Use Mata.
: x = uniform(3,3) :- 0.5
: x
1 2 3
+----------------------------------------------+
1 | .3714490768 -.2448501205 -.4554811986 |
2 | -.0758442807 .3983461575 .0219247625 |
3 | .3414094402 -.2889923407 .0644091703 |
+----------------------------------------------+
: y = abs(x)
: y
1 2 3
+-------------------------------------------+
1 | .3714490768 .2448501205 .4554811986 |
2 | .0758442807 .3983461575 .0219247625 |
3 | .3414094402 .2889923407 .0644091703 |
+-------------------------------------------+
If you are on Stata <9, then do say so in your postings.
In that case, one inelegant but functional tool
is -matmap- from SSC.
Nick
[email protected]
Tom Boonen
> is there an elegant way to create a matrix that contains the absolute
> values of the entries of another matrix?
>
> Something like:
>
> matrix w = (1 , -1 \ 2, -2)
> matrix list w
>
> *w[2,2]
> *c1 c2
> *r1 1 -1
> *r2 2 -2
>
> * But then:
>
> . matrix w = abs(w)
> type mismatch
> r(109);
*
* 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/
