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# Re: st: Re: Stata matrix to Mata matrix form

 From Nick Cox To statalist@hsphsun2.harvard.edu Subject Re: st: Re: Stata matrix to Mata matrix form Date Thu, 1 Nov 2012 15:29:39 +0000

```Looks symmetric to me.

If a matrix is symmetric, Stata says so, and only displays the lower
half (including the principal diagonal).

In your case, Stata is doing exactly that.

Here is another example:

. mata : I(3)
[symmetric]
1   2   3
+-------------+
1 |  1          |
2 |  0   1      |
3 |  0   0   1  |
+-------------+

If this is not what you mean, you'll have to explain what "doesn't
work" means exactly.

Nick

On Thu, Nov 1, 2012 at 3:16 PM, Bianca B. <bianca268@yahoo.com> wrote:
> Dear Nick,
>
> Thanks a lot. I converted a lower-triangular matrix from stata to mata form to apply the mata makesymmetric command but it doesn't work.
> The command is
>
> : makesymmetric(mat_S2)
> [symmetric]
>        1   2
>     +---------+
>   1 |  0      |
>   2 |  1   0  |
>     +---------+
>
> Would you have any suggestion?
> Best,
> Bianca
>
>
>
> . mat foo = J(6,7,42)
>
> . mat li foo
>
> foo[6,7]
>     c1  c2  c3  c4  c5  c6  c7
> r1  42  42  42  42  42  42  42
> r2  42  42  42  42  42  42  42
> r3  42  42  42  42  42  42  42
> r4  42  42  42  42  42  42  42
> r5  42  42  42  42  42  42  42
> r6  42  42  42  42  42  42  42
>
> . mata : mat_foo = st_matrix("foo")
>
> . mata : mat_foo
>         1    2    3    4    5    6    7
>     +------------------------------------+
>   1 |  42   42   42   42   42   42   42  |
>   2 |  42   42   42   42   42   42   42  |
>   3 |  42   42   42   42   42   42   42  |
>   4 |  42   42   42   42   42   42   42  |
>   5 |  42   42   42   42   42   42   42  |
>   6 |  42   42   42   42   42   42   42  |
>     +------------------------------------+
>
> . mata : st_matrix("foo", mat_foo :/ 7)
>
> . mat li foo
>
> foo[6,7]
>     c1  c2  c3  c4  c5  c6  c7
> r1   6   6   6   6   6   6   6
> r2   6   6   6   6   6   6   6
> r3   6   6   6   6   6   6   6
> r4   6   6   6   6   6   6   6
> r5   6   6   6   6   6   6   6
> r6   6   6   6   6   6   6   6
>
> --- On Thu, 11/1/12, Bianca B. <bianca268@yahoo.com> wrote:
>
>> From: Bianca B. <bianca268@yahoo.com>
>> Subject: Stata matrix to Mata matrix form
>> To: statalist@hsphsun2.harvard.edu
>> Date: Thursday, November 1, 2012, 7:25 AM
>> Hi Stata users,
>>
>> Does anyone know how can I get stata matrix in mata matrix?
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```