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

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

Subject |
st: RE: Re: RE: Re: RE: summing up matrix elements |

Date |
Tue, 8 Nov 2005 18:24:09 -0000 |

OK. Jamie's solution is still presumably better in Stata 8. When Jeroen and then I wrote some crude matrix add-ons in 1997-2000, -vec()- had not been implemented, I believe. STB-56 dm79 . . . . . . . . . . . . . . . . . . Yet more new matrix commands (help matcorr, matewmf, matvsort, svmat2 if installed) . . N. J. Cox 7/00 pp.4--8; STB Reprints Vol 10, pp.17--23 commands to produce a correlation matrix, elementwise monadic function of another matrix, selected subsets of matrix rows and columns, vec or vech of a matrix, elements sorted within a vector, matrix from a vector, and commands to save matrices STB-50 dm69 . . . . . . . . . . . . . . . . . . Further new matrix commands (help matdelrc, matewm, matmad, matpow if installed) . . . N. J. Cox 7/99 pp.5--9; STB Reprints Vol 9, pp.29--34 collection of new matrix commands providing additional matrix checking, management, element-wise operators, maximum absolute difference, and power STB-39 dm49 . . . . . . . . . . . . . . . . . . . . Some new matrix commands (help matfunc, varfunc if installed) . . . . . . . . . . . J. Weesie 9/97 pp.17--20; STB Reprints Vol 7, pp.43--48 collection of new matrix commands; several for explicit matrices and a few for implicit matrices (i.e., variables) Nick n.j.cox@durham.ac.uk > -----Original Message----- > From: owner-statalist@hsphsun2.harvard.edu > [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of > R.E. De Hoyos > Sent: 08 November 2005 18:15 > To: statalist@hsphsun2.harvard.edu > Subject: st: Re: RE: Re: RE: summing up matrix elements > > > > Offhand, I can't think of any reason why anyone > > with Stata 9 would prefer that. Nor, I imagine, > > would Jeroen if he were to be asked. > > I have access to Stata 9 only when I am in the University, in > my laptop I > have version 8. > > Rafa > > ----- Original Message ----- > From: "Nick Cox" <n.j.cox@durham.ac.uk> > To: <statalist@hsphsun2.harvard.edu> > Sent: Tuesday, November 08, 2005 5:59 PM > Subject: st: RE: Re: RE: summing up matrix elements > > > > You may be thinking of Jeroen Weesie's -matsum-. > > Offhand, I can't think of any reason why anyone > > with Stata 9 would prefer that. Nor, I imagine, > > would Jeroen if he were to be asked. > > > > STB-39 dm49 . . . . . . . . . . . . . . . . . . . . Some > new matrix > > commands > > (help matfunc, varfunc if installed) . . . . . . . > . . . . J. > > Weesie > > 9/97 pp.17--20; STB Reprints Vol 7, pp.43--48 > > collection of new matrix commands; several for > explicit matrices > > and a few for implicit matrices (i.e., variables) > > > > Nick > > n.j.cox@durham.ac.uk > > > > R.E. De Hoyos > > > >> Both your solutions work fine, thanks a lot. > >> I though there was a non-mata matrix function similar to > >> mata's -sum(C)- > > > > Nick Cox > > > > . mata : sum_r = (sum(C) - trace(C)) / 2 > > > > R.E. De Hoyos > > > >> >> > Is there a way to to get a scalar containing the sum of the > >> >> > off-diagonal > >> >> > elements of a pre-defined matrix? > >> >> > > >> >> > For instance, define matrix C as a correlation matrix. I > >> >> > want to know what > >> >> > is the sum of correlations between the various elements in C. > >> >> > Therefore I > >> >> > need the sum of all elements in C minus the sum of the > >> >> > diagonal elements > >> >> > (-trace(C)-) and finally divide it by 2 (I am assuming > >> matric C is > >> >> > symetric). * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**st: Spearman correlations in Stata 8***From:*"Vasilis.Sarafidis" <vs242@cam.ac.uk>

**st: Re: RE: Re: RE: Re: RE: summing up matrix elements***From:*"R.E. De Hoyos" <redeho@hotmail.com>

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