selectively turn off captions

selectively turn off captions

[Roger Mason]

Hello,

I'm making progress in using modes - thanks again for the help so far
that was given in the "switching to Context" thread.

I have followed Thomas Schmitz' practex article and have set up modes
for presentation and manuscript.  I am using external figures on most
of the slides.  In presentation mode there is no need for figure
captions (the slide heading and my waffling will suffice).  In
manuscript mode I'd like to have captions to the figures.  I know I
can disable captions with {none} for each individual figure, but can I
do this _just_ for the presentation?  I have looked up \setupcaptions
but there does not seem to be a "none" option that could be used for
this purpose.

Thanks,

Roger
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Re: selectively turn off captions

[Wolfgang Schuster]

2007/11/29, Roger Mason <rmason@esd.mun.ca>:
> Hello,
>
> I'm making progress in using modes - thanks again for the help so far
> that was given in the "switching to Context" thread.
>
> I have followed Thomas Schmitz' practex article and have set up modes
> for presentation and manuscript.  I am using external figures on most
> of the slides.  In presentation mode there is no need for figure
> captions (the slide heading and my waffling will suffice).  In
> manuscript mode I'd like to have captions to the figures.  I know I
> can disable captions with {none} for each individual figure, but can I
> do this _just_ for the presentation?  I have looked up \setupcaptions
> but there does not seem to be a "none" option that could be used for
> this purpose.
>
> Thanks,
>
> Roger

\setupfloat[figure][default=none]

Wolfgang
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Re: selectively turn off captions

[Roger Mason]

Hi Wolfgang,

"Wolfgang Schuster" <schuster.wolfgang@googlemail.com> writes:

> \setupfloat[figure][default=none]

Thanks, but that did not work.  The only thing that seems to work is
to put {none} for the caption.  However, that means I'm not going to
have captions in the manuscript version either.

Cheers,
Roger
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Re: selectively turn off captions

[Hans Hagen]

Roger Mason wrote:
> Hi Wolfgang,
> 
> "Wolfgang Schuster" <schuster.wolfgang@googlemail.com> writes:
> 
>> \setupfloat[figure][default=none]
> 
> Thanks, but that did not work.  The only thing that seems to work is
> to put {none} for the caption.  However, that means I'm not going to
> have captions in the manuscript version either.

well, we can misuse the number= key .....

% patch, goes in cont-new.tex

\unprotect

\def\presetfloatvariables#1#2#3#4%
   {\doifcommonelse
      {#2}
      {\v!left,\v!right,\v!inner,\v!outer,%
       \v!inleft,\v!inright,\v!inmargin,%
       \v!backspace,\v!cutspace,%
       \v!innermargin,\v!outermargin,\v!inneredge,\v!outeredge,%
       \v!leftmargin,\v!leftedge,\v!rightmargin,\v!rightedge}
      {\global\parfloattrue}
      {\global\parfloatfalse}%
    \ifinsidecolumns
      \global\parfloatfalse
    \fi
    \global\sidefloatshift\zeropoint
    \global\sidefloatmaximum\zeropoint
    \global\chardef\sidefloatmethod\floatparameter\c!sidemethod
    \global\chardef\textfloatmethod\floatparameter\c!textmethod
    \global\chardef\sidefloatalign\zerocount
    \globallet\floatrotation\!!zerocount
    \calculatefloatskips
    \ifparfloat
      \processaction
        [\floatparameter\c!sidealign]
        [\v!height=>\global\chardef\sidefloatalign\plusone,%
           \v!line=>\global\chardef\sidefloatalign\plustwo,% (***)
          \v!depth=>\global\chardef\sidefloatalign\plusthree,%
           \v!grid=>\global\chardef\sidefloatalign4,%
       \v!halfline=>\global\chardef\sidefloatalign5]%
% todo (test first): 
\doifinset\v!lokaal{#2}{\chardef\sidefloatalign\zerocount}%
      \ifcase\sidefloatalign\relax % todo: optie v!lokaal => \else
        \doifinset\v!height  {#2}{\global\chardef\sidefloatalign\plusone}%
        \doifinset\v!line    {#2}{\global\chardef\sidefloatalign\plustwo}%
        \doifinset\v!depth   {#2}{\global\chardef\sidefloatalign\plusthree}%
        \doifinset\v!grid    {#2}{\global\chardef\sidefloatalign4}%
        \doifinset\v!halfline{#2}{\global\chardef\sidefloatalign5}% 
meant for 'none'
      \fi
      \doifinset\v!high{#2}{\global\sidefloattopskip   \zeropoint}%
      \doifinset\v!low {#2}{\global\sidefloatbottomskip\zeropoint}%
      \doifinset\v!fit {#2}
        {\global\sidefloattopskip   \zeropoint
         \global\sidefloatbottomskip\zeropoint
         \global\floatsideskip      \zeropoint}%
    \else
      \processallactionsinset
        [#2]
        [ 90=>\globallet\floatrotation\commalistelement,%
         180=>\globallet\floatrotation\commalistelement,%
         270=>\globallet\floatrotation\commalistelement]%
    \fi
    \doifinsetelse\v!nonumber{#2}
      {\global\nofloatnumbertrue}
      {\doifelse{\floatcaptionparameter\c!number}\v!yes
         {\global\nofloatnumberfalse}
         {\global\nofloatnumbertrue}}%
    \ConvertToConstant\doifelse{#4}{}
      {\global\emptyfloatcaptiontrue}
      {\global\emptyfloatcaptionfalse}%
    \doifinsetelse\v!none{#2}
      {\global\nofloatcaptiontrue}
      {\ConvertToConstant\doifelse{#4}\v!none
         {\global\nofloatcaptiontrue}
         {\global\nofloatcaptionfalse}}%
\doif{\floatcaptionparameter\c!number}\v!none
   {\global\nofloatcaptiontrue}%
    \ifemptyfloatcaption \ifnofloatnumber
      \global\nofloatcaptiontrue
    \fi \fi}

\protect

\starttext

\placefigure{}{}

\setupcaptions[number=none]

\placefigure{}{}

\stoptext

(I'll add that to the core, but only if you wikify it)

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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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Re: selectively turn off captions

[Mojca Miklavec]

On Nov 29, 2007 11:17 PM, Hans Hagen wrote:

> (I'll add that to the core, but only if you wikify it)

Nice new strategy :)

Mojca
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Re: selectively turn off captions

[Hans Hagen]

Mojca Miklavec wrote:
> On Nov 29, 2007 11:17 PM, Hans Hagen wrote:
> 
>> (I'll add that to the core, but only if you wikify it)
> 
> Nice new strategy :)

yes, and the next one will be: "but only if you send mojca a redesign 
for the wiki" -)

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               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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Re: selectively turn off captions

[Roger Mason]

Hello Hans,

Hans Hagen <pragma@wxs.nl> writes:

> Roger Mason wrote:
> well, we can misuse the number= key .....
>
> % patch, goes in cont-new.tex
>

I'm sorry to trouble you but... 

I applied the patch.  When I try to compile my file it fails like
this:

! Undefined control sequence.
\presetfloatvariables ...atmethod \floatparameter 
                                                  \c!sidemethod \global \cha...

\docompletefloat ...loatvariables {#1}{#4}{#2}{#6}
                                                  \bgroup \setnaturalfloatdi...
<argument> ...tion of sapphire deposits.}\nextbox 
                                                  \else \docompletefloat {fi...

\secondoftwoarguments #1#2->#2
                              
\xdocompletefloat ...at ,#4}{#5}{#6}\nextbox \fi }
                                                  \else \docompletefloat {#1...

\dodowithnextbox ...ibution of sapphire deposits.}
                                                  \doifnotinset \v!text {sap...
l.114 ...re[Sapphire_world_map][width=\textwidth]}

The offending lines from my file:

  \placefigure
    [sapphiremap][Sapphire_world_map]
    {Distribution of sapphire deposits.}
    {\externalfigure[Sapphire_world_map][width=\textwidth]} % line 114

Am I calling \placefigure wrongly?

Thanks very much for your help.

Roger
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Re: selectively turn off captions

[Hans Hagen]

Roger Mason wrote:
> Hello Hans,
> 
> Hans Hagen <pragma@wxs.nl> writes:
> 
>> Roger Mason wrote:
>> well, we can misuse the number= key .....
>>
>> % patch, goes in cont-new.tex
>>
> 
> I'm sorry to trouble you but... 
> 
> I applied the patch.  When I try to compile my file it fails like
> this:
> 
> ! Undefined control sequence.
> \presetfloatvariables ...atmethod \floatparameter 

then you run an old context and have to wait till the next current 
(soon, when the luatex beta is out)

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Re: selectively turn off captions

[Roger Mason]

Hans Hagen <pragma@wxs.nl> writes:

> then you run an old context and have to wait till the next current 
> (soon, when the luatex beta is out)

is it not possible to update to the current context?  I'm running
3.0_p1 (on a Gentoo linux box so I'm acustomed to compiling from
source).

Thanks,
Roger
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Re: selectively turn off captions

[Hans Hagen]

Roger Mason wrote:
> Hans Hagen <pragma@wxs.nl> writes:
> 
>> then you run an old context and have to wait till the next current 
>> (soon, when the luatex beta is out)
> 
> is it not possible to update to the current context?  I'm running
> 3.0_p1 (on a Gentoo linux box so I'm acustomed to compiling from
> source).

you can try the current beta

Hans

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                                              | www.pragma-pod.nl
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Re: selectively turn off captions

[Roger Mason]

Hello all,

Hans Hagen <pragma@wxs.nl> writes:

> you can try the current beta

It did not work with my updated version:

texexec --version
TeXExec | version 6.2.0 - 1997-2006 - PRAGMA ADE/POD

ctxtools --contexttools
CtxTools | version 1.3.3 - 2004/2006 - PRAGMA ADE/POD

figures         : dimensions of Sapphire_world_map are determined
externally
(./main.ctx.tuo))
! Incomplete \iffalse; all text was ignored after line 161.
<inserted text> 
                \fi
<*> main.ctx.tex 
                 emergencyend
? 

Is this version still too old?

Thanks,
Roger
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Re: selectively turn off captions

[Hans Hagen]

Roger Mason wrote:
> Hello all,
> 
> Hans Hagen <pragma@wxs.nl> writes:
> 
>> you can try the current beta
> 
> It did not work with my updated version:
> 
> texexec --version
> TeXExec | version 6.2.0 - 1997-2006 - PRAGMA ADE/POD
> 
> ctxtools --contexttools
> CtxTools | version 1.3.3 - 2004/2006 - PRAGMA ADE/POD
> 
> figures         : dimensions of Sapphire_world_map are determined
> externally
> (./main.ctx.tuo))

where does that name come from ... ctx is reserved for context job 
control files

Hans

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Re: selectively turn off captions

[Roger Mason]

Hans Hagen <pragma@wxs.nl> writes:

>> (./main.ctx.tuo))
>
> where does that name come from ... ctx is reserved for context job 
> control files

The file name being compiled is main.ctx.tex.  I'm using the dual
extension .ctx.tex as a way of telling my editor (emacs) to invoke the
context mode of AUCTeX when I load a file with that extension.

Roger
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Re: selectively turn off captions

[Jean Magnan de Bornier]

Le 01 décembre à 14:15:24 Roger Mason <rmason@esd.mun.ca> écrit notamment:

| The file name being compiled is main.ctx.tex.  I'm using the dual
| extension .ctx.tex as a way of telling my editor (emacs) to invoke the
| context mode of AUCTeX when I load a file with that extension.

Well, AucTeX does recognize a LaTeX file from a ConTeXt file; no need for that!
-- 
Jean
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Re: selectively turn off captions

[Peter Münster]

On Sat, Dec 01, 2007 at 03:05:33PM +0100, Jean Magnan de Bornier wrote:
> Le 01 décembre à 14:15:24 Roger Mason <rmason@esd.mun.ca> écrit notamment:
> 
> | The file name being compiled is main.ctx.tex.  I'm using the dual
> | extension .ctx.tex as a way of telling my editor (emacs) to invoke the
> | context mode of AUCTeX when I load a file with that extension.
> 
> Well, AucTeX does recognize a LaTeX file from a ConTeXt file; no need for that!

It seems to me, only if there is a "\starttext" in the file.

For files without "\starttext" you can put these lines at the end:

%%% Local Variables: 
%%% mode: context
%%% End: 

I don't need that no more, since I use
'(TeX-default-mode (quote context-mode))

Cheers, Peter

-- 
http://pmrb.free.fr/contact/
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Re: selectively turn off captions

[Roger Mason]

Hello Jean & Peter,

Jean Magnan de Bornier <jm.bornier@free.fr> writes:

> Well, AucTeX does recognize a LaTeX file from a ConTeXt file; no need for that!

I did it like that because I have (setq-default TeX-master nil) in my
.emacs so it asks then inserts the local variables that Peter
mentioned.  Having emacs recognise a context file by \starttext is
fine except when you open a new file.

This is drifting off topic but, if you have any tweaks to make AUCTeX
work better with context than it does out of the box then I'd be glad
to hear about them.

Roger
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Re: Opening ConTeXt files in emacs [was : selectively turn off captions]

[Jean Magnan de Bornier]

Le 01 décembre à 20:00:59 Roger Mason <rmason@esd.mun.ca> écrit notamment:

| Hello Jean & Peter,
>
| Jean Magnan de Bornier <jm.bornier@free.fr> writes:
>
| > Well, AucTeX does recognize a LaTeX file from a ConTeXt file; no need for that!
>
| I did it like that because I have (setq-default TeX-master nil) in my
| .emacs so it asks then inserts the local variables that Peter
| mentioned.  Having emacs recognise a context file by \starttext is
| fine except when you open a new file.
>
| This is drifting off topic but, if you have any tweaks to make AUCTeX
| work better with context than it does out of the box then I'd be glad
| to hear about them.
>

Well, not specific to AucTeX, you could use one of emacs' template modes
to create new tex files, specifying the needed lines in the template.

http://www.emacswiki.org/cgi-bin/emacs-en/TemplatesMode

(I use template.el to choose e.g. from several styles to write letters,
and I like it).

On the other hand, AucTeX maintainers might be willing to develop something
specific for opening context files...

cheers,
-- 
Jean
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Re: selectively turn off captions

[Sanjoy Mahajan]

> I'm using the dual extension .ctx.tex as a way of telling my editor
> (emacs) to invoke the context mode of AUCTeX when I load a file with
> that extension.

Auctex automatically recognizes plain tex vs latex vs context files by
the first few lines in the file.  

The main time when that method does not work is when starting a new
file.  Since almost every tex file I make these days is a ConTeXt
file, I set the default for that case by using this .emacs line:

(setq TeX-default-mode 'context-mode)

-Sanjoy

`Not all who wander are lost' (J.R.R. Tolkien)
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Re: selectively turn off captions

[Thomas A. Schmitz]

On Nov 30, 2007, at 2:11 PM, Roger Mason wrote:

> is it not possible to update to the current context?  I'm running
> 3.0_p1 (on a Gentoo linux box so I'm acustomed to compiling from
> source).
>
Gentoo version numbers are not something that many people around here  
will know. I assume that 3.0_p1 refers to gentoo's tetex ebuild. This  
is ancient, tetex has been unmaintained for almost two years (and  
gentoo should be ashamed that they still haven't gotten around to  
making texlive the default). Of course it's possible to upgrade, but  
you will run into trouble: you'll need to compile a newer version of  
pdftex and install that. The gentoo tex setup is quite complex, and  
finding out why it is still using some old config file etc. is a royal  
pain. I tried it for a while and in the end got fed up with it and  
installed texlive from the iso image (see http://wiki.contextgarden.net/TeX-live) 
. But if you want to give it a shot, there's a wiki page about it;  
some info may be slightly updated, but most of it should work as  
described: http://wiki.contextgarden.net/Linux_Installation#Updating_Gentoo_Linux

Thomas
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Re: selectively turn off captions

[Roger Mason]

Hi Thomas,

"Thomas A. Schmitz" <thomas.schmitz@uni-bonn.de> writes:

> Gentoo version numbers are not something that many people around here  
> will know. I assume that 3.0_p1 refers to gentoo's tetex ebuild. This  
> is ancient, tetex has been unmaintained for almost two years (and  
> gentoo should be ashamed that they still haven't gotten around to  
> making texlive the default). Of course it's possible to upgrade, but  
> you will run into trouble: you'll need to compile a newer version of  
> pdftex and install that. The gentoo tex setup is quite complex, and  
> finding out why it is still using some old config file etc. is a royal  
> pain. I tried it for a while and in the end got fed up with it and  
> installed texlive from the iso image (see http://wiki.contextgarden.net/TeX-live) 
> . But if you want to give it a shot, there's a wiki page about it;  
> some info may be slightly updated, but most of it should work as  
> described: http://wiki.contextgarden.net/Linux_Installation#Updating_Gentoo_Linux
>
This is what I have:

TeXExec 5.2.4 - ConTeXt / PRAGMA ADE 1997-2005

               texexec : TeXExec 5.2.4 - ConTeXt / PRAGMA ADE 1997-2005
               texutil : TeXUtil 9.0.0 - ConTeXt / PRAGMA ADE 1992-2004
                   tex : pdfeTeX, 3.141592-1.30.5-2.2 (Web2C 7.5.5)
               context : ver: 2005.01.31
               cont-en : ver: 2005.01.31  fmt: 2007.11.29  mes: english

I think there is now a texlive ebuild that is marked "testing".  Maybe
I should try that first.  I have a package built for teTeX so i can
revert if disaster strikes.

Cheers,
Roger

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Re: selectively turn off captions

[Idris Samawi Hamid]

On Fri, 30 Nov 2007 08:05:14 -0700, Roger Mason <rmason@esd.mun.ca> wrote:

> TeXExec 5.2.4 - ConTeXt / PRAGMA ADE 1997-2005
>
>                texexec : TeXExec 5.2.4 - ConTeXt / PRAGMA ADE 1997-2005
>                texutil : TeXUtil 9.0.0 - ConTeXt / PRAGMA ADE 1992-2004
>                    tex : pdfeTeX, 3.141592-1.30.5-2.2 (Web2C 7.5.5)
>                context : ver: 2005.01.31
>                cont-en : ver: 2005.01.31  fmt: 2007.11.29  mes: english

The Middle Ages, almost BC in ConTeXt time...

Must update, I'd start with a fresh, clean TeX if I were you.

Best
Idris

-- 
Professor Idris Samawi Hamid, Editor-in-Chief
International Journal of Shi`i Studies
Department of Philosophy
Colorado State University
Fort Collins, CO 80523

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Re: selectively turn off captions

[luigi scarso]

> > TeXExec 5.2.4 - ConTeXt / PRAGMA ADE 1997-2005
> >
> >                texexec : TeXExec 5.2.4 - ConTeXt / PRAGMA ADE 1997-2005
> >                texutil : TeXUtil 9.0.0 - ConTeXt / PRAGMA ADE 1992-2004
> >                    tex : pdfeTeX, 3.141592-1.30.5-2.2 (Web2C 7.5.5)
> >                context : ver: 2005.01.31
> >                cont-en : ver: 2005.01.31  fmt: 2007.11.29  mes: english
>
> The Middle Ages, almost BC in ConTeXt time...
>
> Must update, I'd start with a fresh, clean TeX if I were you.
It depends.
Actually this configuration can produce a good pdf, in the sense
that can be read by Adobe Reader 5.0 and following .
Maybe a complety separete tree (pdftex1.4+ConTeXt) can be a solution.

-- 
luigi
...
it's new .
it's powerful .
it's luatex .
http://www.luatex.org
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Re: selectively turn off captions

[Roger Mason]

"Idris Samawi Hamid" <ishamid@colostate.edu> writes:


> The Middle Ages, almost BC in ConTeXt time...
>
> Must update, I'd start with a fresh, clean TeX if I were you.
>
 I think I just made it to the renaissance:

TeXExec | version 6.2.0 - 1997-2006 - PRAGMA ADE/POD

Cheers,
Roger
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Re: selectively turn off captions

[Wolfgang Schuster]

2007/11/29, Hans Hagen <pragma@wxs.nl>:
> Roger Mason wrote:
> > Hi Wolfgang,
> >
> > "Wolfgang Schuster" <schuster.wolfgang@googlemail.com> writes:
> >
> >> \setupfloat[figure][default=none]
> >
> > Thanks, but that did not work.  The only thing that seems to work is
> > to put {none} for the caption.  However, that means I'm not going to
> > have captions in the manuscript version either.
>
> well, we can misuse the number= key .....
>
> % patch, goes in cont-new.tex
>
> \unprotect
>
> \def\presetfloatvariables#1#2#3#4%
>    {\doifcommonelse
>       {#2}
>       {\v!left,\v!right,\v!inner,\v!outer,%
>        \v!inleft,\v!inright,\v!inmargin,%
>        \v!backspace,\v!cutspace,%
>        \v!innermargin,\v!outermargin,\v!inneredge,\v!outeredge,%
>        \v!leftmargin,\v!leftedge,\v!rightmargin,\v!rightedge}
>       {\global\parfloattrue}
>       {\global\parfloatfalse}%
>     \ifinsidecolumns
>       \global\parfloatfalse
>     \fi
>     \global\sidefloatshift\zeropoint
>     \global\sidefloatmaximum\zeropoint
>     \global\chardef\sidefloatmethod\floatparameter\c!sidemethod
>     \global\chardef\textfloatmethod\floatparameter\c!textmethod
>     \global\chardef\sidefloatalign\zerocount
>     \globallet\floatrotation\!!zerocount
>     \calculatefloatskips
>     \ifparfloat
>       \processaction
>         [\floatparameter\c!sidealign]
>         [\v!height=>\global\chardef\sidefloatalign\plusone,%
>            \v!line=>\global\chardef\sidefloatalign\plustwo,% (***)
>           \v!depth=>\global\chardef\sidefloatalign\plusthree,%
>            \v!grid=>\global\chardef\sidefloatalign4,%
>        \v!halfline=>\global\chardef\sidefloatalign5]%
> % todo (test first):
> \doifinset\v!lokaal{#2}{\chardef\sidefloatalign\zerocount}%
>       \ifcase\sidefloatalign\relax % todo: optie v!lokaal => \else
>         \doifinset\v!height  {#2}{\global\chardef\sidefloatalign\plusone}%
>         \doifinset\v!line    {#2}{\global\chardef\sidefloatalign\plustwo}%
>         \doifinset\v!depth   {#2}{\global\chardef\sidefloatalign\plusthree}%
>         \doifinset\v!grid    {#2}{\global\chardef\sidefloatalign4}%
>         \doifinset\v!halfline{#2}{\global\chardef\sidefloatalign5}%
> meant for 'none'
>       \fi
>       \doifinset\v!high{#2}{\global\sidefloattopskip   \zeropoint}%
>       \doifinset\v!low {#2}{\global\sidefloatbottomskip\zeropoint}%
>       \doifinset\v!fit {#2}
>         {\global\sidefloattopskip   \zeropoint
>          \global\sidefloatbottomskip\zeropoint
>          \global\floatsideskip      \zeropoint}%
>     \else
>       \processallactionsinset
>         [#2]
>         [ 90=>\globallet\floatrotation\commalistelement,%
>          180=>\globallet\floatrotation\commalistelement,%
>          270=>\globallet\floatrotation\commalistelement]%
>     \fi
>     \doifinsetelse\v!nonumber{#2}
>       {\global\nofloatnumbertrue}
>       {\doifelse{\floatcaptionparameter\c!number}\v!yes
>          {\global\nofloatnumberfalse}
>          {\global\nofloatnumbertrue}}%
>     \ConvertToConstant\doifelse{#4}{}
>       {\global\emptyfloatcaptiontrue}
>       {\global\emptyfloatcaptionfalse}%
>     \doifinsetelse\v!none{#2}
>       {\global\nofloatcaptiontrue}
>       {\ConvertToConstant\doifelse{#4}\v!none
>          {\global\nofloatcaptiontrue}
>          {\global\nofloatcaptionfalse}}%
> \doif{\floatcaptionparameter\c!number}\v!none
>    {\global\nofloatcaptiontrue}%
>     \ifemptyfloatcaption \ifnofloatnumber
>       \global\nofloatcaptiontrue
>     \fi \fi}
>
> \protect
>
> \starttext
>
> \placefigure{}{}
>
> \setupcaptions[number=none]
>
> \placefigure{}{}
>
> \stoptext
>
> (I'll add that to the core, but only if you wikify it)

and what is the difference in the output compared with my solution,
the following works for me and I have no caption in the second figure.

\starttext

\placefigure{bla}{}

\setupfloat[figure][default=none]

\placefigure{bla}{}

\stoptext

Wolfgang
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Re: selectively turn off captions

[Hans Hagen]

Wolfgang Schuster wrote:

> and what is the difference in the output compared with my solution,
> the following works for me and I have no caption in the second figure.
> 
> \starttext
> 
> \placefigure{bla}{}
> 
> \setupfloat[figure][default=none]
> 
> \placefigure{bla}{}
> 
> \stoptext

in your case explicit placement keys override the default

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