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Re: st: "Correct" way to convert a vector into a matrix


From   Richard Herron <richard.c.herron@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: "Correct" way to convert a vector into a matrix
Date   Fri, 23 Dec 2011 11:45:17 -0500

Thanks, Matt and Scott! I didn't realize it was so easy to move back
and forth between Mata and Stata.

On Fri, Dec 23, 2011 at 11:35, Scott Merryman <scott.merryman@gmail.com> wrote:
> You can use mata's -rowshape- :
>
> clear*
> matrix temp_vector = (1, 2, 3, 4, 5, 6, 7, 8, 9)
> mata: st_matrix("x", rowshape( st_matrix("temp_vector")', 3) )
> mat list x
>
> Scott
>
>
> On Fri, Dec 23, 2011 at 10:21 AM, Richard Herron
> <richard.c.herron@gmail.com> wrote:
>> I would like to convert a vector, which I think is really a row matrix
>> in Stata, into a square matrix. I have a loop solution that works, but
>> it seems too awkward to be the "correct" approach. Is there a one (or
>> two) line solution? I found a lot of matrix functions regarding
>> diagonals, but none that wrap a vector into a matrix.
>>
>> In this case -svar- provides the long-run restriction matrix as a
>> vector where entries are down columns, then across rows.
>>
>> * begin code
>> matrix temp_vector = (1, 2, 3, 4, 5, 6, 7, 8, 9)
>> matrix temp_matrix = J(3, 3, 0)
>> foreach i of numlist 1/3 {
>>    foreach j of numlist 1/3 {
>>        scalar temp_scalar = `= `j' - 1' * 3 + `i'
>>        matrix temp_matrix[`i', `j'] = el(temp_vector, 1, temp_scalar)
>>    }
>> }
>> matrix list temp_matrix
>> * end code
>>
>> Thanks!
>> *
>> *   For searches and help try:
>> *   http://www.stata.com/help.cgi?search
>> *   http://www.stata.com/support/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/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
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*   http://www.ats.ucla.edu/stat/stata/


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