Counter in Mata

[Christian Velasquez]

Hello, I am writing a code in Mata. In this code I need to create some matrix R1, R2 , R3 ,...,Rn
In Stata, I could write:
forvalues h =1/n {
... commands....
matrix R`h'= expression
}
However, I don't know how to do this in Mata
Help me , please!!!

[Niels Henrik Bruun]

Hi Christian
Try and look at the link below.
Especially Matthew's comment.

[Christophe Kolodziejczyk]

You can use a vector of pointers

. mata:
------------------------------------------------- mata (type end to exit) -----------------------------------------------------------------
: 
: a = J(1,2,NULL)

: 
: for (i=1;i<=cols(a);i++) {
>                 a[1,i] = &J(i,i,i)
> 
> }

: 
: a
               1           2
    +-------------------------+
  1 |  0x2154470   0x21e8f10  |
    +-------------------------+

: *a[1,1]
  1

: *a[1,2]
[symmetric]
       1   2
    +---------+
  1 |  2      |
  2 |  2   2  |
    +---------+

: 
: for (i=1;i<=cols(a);i++) {
>                 *(a[1,i]) = J(1,1,.)
> 
> }

: 
: a
               1           2
    +-------------------------+
  1 |  0x2154470   0x21e8f10  |
    +-------------------------+

: *a[1,1]
  .

: *a[1,2]
  .

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