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

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

Subject |
RE: st: RE: Adding Matrices generated from a loop |

Date |
Fri, 24 Aug 2007 14:25:00 +0100 |

Well, initialise outside the loop, and add each replaced t_i to the sum so far each time round the loop. Naturally, all the matrices must be conformable. Nick n.j.cox@durham.ac.uk Nadeem Shafique > Sorry for not providing complete information, I am trying it using > Mata. Following is the code i am trying to execute. > > ************************************************************** > ****************************** > for (i=1; i<=rows(info); i++) > { > v_i = > panelsubmatrix(v, i, info) > m_i = panelsubmatrix(m,i,info) > n_i = panelsubmatrix(s,i,info) > n = mean(n_i) > t_i=v_i*m_i*n > > } > > ****************** I want to sum all these t_i in one matrix say "t" > On 8/24/07, Nick Cox <n.j.cox@durham.ac.uk> wrote: > > There may be subtleties here I am missing, but > > I would initialise > > > > sum <- first_matrix > > > > and then loop over the other matrices > > > > sum <- sum + next_matrix > > > > This is pseudocode. > > > > Otherwise I can't tell what's troubling you about > > this. As the details will depend on whether > > you are using Stata or Mata, your naming structure, > > what else you are doing with these matrices, > > whether the number is predictable in advance, etc., > > none of which is indicated, I'll leave it there. > > Nadeem Shafique > > > > > I want to add several matrices (say K) of the same order, > suppose the > > > matrices to be added are comming from a loop, how can i > calculate the > > > following > > > > > > K > > > Sum X_i > > > i=1 > > > where X_i is the ith Matix * * 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**:**RE: st: RE: Adding Matrices generated from a loop***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

**References**:**Re: st: RE: Adding Matrices generated from a loop***From:*"Nadeem Shafique" <nadeemshafique@gmail.com>

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