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Re: st: Re: Stata matrix to Mata matrix form
From
"Bianca B." <[email protected]>
To
[email protected]
Subject
Re: st: Re: Stata matrix to Mata matrix form
Date
Thu, 1 Nov 2012 08:39:34 -0700 (PDT)
Nick, you're right, I'm sorry. I didn't specify that I need to turn my lower-triangular matrix into a symmetrical matrix by reflecting the lower triangular elements across the diagonal. So starting from this matrix
mat_S2
1 2
+---------+
1 | 0 |
2 | 1 0
|
+---------+
I'd like to obtain a matrix like that
1 2
+---------+
1 | 0 1 |
2 | 1 0 |
+---------+
--- On Thu, 11/1/12, Nick Cox <[email protected]> wrote:
> From: Nick Cox <[email protected]>
> Subject: Re: st: Re: Stata matrix to Mata matrix form
> To: [email protected]
> Date: Thursday, November 1, 2012, 8:29 AM
> 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. <[email protected]>
> 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. <[email protected]>
> wrote:
> >
> >> From: Bianca B. <[email protected]>
> >> Subject: Stata matrix to Mata matrix form
> >> To: [email protected]
> >> Date: Thursday, November 1, 2012, 7:25 AM
> >> Hi Stata users,
> >>
> >> Does anyone know how can I get stata matrix in mata
> matrix?
> *
> * For searches and help try:
> * http://www.stata.com/help.cgi?search
> * http://www.stata.com/support/faqs/resources/statalist-faq/
> * http://www.ats.ucla.edu/stat/stata/
>
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/faqs/resources/statalist-faq/
* http://www.ats.ucla.edu/stat/stata/