LyX display of align counters

[Scott Kostyshak]

On Sat, Feb 19, 2022 at 05:20:03AM +0100, Daniel via lyx-users wrote:
> On 2022-02-18 22:15, Scott Kostyshak via lyx-users wrote:
> > On Fri, Feb 18, 2022 at 09:53:32PM +0100, Daniel via lyx-users wrote:
> > > On 2022-02-18 17:03, Scott Kostyshak via lyx-users wrote:
> > > > On Fri, Feb 18, 2022 at 02:52:35PM +0100, Daniel via lyx-users wrote:
> > > > > On 17/02/2022 14:06, Scott Kostyshak via lyx-users wrote:
> > > > > > I like to renumber my align numbers within frame. e.g., Instead of "equation
> > > > > > 3", I essentially use them as "3rd line of equation on this frame" which makes
> > > > > > it easy for students to ask questions and refer to the line number.
> > > > > > 
> > > > > > I do this with the following LaTeX code in the preamble:
> > > > > > 
> > > > > > \AtBeginEnvironment{align}{\setcounter{equation}{0}}
> > > > > > 
> > > > > > I'm greedy and would like to adapt the LyX layout to show the same.
> > > > > > 
> > > > > > Specifying "Within" frame seems to almost do what I want:
> > > > > > 
> > > > > > Counter equation
> > > > > > 	Within               frame
> > > > > > End
> > > > > > 
> > > > > > However, if I'm on Frame 10, it will show 10.1, 10.2, etc..., where I would
> > > > > > prefer just 1, 2, ...
> > > > > > 
> > > > > > If the above can't be tweaked to work, perhaps a different approach to using
> > > > > > "Within" would be to have the Frame layout reset the equation counter to 0?
> > > > > > 
> > > > > > Scott
> > > > > 
> > > > > Maybe you could provide a minimal example of the frame setup you have? I
> > > > > guess you are working with some "frame" counter definition.
> > > > 
> > > > Ah indeed there is some interaction with another local patch I have
> > > > applied. I don't think the patch is necessary to reproduce the issue in
> > > > this thread (without it, it seems LyX marks them as #.1, #.2, #.3, #.4;
> > > > but for completeness I attach it (it is against current master).
> > > > 
> > > > I also attach an example .lyx file. I saved it as 2.3.x format just for
> > > > simplicity, but I am testing on current master. Note that the LyX file
> > > > has a preamble (that resets the counter to 0 in LaTeX) as well as a
> > > > local layout (that specifies the Within).
> > > > 
> > > > I also attach a screenshot, which has Frame number patch applied.
> > > > Instead of the equation labels "1.1, 1.2, 2.1, 2.2", I would prefer
> > > > "1, 2, 1, 2" in the LyX display.
> > > > 
> > > > Thanks,
> > > > Scott
> > > 
> > > Like so:
> > > 
> > > Counter equation
> > >    Within      frame
> > >    LabelString \arabic{equation}
> > > End
> > > 
> > > ?
> > 
> > Perfect! Thanks.
> > 
> > > By the way, why do you use
> > > 
> > > \AtBeginEnvironment{align}{\setcounter{equation}{0}}
> > > 
> > > rather than
> > > 
> > > \AtBeginEnvironment{frame}{\setcounter{equation}{0}}
> > > 
> > > ?
> > > 
> > > If you use the latter, you can use different equation environments without
> > > getting ambiguous numbers within a frame.
> > 
> > That's a good idea. I might change to that. The reason why I initially
> > chose "align" was so that if I do two (small) aligns on one frame, both
> > would restart to (1). But that's a very rare situation anyway.
> 
> Okay, so you want them to restart at (1) on the same frame. So, if you had
> two equation environments on one frame you couldn't say "3rd line of
> equation on this frame" but would have to say "3rd line of the first
> equation on this frame" or so.

Indeed there would be ambiguity.

> > I guess I might want to do both of the above LaTeX commands, in theory.
> > Almost all the time though, it's just one align on one frame so it won't
> > make a big difference.
> 
> If you have the latter command, the former seems superfluous because you
> cannot have an equation that goes over more than one frame, or?
> 
> The former (your) LaTeX command mimics what enumerated lists do. Just notice
> that the layout code I provided restarts within frame and hence mimics the
> latter LaTeX command above not the former. I am not sure that it is
> currently possible to mimic enumerated list counters in LyX. For example,
> 
> Counter equation
>   Within      equation
>   LabelString \arabic{equation}
> End
> 
> just leads to a crash. (Maybe for obvious reasons?) Maybe what would be
> needed is a reset of a counter depending on an environment rather than
> another counter?

Ah true that is a good idea. I suppose the first step is for me to
figure out what I really want :). Thanks for your comments above. I'll
think more and test a couple of things.

Scott
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