filtering logical array

[seektime]

Hi, suppose you have a logical array such as 

> a=[0 0 1 1 1 1 1 0 1 0 1 0 0 1 0 0 1 1 0 0 0 0 0 1 1 1 0]; 

I'd like to filter this vector so it looks like this: 

> a 
 a=[0 0 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 0]; 

So consecutive 1's of 3 or more remain in the output while all other 1's are
set to false. 

Any help is highly appreciated. 

Thanks, 
Michael 


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