math: `\overbar` with fractions and subscripts

math: `\overbar` with fractions and subscripts

[Paul Menzel]

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Dear ConTeXt folks,


I do have some problem with the following example (also attached,
executed with `context test`).

        \starttext
        \startformula
        \overbar{q} = \frac{\overbar{q}}{\overbar{α_0}}
        \stopformula
        In text $\overbar{q} = \frac{\overbar{q}}{\overbar{α_0}}$.
        \startformula
        \overbar{q_0} = \frac{\overbar{q}}{\overbar α}
        \stopformula
        \stoptext

I am using the latest ConTeXt Minimals distribution.

        $ context --version
        
        MTXrun | main context file: /opt/context/tex/texmf-context/tex/context/base/context.mkiv
        MTXrun | current version: 2011.02.04 10:01

1. The bar divides for subscripts/indices.
2. If you look at the first fraction, the bar is as long as the stroke
from the fraction and therefore I think too long.
3. When inlining the fraction in text the bar fuses with the stroke from
the fraction.

Are these know problems or do I just use the wrong commands?


Thanks,

Paul

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\starttext
\startformula
\overbar{q} = \frac{\overbar{q}}{\overbar{α_0}}
\stopformula
In text $\overbar{q} = \frac{\overbar{q}}{\overbar{α_0}}$.
\startformula
\overbar{q_0} = \frac{\overbar{q}}{\overbar α}
\stopformula
\stoptext

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Re: math: `\overbar` with fractions and subscripts

[Otared Kavian]

Hi Paul,

I think one should use \overline instead of \overbar in your example. For me the following works fine with mkiv:
      \starttext
       \startformula
       \overline{q} = \frac{\overline{q}}{\overline{α_0}}
       \stopformula
       In text $\overline{q} = \frac{\overline{q}}{\overline{α_0}}$.
       \startformula
       \overline{q_0} = \frac{\overline{q}}{\overline α}
       \stopformula
       \stoptext
(one gets as expected the « conjugate » of α_0, for instance).

Best regards: OK
On 4 févr. 2011, at 12:14, Paul Menzel wrote:

> Dear ConTeXt folks,
> 
> 
> I do have some problem with the following example (also attached,
> executed with `context test`).
> 
>        \starttext
>        \startformula
>        \overbar{q} = \frac{\overbar{q}}{\overbar{α_0}}
>        \stopformula
>        In text $\overbar{q} = \frac{\overbar{q}}{\overbar{α_0}}$.
>        \startformula
>        \overbar{q_0} = \frac{\overbar{q}}{\overbar α}
>        \stopformula
>        \stoptext
> 
> I am using the latest ConTeXt Minimals distribution.
> 
>        $ context --version
> 
>        MTXrun | main context file: /opt/context/tex/texmf-context/tex/context/base/context.mkiv
>        MTXrun | current version: 2011.02.04 10:01
> 
> 1. The bar divides for subscripts/indices.
> 2. If you look at the first fraction, the bar is as long as the stroke
> from the fraction and therefore I think too long.
> 3. When inlining the fraction in text the bar fuses with the stroke from
> the fraction.
> 
> Are these know problems or do I just use the wrong commands?
> 
> 
> Thanks,
> 
> Paul
> <test.pdf><test.tex>___________________________________________________________________________________
> 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
> ___________________________________________________________________________________


___________________________________________________________________________________
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
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archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: math: `\overbar` with fractions and subscripts

[Paul Menzel]

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Dear Otared,


Am Freitag, den 04.02.2011, 20:45 +0100 schrieb Otared Kavian:

> I think one should use \overline instead of \overbar in your example. For me the following works fine with mkiv:
>       \starttext
>        \startformula
>        \overline{q} = \frac{\overline{q}}{\overline{α_0}}
>        \stopformula
>        In text $\overline{q} = \frac{\overline{q}}{\overline{α_0}}$.
>        \startformula
>        \overline{q_0} = \frac{\overline{q}}{\overline α}
>        \stopformula
>        \stoptext
> (one gets as expected the « conjugate » of α_0, for instance).

thank you for your answer. `\overline` works as you say, but it looks
typographically different in the respect that the bar is closer to the
letter, which of course solves the issue for the inline fraction. For α
this looks quite strange in my eyes. But I do not know a lot about
typography.

Please find the PDF-output attached with the following ConTeXt version.

	MTXrun | current version: 2011.02.04 10:01


Thanks,

Paul

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___________________________________________________________________________________
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
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archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: math: `\overbar` with fractions and subscripts

[Aditya Mahajan]

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On Mon, 7 Feb 2011, Paul Menzel wrote:

> thank you for your answer. `\overline` works as you say, but it looks
> typographically different in the respect that the bar is closer to the
> letter, which of course solves the issue for the inline fraction. For α
> this looks quite strange in my eyes. But I do not know a lot about
> typography.

IIRC, \overline is meant for long entities, like \overline{(a+b)}. For 
single letters, it is better to use the accent \bar.

Aditya

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___________________________________________________________________________________
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
___________________________________________________________________________________