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From |
u.atz@lse.ac.uk |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Transform matrices |

Date |
Mon, 20 Dec 2010 12:01:43 +0000 |

I like it, thanks. > > More generally, you can use selection vectors: > > ************************************* > clear* > mat define A = (1, 2, 3, 4, 5, 6)' > mata > mA = st_matrix("A") > st_matrix("B", (mA[2:*(1::length(mA)/2):-1,1], /// > mA[2:*(1::length(mA)/2),1])) > end > mat list B > ************************************* > > T > > On Mon, Dec 20, 2010 at 1:40 AM, Tirthankar Chakravarty > < > tirthankar.chakravarty@gmail.com > > wrote: > > 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). > > > > 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/

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