Thanks all for useful tips. I ended up doing something similar as a short
term fix for my float number override issue, basically setting up a new
float type to use for the deviant ones and then resetting the numbering of
the existing ones. It would be great if there was a facility to just drop
in an override on an individual float using the equivalent of
ownnumber={27.1b}, but I appreciate this may be much more complex under the
hood than it seems to a mere mortal. Certainly my brief perusal of the
sources left me baffled, as usual!

Thanks again.

Duncan

On Mon, 24 Aug 2020 at 22:51, Taco Hoekwater <taco@elvenkind.com> wrote:

>
>
> > On 24 Aug 2020, at 19:59, Wolfgang Schuster <
> wolfgang.schuster.lists@gmail.com> wrote:
> >
> >>
> >>
> >> \setcounter[figure][5] % next figure is no.6
>
> For this subfigure stuff, perhaps this is useful?
>
> % setup definitions
> \definecounter[subfigure][way=bytext,prefix=no]
> \setupcounter[subfigure][state=start,numberconversion=a]
> \setcounter[subfigure][1]
>
> \def\setsubfigures
>   {\setcounter[subfigure][1]
>    \incrementcounter[figure]
>
>  \setupcaption[figure][state=stop,numberstopper={\convertedcounter[subfigure]}]}
>
> \def\unsetsubfigures
>   {\setupcaption[figure][state=start,numberstopper=]}
>
> %usage
> \setsubfigures
>
> \startplacefigure[title=Test figure]
> \externalfigure[dummy]
> \stopplacefigure
>
> \incrementnumber[subfigure]
>
> \startplacefigure[title=Test another figure]
> \externalfigure[dummy]
> \stopplacefigure
>
> \unsetsubfigures
>
>
> I could not find a safe way to increment the subfigure number
> automatically, unfortunately.
>
> Best wishes,
> Taco
>
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