* intertext for aligned equations
@ 2006-03-27 7:23 Aditya Mahajan
2006-03-27 9:02 ` Taco Hoekwater
0 siblings, 1 reply; 9+ messages in thread
From: Aditya Mahajan @ 2006-03-27 7:23 UTC (permalink / raw)
Hi,
I was looking at trying to implement something similar to
amsmath's intertext command. I can get the basic functionality working
as follows.
\def\startintertext#1\stopintertext{%
\noalign{#1}\NR}
\startformula \startalign
\NC A_1 \NC= \left| \int_0^1 (x^2 - 3x)\, dx \right|
+ \left| \int_1^2 (x^2 -5x + 6)\, dx \right| \NR
\startintertext
Take limis of both integrals %\input tufte
\stopintertext
\NC \NC = \left| \frac{x^3}{3} - \frac{3}{2} x^2 \right|_0^1
+ \left| \frac {x ^3}{3} - 7 \frac{5}{2} x^2 + 6x \right|_1^2 \NR
\NC \NC = \left| - \frac{7}{6} \right| + \left|\frac{14}{3} -
\frac{23}{6}\right| = \frac{7}{6} + \frac{5}{6} = 2 \NR
\stopalign \stopformula
This seems to be working fine. However, \intertext defined in
amsmath.sty seems to be doing a lot more (I just can't figure out
what it is doing?) Can someone suggest how to make the above command
more robust on the lines of \intertext?
%----- from amsmath.sty -------------
\def\intertext@{%
\def\intertext##1{%
\ifvmode\else\\\@empty\fi
\noalign{%
\penalty\postdisplaypenalty\vskip\belowdisplayskip
\vbox{\normalbaselines
\ifdim\linewidth=\columnwidth
\else \parshape\@ne \@totalleftmargin \linewidth
\fi
\noindent##1\par}%
\penalty\predisplaypenalty\vskip\abovedisplayskip%
}%
}}
Thanks,
Aditya
--
Aditya Mahajan, EECS Systems, University of Michigan
http://www.eecs.umich.edu/~adityam || Ph: 7342624008
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: intertext for aligned equations
2006-03-27 7:23 intertext for aligned equations Aditya Mahajan
@ 2006-03-27 9:02 ` Taco Hoekwater
2006-03-27 12:27 ` Hans Hagen
` (2 more replies)
0 siblings, 3 replies; 9+ messages in thread
From: Taco Hoekwater @ 2006-03-27 9:02 UTC (permalink / raw)
Hi,
Aditya Mahajan wrote:
> This seems to be working fine. However, \intertext defined in
> amsmath.sty seems to be doing a lot more (I just can't figure out
> what it is doing?) Can someone suggest how to make the above command
> more robust on the lines of \intertext?
It inserts a post/pre-display skip&penalty pair around the intertext,
then creates a \vbox for use a paragraph. The result is (almost) as if
it the text was part of the 'normal' text flow between two displays.
I cannot tell you if this would work exactly the same as expected in
ConTeXt (needs further testing), but a context-like solution would
look like this:
\def\startintertext#1\stopintertext{%
\noalign{\dointertext{#1}}\NR}
\unexpanded\def\dointertext#1%
{\penalty\postdisplaypenalty
\afterdisplayspace % the matching \before... is not needed
\vbox{\forgetall \noindent #1\par}%
\penalty\postdisplaypenalty }
Cheers, taco
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: intertext for aligned equations
2006-03-27 9:02 ` Taco Hoekwater
@ 2006-03-27 12:27 ` Hans Hagen
2006-03-27 13:53 ` Taco Hoekwater
2006-03-27 12:50 ` Hans Hagen
2006-03-29 6:42 ` Aditya Mahajan
2 siblings, 1 reply; 9+ messages in thread
From: Hans Hagen @ 2006-03-27 12:27 UTC (permalink / raw)
Taco Hoekwater wrote:
> Hi,
>
> Aditya Mahajan wrote:
>
>
>> This seems to be working fine. However, \intertext defined in
>> amsmath.sty seems to be doing a lot more (I just can't figure out
>> what it is doing?) Can someone suggest how to make the above command
>> more robust on the lines of \intertext?
>>
>
> It inserts a post/pre-display skip&penalty pair around the intertext,
> then creates a \vbox for use a paragraph. The result is (almost) as if
> it the text was part of the 'normal' text flow between two displays.
>
> I cannot tell you if this would work exactly the same as expected in
> ConTeXt (needs further testing), but a context-like solution would
> look like this:
>
> \def\startintertext#1\stopintertext{%
> \noalign{\dointertext{#1}}\NR}
>
> \unexpanded\def\dointertext#1%
> {\penalty\postdisplaypenalty
> \afterdisplayspace % the matching \before... is not needed
> \vbox{\forgetall \noindent #1\par}%
> \penalty\postdisplaypenalty }
>
can someone wrap up the accumulated patches/suggestions for the math environments?
Hans
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
| www.pragma-pod.nl
-----------------------------------------------------------------
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: intertext for aligned equations
2006-03-27 9:02 ` Taco Hoekwater
2006-03-27 12:27 ` Hans Hagen
@ 2006-03-27 12:50 ` Hans Hagen
2006-03-29 6:42 ` Aditya Mahajan
2 siblings, 0 replies; 9+ messages in thread
From: Hans Hagen @ 2006-03-27 12:50 UTC (permalink / raw)
Taco Hoekwater wrote:
> Hi,
>
> Aditya Mahajan wrote:
>
>
>> This seems to be working fine. However, \intertext defined in
>> amsmath.sty seems to be doing a lot more (I just can't figure out
>> what it is doing?) Can someone suggest how to make the above command
>> more robust on the lines of \intertext?
>>
>
> It inserts a post/pre-display skip&penalty pair around the intertext,
> then creates a \vbox for use a paragraph. The result is (almost) as if
> it the text was part of the 'normal' text flow between two displays.
>
> I cannot tell you if this would work exactly the same as expected in
> ConTeXt (needs further testing), but a context-like solution would
> look like this:
>
> \def\startintertext#1\stopintertext{%
> \noalign{\dointertext{#1}}\NR}
>
> \unexpanded\def\dointertext#1%
> {\penalty\postdisplaypenalty
> \afterdisplayspace % the matching \before... is not needed
> \vbox{\forgetall \noindent #1\par}%
> \penalty\postdisplaypenalty }
>
>
added (preliminary) but i need an example of usage for the core-mat file/docu -)
Hans
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
| www.pragma-pod.nl
-----------------------------------------------------------------
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: intertext for aligned equations
2006-03-27 9:02 ` Taco Hoekwater
2006-03-27 12:27 ` Hans Hagen
2006-03-27 12:50 ` Hans Hagen
@ 2006-03-29 6:42 ` Aditya Mahajan
2006-03-29 7:49 ` Taco Hoekwater
2 siblings, 1 reply; 9+ messages in thread
From: Aditya Mahajan @ 2006-03-29 6:42 UTC (permalink / raw)
<--- On Mar 27, Taco Hoekwater wrote --->
>
>
> Hi,
>
> Aditya Mahajan wrote:
>
>> This seems to be working fine. However, \intertext defined in
>> amsmath.sty seems to be doing a lot more (I just can't figure out
>> what it is doing?) Can someone suggest how to make the above command
>> more robust on the lines of \intertext?
>
> It inserts a post/pre-display skip&penalty pair around the intertext,
> then creates a \vbox for use a paragraph. The result is (almost) as if
> it the text was part of the 'normal' text flow between two displays.
>
> I cannot tell you if this would work exactly the same as expected in
> ConTeXt (needs further testing), but a context-like solution would
> look like this:
>
> \def\startintertext#1\stopintertext{%
> \noalign{\dointertext{#1}}\NR}
>
> \unexpanded\def\dointertext#1%
> {\penalty\postdisplaypenalty
> \afterdisplayspace % the matching \before... is not needed
> \vbox{\forgetall \noindent #1\par}%
> \penalty\postdisplaypenalty }
>
This does not look good. Consider,
\def\startintertext#1\stopintertext{%
\noalign{\dointertext{#1}}\NR}
\unexpanded\def\dointertext#1%
{\penalty\postdisplaypenalty
\afterdisplayspace % the matching \before... is not needed
\vbox{\forgetall \noindent #1\par}%
\penalty\postdisplaypenalty }
\startformula \startalign
\NC A_1 \NC= \left| \int_0^1 (x^2 - 3x)\, dx \right|
+ \left| \int_1^2 (x^2 -5x + 6)\, dx \right| \NR
\startintertext
Take limits of both integrals
\stopintertext
\NC \NC = \left| \frac{x^3}{3} - \frac{3}{2} x^2 \right|_0^1
+ \left| \frac {x ^3}{3} - 7 \frac{5}{2} x^2 + 6x \right|_1^2 \NR
\NC \NC = \left| - \frac{7}{6} \right| + \left|\frac{14}{3} -
\frac{23}{6}\right| = \frac{7}{6} + \frac{5}{6} = 2 \NR
\stopalign \stopformula
There is too much space after the intertext and the next line. Can you
provide some magic to reduce this space.
Thanks,
Aditya
--
Aditya Mahajan, EECS Systems, University of Michigan
http://www.eecs.umich.edu/~adityam || Ph: 7342624008
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: intertext for aligned equations
2006-03-29 6:42 ` Aditya Mahajan
@ 2006-03-29 7:49 ` Taco Hoekwater
2006-03-29 15:46 ` Aditya Mahajan
0 siblings, 1 reply; 9+ messages in thread
From: Taco Hoekwater @ 2006-03-29 7:49 UTC (permalink / raw)
Aditya Mahajan wrote:
>
> This does not look good. Consider,
>
> There is too much space after the intertext and the next line. Can you
> provide some magic to reduce this space.
Ok, got it. The \NR has to go away, and the \beforedisplayspace
reinserted, like so:
\def\startintertext#1\stopintertext
{\noalign{\dointertext{#1}}}
\unexpanded\def\dointertext#1%
{\penalty\postdisplaypenalty
\afterdisplayspace
\vbox{\forgetall \noindent #1\par}%
\penalty\predisplaypenalty
\beforedisplayspace }
Looks much better (over here).
Taco
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: intertext for aligned equations
2006-03-29 7:49 ` Taco Hoekwater
@ 2006-03-29 15:46 ` Aditya Mahajan
0 siblings, 0 replies; 9+ messages in thread
From: Aditya Mahajan @ 2006-03-29 15:46 UTC (permalink / raw)
<--- On Mar 29, Taco Hoekwater wrote --->
> Aditya Mahajan wrote:
>>
>> This does not look good. Consider,
>>
>> There is too much space after the intertext and the next line. Can you
>> provide some magic to reduce this space.
>
> Ok, got it. The \NR has to go away, and the \beforedisplayspace
> reinserted, like so:
>
> \def\startintertext#1\stopintertext
> {\noalign{\dointertext{#1}}}
>
> \unexpanded\def\dointertext#1%
> {\penalty\postdisplaypenalty
> \afterdisplayspace
> \vbox{\forgetall \noindent #1\par}%
> \penalty\predisplaypenalty
> \beforedisplayspace }
>
> Looks much better (over here).
Thanks a lot. This indeed looks pretty good.
Aditya
--
Aditya Mahajan, EECS Systems, University of Michigan
http://www.eecs.umich.edu/~adityam || Ph: 7342624008
^ permalink raw reply [flat|nested] 9+ messages in thread
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2006-03-27 7:23 intertext for aligned equations Aditya Mahajan
2006-03-27 9:02 ` Taco Hoekwater
2006-03-27 12:27 ` Hans Hagen
2006-03-27 13:53 ` Taco Hoekwater
2006-03-27 14:47 ` Aditya Mahajan
2006-03-27 12:50 ` Hans Hagen
2006-03-29 6:42 ` Aditya Mahajan
2006-03-29 7:49 ` Taco Hoekwater
2006-03-29 15:46 ` Aditya Mahajan
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