rowsum in STATA

[Łukasz Ambroziak]

Dear All,

I am a user of STATA/SE 13.1 and have problem with suming matrix by row.
Example:
I have a matrix:

1 2 3
A = 2 0 -1
3 -2 0
and want to create matrix being a sum of rows of matrix A:

6
B = 1
1

I was using in STATA command matrix B=rowsum(A). The result was: "unknown function rowsum()". r(133).
Why does it not wark?

One more question: is it possible to operate in STATA SE on matrix [50000 x 1]?

Thank you in advance for answer.

Łukasz

[Nick Cox]

Please note that the correct spelling is Stata, not STATA. http://www.statalist.org/forums/help#spelling

There is no Stata function rowsum(). There are some add-ons to do such things, but it's better to use Mata, e.g.

. matrix A = (1, 2, 3\2, 0, -1\3, -2, 0) 

. mat li A

A[3,3]
    c1  c2  c3
r1   1   2   3
r2   2   0  -1
r3   3  -2   0

. mata : rowsum(st_matrix("A"))
       1
    +-----+
  1 |  6  |
  2 |  1  |
  3 |  1  |
    +-----+

So, the question is Why you thought it would work.

See

help limits

for limits on matrix size. A matrix with 50,000 rows would need to be held in Mata.

[Łukasz Ambroziak]

Thank you for your hepl.