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 and fail
to display the result in symbolic form.
\starttext
\startluacode
local angleList = {0, 30, 45, 60, 90, 120, 135, 150, 180, 210, 225, 240, 270,
300, 315, 330, 360}
context.bTABLE()
context.bTR()
context.bTD() context("$x$") context.eTD()
context.bTD() context("$0$") context.eTD()
for _, a in ipairs(angleList) do
context.bTD() context("$\letterpercent.0f$",a) context.eTD()
end
context.eTR()
context.bTR()
context.bTD() context("$\\cos(x)$") context.eTD()
for _, a in ipairs(angleList) do
context.bTD() context("$\letterpercent.3f$",math.cos(math.rad(a)))
context.eTD()
end
context.eTR()
context.bTR()
context.bTD() context("$\\sin(x)$") context.eTD()
for _, a in ipairs(angleList) do
context.bTD() context("$\letterpercent.3f$",math.sin(math.rad(a)))
context.eTD()
end
context.eTR()
context.bTR()
context.bTD() context("$\\tan(x)$") context.eTD()
for _, a in ipairs(angleList) do
if a == 90 or a == 270 then
context.bTD() context("$-$") context.eTD()
else
context.bTD() context("$\letterpercent.3f$",math.tan(math.rad(a)))
context.eTD()
end
end
context.eTR()
context.eTABLE()
\stopluacode
\stoptext
\stoptext
One possible way would be to use Python and the t-filter module, like this
\usemodule[filter]
%It depends on your OS. In mine it's python3
\defineexternalfilter
[pythontyping]
[filtercommand={python3 \externalfilterinputfile \space >
\externalfilteroutputfile},
output={\externalfilterbasefile.tex},
cache=yes,
readcommand=\typefile,
spacebefore=medium,
spaceafter=medium]
%We copy settings to save typing
\defineexternalfilter[pythonformula][pythontyping]
%But instead of typing, we input a formula
\setupexternalfilter[pythonformula]
[readcommand=\samplefile] %\input should also work
\starttext
Convert angle to radians:
$\startpythonformula
from sympy import *
print(latex(pi/180*60))
\stoppythonformula$
Compute trigonometric function:
$\startpythonformula
from sympy import *
print(latex(cos(pi/3)))
\stoppythonformula$
\stoptext
However, I haven’t managed so far to combine things (lua and Python) in an
automatic way.
How should I proceed?
A. Christe
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