Re: How to get \iint?

[Vladimir Lomov <lomov.vl@gmail.com>]

Hi.

2010/11/24 Aditya Mahajan <adityam@umich.edu>:
> On Wed, 24 Nov 2010, Vladimir Lomov wrote:
>
>> Hi.
>>
>> The command \iint is defined in context (mkiv) but it doesn't produce
>> the desired sign. What I should do to make it appear? (in log file I see
>> that LMMath font desn't contain such symbol but I don't know much about
>> font mechanism of context, btw in latex I could easily get that symbol
>> so I think it should be in 'standard' math font).
>
> No, the symbol is not in the 'standard' math fonts, and this is trouble.
> Like LaTeX, we also fake the glyph in MkII. In MkIV, we check if the font
> contains that glyph; if not we fake it. Currently, that test is failing.
>
> A temporary workaround (for LM) is to redefine:
>
> \def\repeatintegral#1#2#3%
>  {\let\dointlimits\donothing
>   \let\dodointlimits\intlimits
>   %\iffontchar\textfont\zerocount#1\relax
>   % %\edef\dodorepeatintegral{\utfchar{#1}}%
>   %  \let\dodorepeatintegral#2%
>   %\else
>      \fakerepeatintegral{#3}%
>   %\fi
>   \futurelet\next\dorepeatintegral}
>
> and then \iint \iiint etc will work.
Thank you for advice (I had to regenerate format to see the result,
because I changed the definition in 'math-int.mkiv') but the result is
terrible for inline math and normal for displaystyle.

Moreover I found that this solution would give unexpected result if one use
\setupmathematics[integral=displaylimits], consider the following example:
<example name="ex7_1.tex">
\setupmathematics[integral=displaylimits]
\starttext

Ordinary integral: $\int_{a}^{b}f(x)\text{d}x=F(b)-F(a)$.

Ordinary integral: $\int\limits_{a}^{b}f(x)\text{d}x=F(b)-F(a)$.

\startformula
  \int_{a}^{b}f(x)\text{d}x=F(b)-F(a).
\stopformula

Double integral:
$\iint_{D} f(x,y) dx dy$

Double integral sign (faked symbol) could cause incorrect result:
\startformula
  \iint_{D} f(x,y) \text{d}x \text{d} y
\stopformula

\stoptext
</example>
(I didn't remember where exactly I found command \setupmathematics.)

> Hans, do you know what the \textfont check is not working for LM?

> The ideal solution is to add esint glyphs to the LM math  virtual font. I
> did not work on this because I was assuming that opentype LM math will be
> out soon. But it seems that right now, the only decent opentype math font is
> Cambria. Both Stix and Asansa give really horrible spacing at times.
IMHO, Cambria looks very odd. I prefer to use CM fonts, the design for
different font families (serif, sans, monospace) is more balanced than
any other font families have.


---
WBR, Vladimir Lomov
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