Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: st: Re: Stata matrix to Mata matrix form
From
Nick Cox <[email protected]>
To
[email protected]
Subject
Re: st: Re: Stata matrix to Mata matrix form
Date
Thu, 1 Nov 2012 16:34:49 +0000
You've lost me. What is mat_S2[1,2]?
Nick
On Thu, Nov 1, 2012 at 3:39 PM, Bianca B. <[email protected]> wrote:
> 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/