Double integral and subscripts

Double integral and subscripts

[Shen Chen]

Hi all,

I want to typeset double integral with subscript beneath the integral
symbol. 

I found \unic@dblint for double integral, and used the usual \limits in
plain tex:
\unic@dblint\limits_{\startsubstack x \ge 0,\NR 0 \le y \le T\stopsubstack}

The subscript did go below the integral, but the two integral symbols are
separate from each other. Any tips? Thanks a lot!

Shenchen

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Re: Double integral and subscripts

[Taco Hoekwater]

Shen Chen wrote:
> Hi all,
> 
> I want to typeset double integral with subscript beneath the integral
> symbol. 
> 
> I found \unic@dblint for double integral, and used the usual \limits in
> plain tex:
> \unic@dblint\limits_{\startsubstack x \ge 0,\NR 0 \le y \le T\stopsubstack}


> The subscript did go below the integral, but the two integral symbols are
> separate from each other. Any tips? Thanks a lot!

$$
\mathop{\unic@dblint}\limits_
     {\startsubstack x \ge 0,\NR 0 \le y \le \stopsubstack}
$$

(it should be possible to do this more elegant, though)
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Re: Double integral and subscripts

[Aditya Mahajan]

On Sun, 5 Aug 2007, Taco Hoekwater wrote:

> Shen Chen wrote:
>> Hi all,
>>
>> I want to typeset double integral with subscript beneath the integral
>> symbol.
>>
>> I found \unic@dblint for double integral, and used the usual \limits in
>> plain tex:
>> \unic@dblint\limits_{\startsubstack x \ge 0,\NR 0 \le y \le T\stopsubstack}
>
>
>> The subscript did go below the integral, but the two integral symbols are
>> separate from each other. Any tips? Thanks a lot!
>
> $$
> \mathop{\unic@dblint}\limits_
>     {\startsubstack x \ge 0,\NR 0 \le y \le \stopsubstack}
> $$
>
> (it should be possible to do this more elegant, though)

\iint\limits should work correctly. It is based on the same macro in 
amsmath.

If you always need \limits, I can provide an option for \displaylimits 
or \nolimits after int, iint, and iiint.

I did not know about unic@dblint, and it looks horrible 
(\int\!\!\!\int). This should be replaced by \iint and triint should 
be replaced by iiint.

Aditya
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Re: Double integral and subscripts

[Shen Chen]

I am using "ConTeXt ver: 2007.01.12", and \iint is not defined even when
newmat is imported. Taco's tip worked.

As I tried on live.contextgarden.net, which is running the latest ConTeXt,
\iint\limits_{...} works as intended.

Thank you.


On 8/5/07 10:10 PM, "Aditya Mahajan" <adityam@umich.edu> wrote:

> On Sun, 5 Aug 2007, Taco Hoekwater wrote:
> 
>> Shen Chen wrote:
>>> Hi all,
>>> 
>>> I want to typeset double integral with subscript beneath the integral
>>> symbol.
>>> 
>>> I found \unic@dblint for double integral, and used the usual \limits in
>>> plain tex:
>>> \unic@dblint\limits_{\startsubstack x \ge 0,\NR 0 \le y \le T\stopsubstack}
>> 
>> 
>>> The subscript did go below the integral, but the two integral symbols are
>>> separate from each other. Any tips? Thanks a lot!
>> 
>> $$
>> \mathop{\unic@dblint}\limits_
>>     {\startsubstack x \ge 0,\NR 0 \le y \le \stopsubstack}
>> $$
>> 
>> (it should be possible to do this more elegant, though)
> 
> \iint\limits should work correctly. It is based on the same macro in
> amsmath.
> 
> If you always need \limits, I can provide an option for \displaylimits
> or \nolimits after int, iint, and iiint.
> 
> I did not know about unic@dblint, and it looks horrible
> (\int\!\!\!\int). This should be replaced by \iint and triint should
> be replaced by iiint.
> 
> Aditya
> ______________________________________________________________________________
> _____
> 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  : https://foundry.supelec.fr/projects/contextrev/
> wiki     : http://contextgarden.net
> ______________________________________________________________________________
> _____

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Re: Double integral and subscripts

[Aditya Mahajan]

Quoting Shen Chen <ShenChen@nus.edu.sg>:

> I am using "ConTeXt ver: 2007.01.12", and \iint is not defined even when
> newmat is imported. Taco's tip worked.

They were added pretty recently. You can either update your context, or 
if you do not want to do that, add the following in your environment 
file (copied from math-tex.tex).

%D More integrals (AM):

\def\dointkern{\mkern-6mu\mathchoice{\mkern-3mu}{}{}{}}

\definemathcommand [iint]   {\repeatintegral\plusone  }
\definemathcommand [iiint]  {\repeatintegral\plustwo  }
\definemathcommand [iiiint] {\repeatintegral\plusthree}

\def\repeatintegral#1%
  {\scratchtoks\emptytoks
   \let\dointlimits\nolimits
   \dorecurse{#1}{\appendtoks \intop \dointkern \to \scratchtoks}
   \appendtoks \intop \dointlimits \to \scratchtoks
   \edef\dodorepeatintegral{\the\scratchtoks}%
   \futurelet\next\dorepeatintegral}

%D If the \type{\limits} option is used after \type{\iint}, use
%D \type{\mathop} and fudge the left hand space a bit to make the
%D subscript visually centered.

\def\dorepeatintegral
   {\ifx\next\limits        \dointlimitcorrection \else
    \ifx\next\displaylimits \dointlimitcorrection \fi\fi
    \dodorepeatintegral}

\def\dointlimitcorrection
  {\mkern-7mu\mathchoice{\mkern-2mu}{}{}{}%
   \mathop\bgroup
     \mkern7mu\mathchoice{\mkern2mu}{}{}{}%
     \let\dointlimits\egroup}


Aditya
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