[Orgmode] questions about table mode and spreadsheets

[Inquisitive Scientist]

Dear Experts,

I am becoming very fond of the table/spreadsheet in org-mode and trying to use it more extensively. I have tried digging through the docs but am still having trouble with some things:

  1. Is there a way to dynamically add a new row to a table using a table formula? For example, a variety of org-mode things will produce a table as output and allow me to specify some formulas. I'd like to add a formula that says something like "create a row at the bottom that sums column 3" and have that be a new row that gets added. Any thoughts?

  2. How do I compute the sum of a column only if a corresponding row matches some condition? For example, how do I compute the sum of numbers in column a for which the name in column "name" is "bar"? For example, I should get 7 for the sum in column a in the table below:

| name | a | b | c |
|------+---+---+---|
| foo  | 1 | 2 | 3 |
| bar  | 3 | 2 | 1 |
| bar  | 4 | 5 | 6 |
|------+---+---+---|

Thanks,
-I.S.