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
>>>
>>>
>>>