Folks, I'm puzzled. Look here:
<hansl>
nulldata 6
set seed 123
series x = uniform()
x[2] = NA
series z = ok(x) && (x < 0.5) ? x : 0
print x z -o
</hansl>
this produces
<output>
x z
1 0.2103124 0.2103124
2
3 0.0003299 0.0003299
4 0.5931556 0.000
5 0.9869412 0.000
6 0.6499468 0.000
</output>
Which is IMO wrong. I can see the logic in stipulating that anything
involving NAs is NA but OTOH I would say that ( 0 && NA ) should be 0.
Note, moreover, that
<hansl>
series z = missing(x) || (x >= 0.5) ? 0 : x
</hansl>
would work the way I'd expect it to.
Am I missing something?
-------------------------------------------------------
Riccardo (Jack) Lucchetti
Dipartimento di Scienze Economiche e Sociali (DiSES)
Università Politecnica delle Marche
(formerly known as Università di Ancona)
r.lucchetti(a)univpm.it
http://www2.econ.univpm.it/servizi/hpp/lucchetti
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