Re: Position of prime for derivatives

["Mikael P. Sundqvist" <mickep@gmail.com>]

On Tue, May 23, 2017 at 11:58 AM, Mathias Schickel
<msch@fa.uni-tuebingen.de> wrote:
> Hi Mikael and Otared,
>
> I can confirm issues regarding primes, too. If you are using the STIX 2
> fonts (http://www.stixfonts.org) and my example below you get a somewhat
> strange behaviour of primes that is pretty obvious. I think the issues
> should be fixed.
>
> By the way the issue seems to depend to some extend on the fonts. Using
> Lucida by \setupbodyfont[lucidaot] it is not that obvious but still present.
> Using Latin Modern it seems that the spacing between the primes changes
> between f'' and f^{''}. Cambria seems to show that behaviour (like Latin
> Modern), too, but less obvious.
>
> Best regards
> Mathias
>
> %% example
> \unprotect
>
> \definefontfeature
> [stixtwo-math-feature]
> [kern=yes,
> ss01=no,    % calligraphic letters
> ss02=yes, % lowercase italic variants (e.g. open g)
> ss03=no, % hbar und lambdabar variants
> ss04=yes, % larger and lower primes, minute etc.
> ss05=no, % shorter arrows
> ss06=no, % narrower and shorter element and similar symbols
> ss07=no, % some smaller operators and emptyset variant
> ss08=yes, % upright integrals etc.
> ss09=no, % variant negated symbols
> ss10=yes, % variants of greater and lesser and similar symbols
> ss11=yes, % variant of negated set (inclusion etc.) symbols
> ss14=yes, %
> ss16=yes] % variants of circled operators
>
> \starttypescriptcollection[Stix2]
> \starttypescript [\s!serif] [Stix2] [\s!all]
> \definefontsynonym
>             [Stix2Regular]
>             [file:STIX2Text-Regular.otf]
>         \definefontsynonym
>             [Stix2Bold]
>             [file:STIX2Text-Bold.otf]
>         \definefontsynonym
>             [Stix2Italic]
>             [file:STIX2Text-Italic.otf]
>         \definefontsynonym
>             [Stix2BoldItalic]
>             [file:STIX2Text-BoldItalic.otf]
>         \definefontsynonym[\s!Serif] [Stix2Regular] [\s!features=\s!default]
>         \definefontsynonym[\s!SerifBold] [Stix2Bold]
> [\s!features=\s!default]
>         \definefontsynonym[\s!SerifItalic] [Stix2Italic]
> [\s!features=\s!default]
>         \definefontsynonym[\s!SerifBoldItalic] [Stix2BoldItalic]
> [\s!features=\s!default]
>     \stoptypescript
>
>     \starttypescript [\s!math] [Stix2]
>         \definefontsynonym
>             [Stix2Math]
>             [file:STIX2Math.otf]
>             [features=math\mathsizesuffix]
>         \definefontsynonym [\s!MathRoman] [Stix2Math]
> [\s!features={\s!math\mathsizesuffix,mathextra,stixtwo-math-feature},\s!designsize=\s!auto]
>     \stoptypescript
>
>     \starttypescript [Stix2]
>         \definetypeface [\typescriptone] [\s!rm] [\s!serif] [Stix2]
> [\s!default]
>         \definetypeface [\typescriptone] [\s!mm] [\s!math] [Stix2]
> [\s!default]
>     \stoptypescript
>
> \stoptypescriptcollection
>
> \protect
>
> \setupbodyfont[Stix2]
>
> \starttext
> %
> Compare $f'$ to $(f')$ and to $f''$, $(f'')$, $f^{''}$ and $(f^{''})$.
> %
> \stoptext
> %% end of example
>
>
>
> Am 22.05.2017 um 09:50 schrieb Otared Kavian <otared@gmail.com>:
>
> Hi Mikael,
>
> You are correct, the position of \prime depends on whether there is a next
> character or not after it, and it seems that this has an effect on its
> position for characters having a subscript as in
> $f_{1}''(x) \neq f''_{1}(x)$
> $f'f''f'’'$
> Best regards: OK
>
> On 22 May 2017, at 08:51, Mikael P. Sundqvist <mickep@gmail.com> wrote:
>
> On Sun, May 21, 2017 at 10:29 PM, Otared Kavian <otared@gmail.com> wrote:
>
> Hi Mikael,
>
> I agree with what you are reporting: the current behavior of the \prime
> operator is not completely satisfying when using ConTeXt mkiv, while in mkii
> it is the most satisfying (in my opinion…).
>
> The turn around consisting in using $f^{‘’}$ or  $f^{\prime\prime}$, or even
> $f^{{}^{\prime\prime}}$, is not really satisfying either.
>
> But I think (or I hope that) at some point Hans will fix it in mkiv.
>
> Best regards: OK
>
> On 21 May 2017, at 08:14, Mikael P. Sundqvist <mickep@gmail.com> wrote:
> […]
>
> And just for reference, the document below gives the attached pdf,
> compiled with lualatex. I think the location of the primes there look
> better. Sorry for spamming about this issue, but I think it is
> important for all people writing math with ConTeXt.
>
> /Mikael
>
> \RequirePackage{luatex85}
> \documentclass[border=2pt]{standalone}
>
> \usepackage{unicode-math}
> \setmainfont{LucidaBrightOT}
> \setmathfont{LucidaBrightMathOT}
>
> \begin{document}
> $f'f''$
> \end{document}
> <lltest.pdf>___________________________________________________________________________________
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>
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>
>
> Otared, thank you for confirmation. I also hope there will be a fix soon.
>
> In the meantime, I put yet another test file. The location of the
> primes depends on the next character (I use, at the moment current
> version: 2017.05.15 21:48)
>
> /Mikael
>
> \definefontfamily[myface][rm][Lucida Bright OT]
> \definefontfamily[myface][mm][Lucida Bright Math OT]
> \setupbodyfont[myface,10pt]
> \starttext
> \startTEXpage[offset=2pt]
> $f'(x)f''(x)f'f''$
> \stopTEXpage
> \stoptext
> <primfisk.pdf>___________________________________________________________________________________
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> the Wiki!
>
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>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
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> ___________________________________________________________________________________
>
>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
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> ___________________________________________________________________________________

Thanks Otared and Mathias!

Hans, just to know, are you working on a fix? Is there anything more
we can provide?

Best regards, Mikael
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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://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
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