[R] How to convert matrix with frequency & variable to vector?

[David Winsemius]

On Jul 8, 2011, at 12:24 AM, nanthinee wrote:

> Hi,
>
> I have a dataset:
>
>  freq   x
> 1  30    7
> 3  70    8
> 4  100  7
> 5  22    6
> 6  250  10

perhaps (untested):

c( apply(ds,1,function(x) rep(x[2], x[1]) ) )

also perhaps (since I think rep is vectorised):

rep(ds$x, ds$freq)

>
> How do I convert into vector form (v<- 7,7,7,8,8,8,6,6,6,6) all "x"  
> with the
> complete frequency? Transpose only does a single row but I want the  
> full
> frequencies not just the variable transposed.
>
> Thanks,
> Nanthinee
>
>
> --
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David Winsemius, MD
West Hartford, CT