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From |
Nick Cox <njcoxstata@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: manipulate ordering of rows matrices |

Date |
Tue, 10 May 2011 08:39:30 +0100 |

It would help if you explained the essence of the difference. What makes X2 sorted correctly? Nick On Tue, May 10, 2011 at 8:32 AM, <r.a.nobel@umail.leidenuniv.nl> wrote: > I'm having trouble with the following in Mata: > > From a large matrix X, I need a new matrix with unique values/rows. As an > example, when I use : > > x1 = uniqrows(X) > > Then, the matrix given is: > > x1 = ( > 1,0,0,0,0,0,0,0\ > 1,0,0,0,1,0,0,0\ > 1,0,0,1,0,0,0,0\ > 1,0,1,0,0,0,0,0\ > 1,1,0,0,0,0,0,0\ > 1,1,0,0,1,0,0,1\ > 1,1,0,1,0,0,1,0\ > 1,1,1,0,0,1,0,0 ) > > But what I need is: > > x2 = ( > 1,0,0,0,0,0,0,0\ > 1,0,1,0,0,0,0,0\ > 1,0,0,1,0,0,0,0\ > 1,0,0,0,1,0,0,0\ > 1,1,0,0,0,0,0,0\ > 1,1,1,0,0,1,0,0\ > 1,1,0,1,0,0,1,0\ > 1,1,0,0,1,0,0,1 ) > > Of course, this can be done easily for just this matrix, but the problem is that > I need the correct matrix as part of an estimation command (thus, the matrices > can be different everytime, dependent on the dataset at hand), so I need a sort > of general way to ensure the matrix is always sorted correctly. However, I've > not find a working strategy yet. * * 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: manipulate ordering of rows matrices***From:*r.a.nobel@umail.leidenuniv.nl

**References**:**st: manipulate ordering of rows matrices***From:*r.a.nobel@umail.leidenuniv.nl

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