LyX display of align counters

[Daniel]

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.

> 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?

Best,
Daniel