunction = [[
\startsympy
from sympy import *
print(latex(%fname%(rad(%angleVal%))))
\stopsympy
]]
local angleList = {0, 30, 45, 60, 90, 120, 135, 150, 180, 210, 225,
240, 270, 300, 315, 330, 360}
for _, a in ipairs(angleList) do
context.templates[calcTrigFunction] {
fname = "sin",
angleVal = a
}
end
\stopluacode
\stoptext
In particular, it fails as soon as \startsympy and \stopsympy are part of the
template. Should I protect these?
A. Christe
Le 25 oct. 2023 à 21:56 +0200, Aditya Mahajan <adit...@umich.edu>, a écrit :
> On Wed, 25 Oct 2023, Alexandre Christe wrote:
>
> > Dear list,
> >
> > I’d like to know the best approach to make this a bit more usable. I’m
> > trying to typeset a table with sin/cos/tan values. I’d like to be able to
> > convert the angles in degrees into radians (with math notation) and to
> > compute the trigonometric function leading to sin(pi/4) = 1/2, or cos(pi/6)
> > = sqrt(3)/2 and display it in math mode.
> >
> > Here’s my current MWE, where I fail to convert the angles in radians
>
> there is math.sind, cosd, etc. for computing sin for angle in degrees. The
> implementation is l-math.lua is:
>
> local pipi = 2*math.pi/360
>
> function math.sind(d) return sin(d*pipi) end
> function math.cosd(d) return cos(d*pipi) end
> function math.tand(d) return tan(d*pipi) end
>
> > and fail to display the result in symbolic form.
>
> Context doesn't do symbolic math. You can try checking if one of the symbolic
> math libraries in lua provides all the features that you want.
>
> > One possible way would be to use Python and the t-filter module, like this
>
> This can work as follows. Take the array of angles, and convert them to the
> desired format in python and write them to a temp file. Read that temp file
> in lua and typeset it as you want.
>
> Another option is an old proof of concept by Luigi:
> https://github.com/bastibe/lunatic-python which allowed two-way communication
> between python and luatex. Not sure if it still works.
>
> Aditya
>
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