matrix recursive element

[Daniel Morales]

Hi, I want to run this code

local filas = 300
local columnas = 1
matrix A = J(`filas',`columnas',0)
matrix A[1,1] = 1
forvalues i = 2/`filas' {
matrix A[`i',1] = matrix A[`i'-1,1] + rnormal()
}
matrix list A

but, when

matrix A[`i',1] = matrix A[`i'-1,1] + rnormal()

is excuted stata shows "matrix not found".

[Joseph Coveney]

Try

matrix define A[`i', 1] = A[`i'-1, 1] + rnormal()

[Daniel Morales]

Hi, it does not work

. local filas = 300

. local columnas = 1

. matrix A = J(`filas',`columnas',0)

. matrix A[1,1] = 1

. forvalues i = 2/`filas' {
  2.   matrix define A[`i',1] = matrix A[`i'-1,1] + rnormal()
  3. }
matrix not found
r(111);

[Joseph Coveney]

Hi, it does not work

You missed it. Copy and paste my code in place of yours, paying particular attention to the expression on the right-hand side of the assignment.

[Daniel Morales]

I'm sorry Joseph, I didnt catch that, could you be more explicit?

[Daniel Morales]

I already did, thank you mr. Coveney.