Defining a variable fitting to the size of a matrix

[Constantin Hipp]

Hey everyone,
im still new to stata so this is probably still a trivial question . for further computations i'd like to define a variable that adjusts itself to the number of variables of the quadratic matrix i work with. so e.g.i put in a 9x9 quadratic matrix my variable should be n = 9 in this case. thanks for any help!!

Best

[William Lisowski]

What do you need that the mata rows() and/or columns() functions do not provide?

. mata:
------------------------------------------------- mata (type end to exit) ------
: A = I(3)

: n = rows(A)

: A
[symmetric]
       1   2   3
    +-------------+
  1 |  1          |
  2 |  0   1      |
  3 |  0   0   1  |
    +-------------+

: n
  3

: end
--------------------------------------------------------------------------------

[Constantin Hipp]

Oh its actually as simple as that thanks a lot!!