Horizontal space in math subscript generated by Lua

Horizontal space in math subscript generated by Lua

[Procházka Lukáš Ing. - Pontex s. r. o.]

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Hello,

I encountered a strange effect. Let's have a code that generates the same math, firstly by Ctx and secondly by Lua:

---
\starttext
   \startformula
     M_{t,WnT} = 1000
   \stopformula

   \startluacode
     context.startformula()
       context("M_{t,WnT} = 1000")
     context.stopformula()
   \stopluacode
\stoptext
---

You can see the result - the space between "W" and "n" in lower index is smaller when generated (natively) by Ctx than that in math generated by Lua. (The latter case may affect a bit "disturbingly" to the reader.)

It seems also that space between (subscript) "T" and "=" varies.

So why these differences? How to avoid the extra-space when Lua generates math subscript?

Best regards,

Lukas


-- 
Ing. Lukáš Procházka [mailto:LPr@pontex.cz]
Pontex s. r. o.      [mailto:pontex@pontex.cz] [http://www.pontex.cz]
Bezová 1658
147 14 Praha 4

Tel: +420 244 062 238
Fax: +420 244 461 038

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\starttext
  \startformula
    M_{t,WnT} = 1000
  \stopformula

  \startluacode
    context.startformula()
      context("M_{t,WnT} = 1000")
    context.stopformula()
  \stopluacode
\stoptext

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Re: Horizontal space in math subscript generated by Lua

[Hans Hagen]

On 14-12-2010 12:25, Procházka Lukáš Ing. - Pontex s. r. o. wrote:
> Hello,
>
> I encountered a strange effect. Let's have a code that generates the
> same math, firstly by Ctx and secondly by Lua:
>
> ---
> \starttext
> \startformula
> M_{t,WnT} = 1000
> \stopformula
>
> \startluacode
> context.startformula()
> context("M_{t,WnT} = 1000")
> context.stopformula()
> \stopluacode
> \stoptext
> ---
>
> You can see the result - the space between "W" and "n" in lower index is
> smaller when generated (natively) by Ctx than that in math generated by
> Lua. (The latter case may affect a bit "disturbingly" to the reader.)
>
> It seems also that space between (subscript) "T" and "=" varies.
>
> So why these differences? How to avoid the extra-space when Lua
> generates math subscript?


actually, the luacode was doing the right thing as there is a 
protect/unprotect mismatch (will be fixed); putting this at the top of 
you file works:

     \catcodetable\ctxcatcodes

I have no clue yet where the space comes from (that's taco's speciality)

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Horizontal space in math subscript generated by Lua

[Procházka Lukáš Ing. - Pontex s. r. o.]

Hello,

On Wed, 15 Dec 2010 13:06:42 +0100, Hans Hagen <pragma@wxs.nl> wrote:

> actually, the luacode was doing the right thing as there is a protect/unprotect mismatch (will be fixed); puttingthis at the top of you file works:
>
> \catcodetable\ctxcatcodes

thank you, Hans.

This makes both solutions (Ctx generated and Lua generated) equal - [wider] spacing is the same.

Just my point of view - the previous native Ctx result (= narrower spacing in subscript when mixing upper and lower case letters) - seemed to me a bit prettier; wouldn't be better to keep the "old" Ctx look (= result without \catcodetable\ctxcatcodes) and to drive Lua to give the same result?

Best regards,

Lukas


-- 
Ing. Lukáš Procházka [mailto:LPr@pontex.cz]
Pontex s. r. o.      [mailto:pontex@pontex.cz] [http://www.pontex.cz]
Bezová 1658
147 14 Praha 4

Tel: +420 244 062 238
Fax: +420 244 461 038

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

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Horizontal space in math subscript generated by Lua

[Hans Hagen]

On 15-12-2010 6:11, Procházka Lukáš Ing. - Pontex s. r. o. wrote:
> Hello,
>
> On Wed, 15 Dec 2010 13:06:42 +0100, Hans Hagen <pragma@wxs.nl> wrote:
>
>> actually, the luacode was doing the right thing as there is a
>> protect/unprotect mismatch (will be fixed); puttingthis at the top of
>> you file works:
>>
>> \catcodetable\ctxcatcodes
>
> thank you, Hans.
>
> This makes both solutions (Ctx generated and Lua generated) equal -
> [wider] spacing is the same.
>
> Just my point of view - the previous native Ctx result (= narrower
> spacing in subscript when mixing upper and lower case letters) - seemed
> to me a bit prettier; wouldn't be better to keep the "old" Ctx look (=
> result without \catcodetable\ctxcatcodes) and to drive Lua to give the
> same result?

no, the question is why the spacing in math is there, the catcode regime 
should indeed be ctxcatcodes ... more something for aditya to figure out

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________