in your case:
clear
input v1 v2 v3 v4 v5
2 3 5 10 6
1 2 8 13 6
end
xpose, clear
gen x = v1*v2
list
+---------------+
| v1 v2 x |
|---------------|
1. | 2 1 2 |
2. | 3 2 6 |
3. | 5 8 40 |
4. | 10 13 130 |
5. | 6 6 36 |
+---------------+
if you need it back into a vector:
keep x
xpose, clear
list
+-------------------------+
| v1 v2 v3 v4 v5 |
|-------------------------|
1. | 2 6 40 130 36 |
+-------------------------+
--- On Fri, 6/5/09, Nathan Danneman <[email protected]> wrote:
> From: Nathan Danneman <[email protected]>
> Subject: st: How can I loop a FOR command across columns of a matrix
> To: [email protected]
> Date: Friday, June 5, 2009, 2:44 AM
> Hello,
>
> I have a 2 x N matrix, such as the following...
>
> 2 3 5 10 6
> 1 2 8 13 6
>
> I would like to write a loop, such as foreach or forvalues,
> that will
> take the first and second element of each column, and use
> them for
> some operation, and then move on to subsequent columns.
>
> For examle,
>
> foreach column i...
> multiply row a times row b.
>
> Such that the above matrix would be turned into the vector
>
> 2 6 40 130 36.
>
> Is there a straightforward way to accomplish this without
> using Mata?
>
> Thanks,
> Nathan
>
> --
> "Imagination is more important than knowledge..."
> -- Albert Einstein
> *
> * For searches and help try:
> * http://www.stata.com/help.cgi?search
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
*
* For searches and help try:
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