R devel - Aug 2011 - Use logical expresion on ff object

I want to do operation with ff vector from packages ff like simple operation
in R like this. (I have read data from file)
Example 
a=1:10
b=a[a>5]

how to do this operation with ff packages:
Example :
a=ff(1, length=15*10^7)

I know that I could get logical vector like this:

k=bit(15*10^7) # from bit packages
a=ff(-1,15*10^7)
system.time(
		for (i in chunk(a)){ k[i]<- a[i]<1}
)

Any suggestions?

Best,
Krystian



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2011/8/18 Krystian Radlak <radler12@op.pl>
> Any suggestions?
>
Do you really, really need that loop and chunk...?!


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