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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: RE: re: how to form a vector for each line |

Date |
Thu, 15 Oct 2009 18:20:03 +0100 |

I agree with everything you say, except that a variable is an ordered array with a single subscript too, even though that won't help you much in calculating an outer product.... Also, Mata lets you think it has the concept of a vector.... Nick n.j.cox@durham.ac.uk Christopher Baum To be pedantic, Stata (as opposed to Mata) does not and never has had vectors. Vectors are ordered arrays with a *single* subscript. There is no way to create such an object in Stata. You can have matrices with one row or one column (or both) that look like vectors, but to use them you must include both a row subscript and a column subscript in the notation. In that annoying way, Stata's old matrix language does not allow vectors at all. Mata has the concept of a vector, and allows you to reference an element as nj[42] rather than nj[42,1] or nj[1,42]. IMHO this is a good reason to avoid the old matrix language when you can, as it unnecessarily complicates working with 'real' vectors such as e(b). Nick said Some readers may find Martin's opening sentence a little puzzling, however. In Stata, as compared with Mata, there is no difficulty in setting up row or column vectors, which are just matrices with one row or column. In this sense, Stata has had the idea of vector for several versions now. * * 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/

**References**:**st: re: how to form a vector for each line***From:*Christopher Baum <baum@bc.edu>

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