MATLAB: Select several groups in a Vector

select some value in a vector

Hi all
I have a vector like this:
x=[0 0 0 1 1 1 0 0 1 1 0 1 1 1 0 0 0 0 1 1 1 1]
I'm trying to save each part of ones in a Row. for instance, the result of this vector should be a matrix with 4 rows.
1th row = 1 1 1
2th row = 1 1
3rd row = 1 1 1
4th row = 1 1 1 1
how can I do that automatically with a loop.
could you please help me.
Cheers

Best Answer

Method one: diff and arrayfun:
>> x = [0 0 0 1 1 1 0 0 1 1 0 1 1 1 0 0 0 0 1 1 1 1];
>> d = diff([0,x,0]);
>> C = arrayfun(@(b,e)x(b:e-1),find(d>0),find(d<0),'uni',0);
>> C{:}
ans =
   1   1   1
ans =
   1   1
ans =
   1   1   1
ans =
   1   1   1   1
Method two: regexp and cellfun:
>> C = regexp(char(x),sprintf('\1+'),'match');
>> C = cellfun(@double,C,'uni',0);
>> C{:}
ans =
   1   1   1
ans =
   1   1
ans =
   1   1   1
ans =
   1   1   1   1
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