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From |
Tirthankar Chakravarty <tirthankar.chakravarty@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Transform matrices |

Date |
Mon, 20 Dec 2010 01:40:58 -0800 |

Using the Mata -rowshape()- function: ************************************* clear* mat define A = (1, 2, 3, 4, 5, 6)' mata: st_matrix("B", rowshape(st_matrix("A"), 3)) mat list B ************************************* T On Mon, Dec 20, 2010 at 1:24 AM, <u.atz@lse.ac.uk> wrote: > Dear matrix wizards, > > I tried to get a column vector into a matrix format, such as > > 1 > 2 > 3 > 4 > 5 > 6 > > into > > 1 2 > 3 4 > 5 6 > > for a general specification. > > My clumsy solution was to create two loops > > clear > mat def A = (1\ 2\ 3\ 4\ 5\ 6) > > forvalues n = 1(2)5 { > mat a`n' = A[`n', 1] > if `n' == 1 local m = "`n'" > else local m = "`m' \ `n'" > mat c1 = (`m') > } > > forvalues n = 2(2)6 { > mat a`n' = A[`n', 1] > if `n' == 2 local k = "`n'" > else local k = "`k' \ `n'" > mat c2 = (`k') > } > > mat B = (c1, c2) > > mat list B > > > Surely there is a more elegant (and more general) way? Perhaps Mata is the solution? > > This is a rather academic exercise, but it would be nice if someone could share his/her potential code example. > > Cheers, > Ulrich > > > Please access the attached hyperlink for an important electronic communications disclaimer: http://lse.ac.uk/emailDisclaimer > > * > * 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/ > -- To every ω-consistent recursive class κ of formulae there correspond recursive class signs r, such that neither v Gen r nor Neg(v Gen r) belongs to Flg(κ) (where v is the free variable of r). * * 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/

**Follow-Ups**:**Re: st: Transform matrices***From:*Tirthankar Chakravarty <tirthankar.chakravarty@gmail.com>

**References**:**st: Transform matrices***From:*u.atz@lse.ac.uk

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