st: RE: matsum - matrix sums of rows

 From "Nick Cox" <[email protected]> To <[email protected]> Subject st: RE: matsum - matrix sums of rows Date Thu, 24 Aug 2006 14:14:53 +0100

```A third alternative to your search is to look at the program
itself. It is just more Stata.

After your command you have a new matrix -r- in memory,
so its elements are

r[1,1], r[2,1], ....

In the help,

matsum A [, row(mat_name) column(mat_name) all(mat_name) display format(fmt)]

Computes and/or displays the row-wise, column-wise and over-all maximum,
minimum, and sum over the elements of a matrix. More than one operator may
be specified simultaneously. These commands default to the column-wise
operators.

the implication is that you are naming a new matrix with whatever you
supply as mat_name.

Nick
[email protected]

Fabrizio Gilardi Ph.D.

> I've been using the -matsum- command written by Jeroen Weesie. I
> would like to access the results (notably the sums of rows) to use
> them in further operations: how can I do this? I've perused the help
> and Statalist's archives, but I couldn't find a solution.
>
> Example:
>
> . matrix A=(1,2,3 \ 4,5,6)
>
> . matrix list A
>
> A[2,3]
>      c1  c2  c3
> r1   1   2   3
> r2   4   5   6
>
> . matsum A, r(r) d
>
> row-wise sums of matrix A[2,3]
>
>      c1
> r1   6
> r2  15
>
>
> How can I access the sum of the first row of A (i.e. 6) and that of
> the second row of A  (i.e. 15)?
>
> I'm still using Stata 7, but I should receive Stata 9 soon.

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```