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
[email protected]
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 <[email protected]> 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
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