R help - Feb 2008 - Split a matrix for mixture distribution

Hello,
 I have a matrix with 4000 rows and 8 columns with 1 and zeros 
Every 1000 rows comes for a different rule, f1,f2,f3,f4.

1 1 1 1 0 0 0 0
1 1 1 1 0 0 0 0 
....
0 0 0 0 1 1 1 1
0 0 0 0 1 1 1 1
...
1 1 0 0 1 1 0 0
1 1 0 0 1 1 0 0
...
0 0 1 1 0 0 1 1 
0 0 1 1 0 0 1 1

How can I extract 4 matrices each one containes 1000 elements from a certain
rule,since i want to 
a) choose between f1, f2, f3 and f4 at random according to the
   probabilities p1, p2, p3 ,p4 (it is assumed p1+p2+p3=1).
b) sample 1 value from whichever of f1, f2, f3 ,f4 was chosen

Thanks a lot
Evgenia
 
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Evgenia wrote:
> Hello,
>  I have a matrix with 4000 rows and 8 columns with 1 and zeros 
> Every 1000 rows comes for a different rule, f1,f2,f3,f4.
> 
> 1 1 1 1 0 0 0 0
> 1 1 1 1 0 0 0 0 
> ....
> 0 0 0 0 1 1 1 1
> 0 0 0 0 1 1 1 1
> ...
> 1 1 0 0 1 1 0 0
> 1 1 0 0 1 1 0 0
> ...
> 0 0 1 1 0 0 1 1 
> 0 0 1 1 0 0 1 1
> 
> How can I extract 4 matrices each one containes 1000 elements from a
certain
> rule,since i want to 
> a) choose between f1, f2, f3 and f4 at random according to the
>    probabilities p1, p2, p3 ,p4 (it is assumed p1+p2+p3=1).
> b) sample 1 value from whichever of f1, f2, f3 ,f4 was chosen
I guess we need some better explanations or examples - at least I do not 
understand your aims.

Uwe Ligges
> Thanks a lot
> Evgenia
>

Hi,I am wondering how to conduct Kenward-Roger correction in 
the linear mixed model using R. Any idea?

Thanks a lot,

Suyan