I have a data frame with integers mixed with a lot of NULLs, how do I convert
that to multiple lists of integers with zero (to replace NULL)? I tried the
following, and they failed:

> dim(g2)
[1] 25352   173
> class(g2)
[1] "data.frame"
> class(g2[1,])
[1] "data.frame"
> g2[1,30:40]
          30 31 32   33 34 35 36   37   38   39   40
NM_000014  1 14  1 NULL 27  8 21 NULL NULL NULL NULL
> g3<-as.integer(g2[1,30:40])
> g3
 [1] NA NA NA NA NA NA NA NA NA NA NA
>

thanks a lot!

-Kenny
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