I do not know what do you mean by consecutive values. You mean 1,2,3,4,5,6,7... consecutive? Or 1,1,1,1,1,1,1.. consecutive?
You can try:-
temp = data - threshold;
position = find(temp>0);
That is if you are going for positions of data greater than a threshold value. If it is case B of consecutive values then you are done. If you are looking for a pattern, manipulate the position data you found.