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# Re: st: list x matrix

 From Scott Merryman To statalist@hsphsun2.harvard.edu Subject Re: st: list x matrix Date Sat, 27 Mar 2010 15:35:47 -0500

```You could use -mkmat- to convert the x variables to matrix, perform
the multiplication and then use -svmat- to create the  variables from
matrix.

For example:

. sysuse auto,clear
(1978 Automobile Data)

. matrix b = 10, 2, -3
. mkmat mpg price, mat(X)
. count
74
. mat X = J(r(N),1,1), X
. matrix z = X*b'
. svmat z

Scott

On Sat, Mar 27, 2010 at 2:49 PM, richard boylan <richardtb25@gmail.com> wrote:
> Very simple question, but I couldn't find the answer in the STATA documentation.
>
> I have a list
> local var "x1 x2 x3 ...."
>
> and a 1 x n matrix (vector)
>
> b = (b1 b2 b3 ..)
>
> How do I compute the new variable
>
> z = b1*x1 + b2*x2 + b3*x3  + ...
>
> I mean I know how to do that by writing the sum, there just has to be
> a better way of doing this.
>
> Also, what it is the best place to figure out this stuff?
>
> Thanks.
>
> Richard
> *
> *   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/
>

*
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```