Bug in math: version

Bug in math: version

[Otared Kavian]

Hi Hans, 

With the latest beta there seems a bug has been intoduced with « \| » which should give a vertical double bar and not a simple bar.

This is a minimal example:

\starttext
With 2019.02.10 17:43, the command \type{\|x\|} gives an incorrect result:

$\|x\| = 1$

$|x| = 1$
\stoptext

Best regards: OK
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Re: Bug in math: version

[Alan Braslau]

Not just the latest beta ... and indeed according to the TeXbook this should be a vertical double bar (\Vert), in math mode.

I wish to point out that | in text font (text mode) is different from | in math font (math mode). I noticed that Preview (on the mac) *fails* to render the math font $|$ whereas \| in text mode does get rendered in Preview or printed from Preview (my document used dejavu fonts). Other pdf renderers on the mac (acroread, mupdf, evince, ...) are OK. This is clearly a bug in Preview.

How, other then \|, should one produce | in *text* mode?

Alan




On Wed, 13 Feb 2019 18:52:26 +0100
Otared Kavian <otared@gmail.com> wrote:

> Hi Hans, 
> 
> With the latest beta there seems a bug has been intoduced with « \| » which should give a vertical double bar and not a simple bar.
> 
> This is a minimal example:
> 
> \starttext
> With 2019.02.10 17:43, the command \type{\|x\|} gives an incorrect result:
> 
> $\|x\| = 1$
> 
> $|x| = 1$
> \stoptext
> 
> Best regards: OK
> ___________________________________________________________________________________
> 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/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________

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Re: Bug in math: version

[Hans Hagen]

On 2/13/2019 7:12 PM, Alan Braslau wrote:
> Not just the latest beta ... and indeed according to the TeXbook this should be a vertical double bar (\Vert), in math mode.
> 
> I wish to point out that | in text font (text mode) is different from | in math font (math mode). I noticed that Preview (on the mac) *fails* to render the math font $|$ whereas \| in text mode does get rendered in Preview or printed from Preview (my document used dejavu fonts). Other pdf renderers on the mac (acroread, mupdf, evince, ...) are OK. This is clearly a bug in Preview.
> 
> How, other then \|, should one produce | in *text* mode?
does \textbar work?

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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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Re: Bug in math: version

[Hans Hagen]

On 2/13/2019 6:52 PM, Otared Kavian wrote:
> Hi Hans,
> 
> With the latest beta there seems a bug has been intoduced with « \| » which should give a vertical double bar and not a simple bar.

hm, has always been so, \* being an escape

> This is a minimal example:
> 
> \starttext
> With 2019.02.10 17:43, the command \type{\|x\|} gives an incorrect result:
> 
> $\|x\| = 1$

why not use $||x|| = 1$

> 
> $|x| = 1$
> \stoptext
> 
> Best regards: OK
> ___________________________________________________________________________________
> 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
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> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________
> 


-- 

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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Re: Bug in math: version

[Hans Åberg]

> On 14 Feb 2019, at 13:05, Hans Hagen <j.hagen@xs4all.nl> wrote:
> 
>> With 2019.02.10 17:43, the command \type{\|x\|} gives an incorrect result:
>> $\|x\| = 1$
> 
> why not use $||x|| = 1$

Also $‖x‖ = 1$.

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Re: Bug in math: version

[Alan Braslau]

On Thu, 14 Feb 2019 13:02:21 +0100
Hans Hagen <j.hagen@xs4all.nl> wrote:

> On 2/13/2019 7:12 PM, Alan Braslau wrote:
> > Not just the latest beta ... and indeed according to the TeXbook this should be a vertical double bar (\Vert), in math mode.
> > 
> > I wish to point out that | in text font (text mode) is different from | in math font (math mode). I noticed that Preview (on the mac) *fails* to render the math font $|$ whereas \| in text mode does get rendered in Preview or printed from Preview (my document used dejavu fonts). Other pdf renderers on the mac (acroread, mupdf, evince, ...) are OK. This is clearly a bug in Preview.
> > 
> > How, other then \|, should one produce | in *text* mode?  
> does \textbar work?

Now, this is really interesting

\starttext
\textbar x\textbar
\stoptext

produces |x| as seen by acroread, mupdf, evince, ... on the Mac
BUT shows | | with preview and with skim (which uses the Apple pdf rendering engine).

Thus, the Apple *bug* is perverse. (Would another Mac user confirm this.)


Using \textbar is fine as a fallback, but much less convenient (and readable) than a shorthand.
Two questions:

1) $\|$ SHOULD produce ‖ according to the TeXbook, so we cannot dispute Knuth's choice.
   \| may be undefined in the bible for textmode,
   but logic would have it also yield ‖ in a text font.

2) I guess | is active in text mode (and used as a delimiter in column specifications,
   for example, i.e. \starttabulate [|l|l|]). I have always felt a bit uncomfortable
   with this, having in a far past come from LaTeX practice where it defined a vertical line.

Our solution in ConTeXt is to use UTF-8 input, so ‖ for a double vertical bar.
Therefore, | SHOULD produce a single vertical bar, thus it should not be active.
Is this possible?
(Also, as a bonus, || should be taken as a ligature.)

Alan
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Re: Bug in math: version

[Alan Braslau]

On Thu, 14 Feb 2019 08:42:15 -0700
Alan Braslau <braslau.list@comcast.net> wrote:

> On Thu, 14 Feb 2019 13:02:21 +0100
> Hans Hagen <j.hagen@xs4all.nl> wrote:
> 
> > On 2/13/2019 7:12 PM, Alan Braslau wrote:
> > > Not just the latest beta ... and indeed according to the TeXbook this should be a vertical double bar (\Vert), in math mode.
> > > 
> > > I wish to point out that | in text font (text mode) is different from | in math font (math mode). I noticed that Preview (on the mac) *fails* to render the math font $|$ whereas \| in text mode does get rendered in Preview or printed from Preview (my document used dejavu fonts). Other pdf renderers on the mac (acroread, mupdf, evince, ...) are OK. This is clearly a bug in Preview.
> > > 
> > > How, other then \|, should one produce | in *text* mode?  
> > does \textbar work?

$\vert$ and $\Vert$ should also be defined. How about in text mode?

Alan
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Re: Bug in math: version

[Hans Åberg]

> On 14 Feb 2019, at 16:42, Alan Braslau <braslau.list@comcast.net> wrote:
> 
> Now, this is really interesting
> 
> \starttext
> \textbar x\textbar
> \stoptext
> 
> produces |x| as seen by acroread, mupdf, evince, ... on the Mac
> BUT shows | | with preview and with skim (which uses the Apple pdf rendering engine).

On MacOS 10.13.6, using ConTeXt 1.02 of TeXLive 2018 updated using the TeXLive Utility, $|x|$, $\textbar x\textbar$, $\|x\|$, $‖x‖$, $||x||$ gives the output |𝑥|, |𝑥|, |𝑥|, ‖𝑥‖, ‖𝑥‖, copied from the PDF in Preview.

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Re: Bug in math: version

[Alan Braslau]

On Thu, 14 Feb 2019 18:08:09 +0100
Hans Åberg <haberg-1@telia.com> wrote:

> > On 14 Feb 2019, at 16:42, Alan Braslau <braslau.list@comcast.net> wrote:
> > 
> > Now, this is really interesting
> > 
> > \starttext
> > \textbar x\textbar
> > \stoptext
> > 
> > produces |x| as seen by acroread, mupdf, evince, ... on the Mac
> > BUT shows | | with preview and with skim (which uses the Apple pdf rendering engine).  
> 
> On MacOS 10.13.6, using ConTeXt 1.02 of TeXLive 2018 updated using the TeXLive Utility, $|x|$, $\textbar x\textbar$, $\|x\|$, $‖x‖$, $||x||$ gives the output |𝑥|, |𝑥|, |𝑥|, ‖𝑥‖, ‖𝑥‖, copied from the PDF in Preview.

So it must be a bug with macOS Mojave 10.14.3

This is not surprising, as I have seen lots of other rendering bugs come and go with the Apple library.

Alan
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