Re: [NTG-context] Position of prime for derivatives

25 May 2017

      On Tue, May 23, 2017 at 5:02 PM, Mikael P. Sundqvist  wrote:
...
On Tue, May 23, 2017 at 11:58 AM, Mathias Schickel
 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 :
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  wrote:
On Sun, May 21, 2017 at 10:29 PM, Otared Kavian  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  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}
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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
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___________________________________________________________________________________
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to
the Wiki!
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archive  : https://bitbucket.org/phg/context-mirror/commits/
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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
In

current version: 2017.05.25 12:50

all problems I've noticed with primes seem to be gone! Now we can even
write $u''_p$ or $u_p''$.

Hans, your work and quick fix of this problem is very much appreciated!

Best regards, Mikael