Hi Hans,

On Dec 6, 2022, at 2:15 AM, Hans Hagen via ntg-context wrote: On 12/6/2022 12:39 AM, Gavin via ntg-context wrote:

...

1) Is there a mathematics version of \hpos? The contents of \hpos are set as text, even when \hpos is in mathematics, so I wrote an \mpos macro that uses \hpos but sets the contents as display-style math. This isn’t great for spacing, and it does't adapt to different math styles. \framed has a math version, \mframed, that sets the contents in the appropriate math style. If anyone know a way to accomplish that with \hpos, I’d love to know.

there actually is a subsystem that keeps math as-is-it (styles and spacing and such), see attached

I tried using \mathboxanchored, and was able to get the bottom two equations shown here. (The top equation uses \hpos, for comparison.) There are two problems that I didn’t know how to fix. 1) The line connects to the box including the subscript or superscript, not just to the e. 2) I cannot make multiple connections to a single object, like the e^\mu in the center. If I try to connect top and bottom, I get no connections anywhere in the entire document. The code for the formulas is: \startformula % Each \connectboxanchors works alone, but both together make trouble: \connectboxanchors[top][top]{X}{Y} %\connectboxanchors[bottom][bottom]{Y}{Z} \mathboxanchored{X}{e}_\alpha \mathboxanchored{Y}{e}^\mu \mathboxanchored{Z}{e}_{\dot\beta} = \textfrac{1}{\sqrt{2}}\sigma_{\alpha\dot\beta}^\mu \stopformula I added code to turn the arrow produced by \connectboxanchors into my contraction overlay, but that doesn’t affect these issues.

in your example we need a way to anchor on just the 'e' right? or do you want it on the e + super/subscript?

Yes, we only need to anchor to e. Thanks! Gavin

On 12/7/2022 1:42 PM, Gavin via ntg-context wrote:

Hi List,

I solved my original problem 2, allowing me to reuse the same \hpos labels in different equations without interference. I added an equation counter and set up my custom math version of \hpos to use the count as part of the label internally. I tried to do this with a regular ConTeXt counter, but had all sorts of mysterious, wrong behavior. When I switched to using a Lua counter, everything worked immediately. So, while there is nothing brilliant about this solution, I’ll share it for anyone who might want to do something similar in the future.

Using this could work \newcount\SFNum \global\advance\SFNum\plusone \the\SFNum (you now use a (global) lua counter

The code I added is below, with some comments. The complete example file is attached. The result is two equations.

Each equation was written using the same labels (X,Y,Z), but internally they have separate sets, (1:X and 2:X, etc.).

The moral of the story for me: Use more Lua.

but ... work local ... so document.sfnum etc in order to avoid clashes

Gavin

% Lua counts the spin formulas \ctxlua{sfnum = 0} % Count starts at zero \def\sfID{\ctxlua{context(sfnum)}} % ConTeXt can call the count from Lua to use as an ID for each equation.

% Spin formulas increase the spin formula count and typeset the formula as usual. \define\startspinformula{ \ctxlua{sfnum = sfnum + 1} \startformula } \define\stopspinformula{\stopformula}

% My own \mpos uses the spin formula ID as part of the box label, then sets the contents as math. \define[2]\mpos{\hpos{\sfID:#1}{$#2$}}

% Two commands for requesting contractions (the connections between spinors), using the spin formula ID. \define[2]\contract{% \startpositionoverlay{graphics}% \setMPpositiongraphic{\sfID:#1}{mypos:contract}{to=\sfID:#2}% \stoppositionoverlay% } \define[2]\contractbelow{% \startpositionoverlay{graphics}% \setMPpositiongraphic{\sfID:#1}{mypos:contractbelow}{to=\sfID:#2}% \stoppositionoverlay% } Attached what you can do in a next upload (on the million math test files MS and I have by now)

Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl -----------------------------------------------------------------

Hi Hans and Mikael, This is amazing! Mikael's example works for me. I will start using these tools in my project, and I’ll tell you how it goes. It might be a couple weeks, because the physics is also quite challenging. Thank you! Gavin

On Dec 7, 2022, at 3:25 PM, Hans Hagen via ntg-context wrote:

On 12/7/2022 1:42 PM, Gavin via ntg-context wrote:

...

Hi List, I solved my original problem 2, allowing me to reuse the same \hpos labels in different equations without interference. I added an equation counter and set up my custom math version of \hpos to use the count as part of the label internally. I tried to do this with a regular ConTeXt counter, but had all sorts of mysterious, wrong behavior. When I switched to using a Lua counter, everything worked immediately. So, while there is nothing brilliant about this solution, I’ll share it for anyone who might want to do something similar in the future. attached an example by Mikael ... it should work with tonights update

Hans

----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl ----------------------------------------------------------------- <221206-3.mkxl>___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!

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Hi Hans, Mikael, These features are amazing! Many many thanks! Thanks also to Gavin for having stated so precisely these kinds of needs, so that Hans and Mikael could come up with this solution. Gavin, good luck with your project, and plaese share what you get at the end. Best regards : Otared

On 8 Dec 2022, at 07:14, Mikael Sundqvist via ntg-context wrote:

Hi,

On Thu, Dec 8, 2022 at 1:07 AM Gavin via ntg-context wrote:

...

Hi Hans and Mikael,

This is amazing! Mikael's example works for me. I will start using these tools in my project, and I’ll tell you how it goes.

Very good that it works and that it gets tested!

...

It might be a couple weeks, because the physics is also quite challenging.

Haha, I can imagine that the spinors are even more challenging. Good luck!

/Mikael ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context webpage : https://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : https://contextgarden.net ___________________________________________________________________________________

Otared Kavian e-mail: otared@gmail.com Phone: +33 6 88 26 70 95