[NTG-context] Placing number in \sqrt
Hans Hagen
j.hagen at xs4all.nl
Mon May 4 09:31:08 CEST 2020
On 5/4/2020 8:47 AM, context at vivaldi.net wrote:
> Hello,
>
> compare placing "3" in the following examples:
>
> ----
> \starttext
> $\sqrt[3]{5}$ % (1)
> \par
> $\sqrt[3~]{5}$ % (2)
> \stoptext
> ----
>
> In the first case, the "3" is placed naturally by ConTeXt and placed
> more in the centre of "V" part of the square sign.
>
> In the second example, the "3" is shifted manually by adding "~" and the
> final placement seems to me a bit better.
>
> What is your opinion - is the case (1) OK/intended and user should avoid
> any manual shifting?
>
> Or manual shifting is OK? Or is there a way to affect this placement
> globally in ConTeXt, e.g. setting an internal variable?
The placement is driven by the font so kind of part of the design. There
is a whole bunch of parameters that drives placement and there is one
that deals with the spacing after the degree. Here are some examples.
\starttext
\def\R {\Umathradicaldegreeafter\textstyle0pt}
\def\RR{\Umathradicaldegreeafter\textstyle\dimexpr
\Umathradicaldegreeafter\textstyle+.1em\relax}
\def\RRR{\frozen\Umathradicaldegreeafter\textstyle\dimexpr
\Umathradicaldegreeafter\textstyle+.2em\relax}
$ \sqrt[3]{5} \RR\sqrt[3]{5} \sqrt[3]{5} $\par
$ \sqrt[3]{5} {\RRR\sqrt[3]{5}} \sqrt[3]{5} $\par
$ \RR\sqrt[3]{5} {\RRR\sqrt[3]{5}} \sqrt[3]{5} $\par
{\R $\sqrt[3]{5} \sqrt[3]{5} \sqrt[3]{5} $\par
{\RR $\sqrt[3]{5} \sqrt[3]{5} \sqrt[3]{5} $\par
{\RRR$\sqrt[3]{5} \sqrt[3]{5} \sqrt[3]{5} $\par
\stoptext
Changing these parameters inside math is kind of pseudo global: the
value at the end of the first pass is used for the whole formula.
However, in lmtx you can cheat by using the \frozen prefix to make it
behave local.
If we can come up with a proper name for a parameter we can make it a
setting. One of these things that Aditya and I will to discuss when we
have time and are in math mood. (There is much more in math we could
control if needed, but often in the end that control is not that much
needed at all.)
Hans
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Hans Hagen | PRAGMA ADE
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