problem with \noalign

problem with \noalign

[Tarik Kara]

The \noalign command does not work as expected (as I expect) inside
\eqaling{..}

When I type 

\placeformula[-]
\startformula
\eqalign{
    \forall s_{-i}\in S_{-i} \quad
          & h(s^{\ast}_{i},s_{-i})\pref{R_{i}} h(s_{i}',s_{-i}),\cr
    \noalign{\hbox{and}} %
    \exists s_{-i}\in S_{-i}\quad
         & h(s^{\ast}_{i},s_{-i})\pref{P_{i}}
           h(s_{i}',s_{-i})\enspace.\cr}
\stopformula

the `and` is aligned with \forall. I was expecting to be in the left
margin of the page. Is there a bug (I am using ConTeXt  ver: 2001.7.11) or
am I doing something wrong.

Thanks

Tar{\i}k

Re: problem with \noalign

[Hans Hagen]

At 10:22 PM 7/16/2001 +0300, Tarik Kara wrote:
>The \noalign command does not work as expected (as I expect) inside
>\eqaling{..}
>
>When I type
>
>\placeformula[-]
>\startformula
>\eqalign{
>     \forall s_{-i}\in S_{-i} \quad
>           & h(s^{\ast}_{i},s_{-i})\pref{R_{i}} h(s_{i}',s_{-i}),\cr
>     \noalign{\hbox{and}} %
>     \exists s_{-i}\in S_{-i}\quad
>          & h(s^{\ast}_{i},s_{-i})\pref{P_{i}}
>            h(s_{i}',s_{-i})\enspace.\cr}
>\stopformula
>
>the `and` is aligned with \forall. I was expecting to be in the left
>margin of the page. Is there a bug (I am using ConTeXt  ver: 2001.7.11) or
>am I doing something wrong.

The allignment is a box as a whole, so the 'and' will align to the side of 
the alignment. Same for plain.

There are some extensions to the context formula handling that permit you 
to align formulas left / right/ indented and so on, as well as to define 
alignment classes. Yet undocumented.

Hans
-------------------------------------------------------------------------
                                   Hans Hagen | PRAGMA ADE | pragma@wxs.nl
                       Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
  tel: +31 (0)38 477 53 69 | fax: +31 (0)38 477 53 74 | www.pragma-ade.com
-------------------------------------------------------------------------

Re: problem with \noalign

[Tarik Kara]

Dear Hans,

I checked the TeXbook and I noticed that I have used
\eqalign when I should \eqalignno. Sorry about this.
I am looking forward for more documentation on math.

Tar{\i}k

On Fri, 20 Jul 2001, Hans Hagen wrote:

> At 10:22 PM 7/16/2001 +0300, Tarik Kara wrote:
> >The \noalign command does not work as expected (as I expect) inside
> >\eqaling{..}
> >
> >When I type
> >
> >\placeformula[-]
> >\startformula
> >\eqalign{
> >     \forall s_{-i}\in S_{-i} \quad
> >           & h(s^{\ast}_{i},s_{-i})\pref{R_{i}} h(s_{i}',s_{-i}),\cr
> >     \noalign{\hbox{and}} %
> >     \exists s_{-i}\in S_{-i}\quad
> >          & h(s^{\ast}_{i},s_{-i})\pref{P_{i}}
> >            h(s_{i}',s_{-i})\enspace.\cr}
> >\stopformula
> >
> >the `and` is aligned with \forall. I was expecting to be in the left
> >margin of the page. Is there a bug (I am using ConTeXt  ver: 2001.7.11) or
> >am I doing something wrong.
> 
> The allignment is a box as a whole, so the 'and' will align to the side of 
> the alignment. Same for plain.
> 
> There are some extensions to the context formula handling that permit you 
> to align formulas left / right/ indented and so on, as well as to define 
> alignment classes. Yet undocumented.
> 
> Hans
> -------------------------------------------------------------------------
>                                    Hans Hagen | PRAGMA ADE | pragma@wxs.nl
>                        Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>   tel: +31 (0)38 477 53 69 | fax: +31 (0)38 477 53 74 | www.pragma-ade.com
> -------------------------------------------------------------------------
> 
>