Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.

# st: Mata question on replacing missing values

 From Matthew Baker To statalist@hsphsun2.harvard.edu Subject st: Mata question on replacing missing values Date Thu, 22 Dec 2011 09:45:21 -0500

```Dear Listers:

I am curious if there is a simple solution to the following
problem in Mata. I have two vectors (call them X and Y). X has missing
values, while Y does not. What I would like to do is make a third
vector, Z, which is composed of X when the value of X is not missing,
and Y otherwise. For example, if I have X=(5,6,.,.,4)', and
Y=(1,5,3,2,3)', I would like Z to be Z=(5,6,3,2,4)'. In order:

: X,Y,Z
1   2   3
+-------------+
1 |  5   1   5  |
2 |  6   5   6  |
3 |  .   3   3  |
4 |  .   2   2  |
5 |  4   3   4  |
+-------------+

Is there a simple solution?

Matt Baker

--
Dr. Matthew J. Baker
Department of Economics
Hunter College and the Graduate Center, CUNY
*
*   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/
```