st: generate variable equal to first non-zero value in row

[D-Ta <altruist81@gmx.de>]

Dear Statausers,

I have a dataset with the variables id and and out1-out5 where the "out" 
variables represent sequential outcomes. I would like to generate a 
variable (in the example below named first_nonzero) which indicates the 
first outcome in the sequence row that is non zero. If there are all 
zeros throughout, that indicator variable should be set/remain missing.

The following table illustrateswhat I am trying to do. How do I generate 
the first_nonzero variable? (I was trying to work with the -egenmore- 
commands, but couldnt figure out).

id 	out1 	out2 	out3 	out4 	out5 	first_nonzero
1 	0 	0 	0 	2 	2 	2
2 	0 	2 	2 	0 	0 	2
3 	0 	0 	0 	0 	0 	                      .
4 	4 	4 	4 	0 	0 	4
5 	3 	0 	2 	2 	2 	3
6 	0 	4 	4 	4 	0 	4


Many thanks,
Darjusch
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