Well, the code for this is in `org-table-overlay-coordinate-overlays' in
org-table.el.  There isn't an existing flag for your request, but of course
you can play with that code as you like.

For example, if the `(setq ih (1+ ih))' is changed to `(setq id 0 ih (1+
ih))', the row numbers will start again from 1 after each hline.

Best wishes,
    Neil


On Mon, 23 Sep 2019 at 04:24, Nathan Neff <nathan.neff@gmail.com> wrote:

> I also re-read my initial question and your response *does* address my
> mis phrased question.  To rephrase my question, I have a table
> with these values:
>
> | heading col 0  | heading col 1 |
> | ------------------ | ----------------- |
> | A                   | B
> | C                  | D
>
> I found the org-table-toggle-coordinate-overlays
> which displays an overlay showing the row number:
>
> https://www.evernote.com/l/AOJvD5ty6RRIBYAcSWV-047CKCHT5NIAhl8
>
> I would like to know if there's a way to influence
> org-table-toggle-coordinate-overlays
> (e.g. some flag like "don't count rows before headings")
>
> Thanks,
> --Nate
>
>
>
>
>
>
> On Sun, Sep 22, 2019 at 10:22 PM Nathan Neff <nathan.neff@gmail.com>
> wrote:
>
>> Hi Neil,
>>
>> Unfortunately, no - This code will print the number of rows in my table -
>> it does
>> not add a column to my table, with numbering starting at the first row
>> under the
>> headline.
>>
>> I really like the example, where I can mess with the table using lisp
>> though - thank
>> you!
>> --Nate
>>
>> On Thu, Sep 19, 2019 at 9:13 AM Neil Jerram <neiljerram@gmail.com> wrote:
>>
>>> Does this answer your question?
>>>
>>> #+NAME: tt
>>> | num | ID |
>>> |-----+----|
>>> |   1 | A  |
>>> |   2 | B  |
>>> |   3 | C  |
>>> |   4 |    |
>>> |   5 | E  |
>>>
>>> #+BEGIN_SRC emacs-lisp :var tt=tt
>>> (length tt)
>>> #+END_SRC
>>>
>>> #+RESULTS:
>>> : 5
>>>
>>> Best wishes,
>>>     Neil
>>>
>>>
>>> On Wed, 18 Sep 2019 at 18:39, Nathan Neff <nathan.neff@gmail.com> wrote:
>>>
>>>> Hello all,
>>>>
>>>> I have a table like this:
>>>>
>>>>
>>>> | ID |
>>>> |----|
>>>> |  2 |
>>>> |  3 |
>>>>
>>>> and I want to know how many rows there are w/o the ID heading
>>>> and w/o the horizontal separator.  I found the
>>>> org-table-toggle-coordinate-overlays
>>>> which displays an overlay showing the row number:
>>>>
>>>> https://www.evernote.com/l/AOJvD5ty6RRIBYAcSWV-047CKCHT5NIAhl8
>>>>
>>>> However, the heading is included in the row number (which makes sense).
>>>>
>>>> Is there a way to ignore lines above a heading (or mark a heading in
>>>> some way?
>>>>
>>>> I found a way to add a seq. number by using Calc [1] but I was
>>>> wondering if
>>>> there's a way to tell the org-table-toggle-coordinate-overlays not to
>>>> count the
>>>> heading.
>>>>
>>>> Thanks,
>>>> --Nate
>>>>
>>>> [1]
>>>>
>>>>
>>>> | num | ID |
>>>> |-----+----|
>>>> |   1 | A  |
>>>> |   2 | B  |
>>>> |   3 | C  |
>>>> |   4 |    |
>>>> |   5 | E  |
>>>> #+TBLFM: $1=vlen(@I..0)
>>>>
>>>>
>>>> https://stackoverflow.com/questions/9267050/how-to-achieve-a-row-index-column-in-emacs-org-mode-using-a-calc-column-rule
>>>>
>>>>
>>>>