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From |
"R.E. De Hoyos" <redeho@hotmail.com> |

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

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

Date |
Tue, 8 Nov 2005 18:15:03 -0000 |

I have access to Stata 9 only when I am in the University, in my laptop I have version 8.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.

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/

* * 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/

**References**:**st: RE: Re: RE: summing up matrix elements***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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