splitting large data set using if function

Hi all!

i have some very large data sets which is 4 coloumns i need to seperate the data out into individual sets. The 3rd coloumn is a repeating set and i want to split the data based upon when it resets so i now have each group of data seperated for example

coloumn 1 coloumn 2 coloumn 3 coloumn 4

1 52 1 47

17 28 2 84

24 34 1 12

i want the data so it would now be

data set 1 = 1 52 1 47 data set 2 = 24 34 1 12

17 28 2 84

sorry i have written this so poorly, any help would be much appreciated!

Answer 1

[jahanzaib ahmad]

if B is your data then C has all the sets in cell array

C={};

B=rand(10,4);

for k = 1 : length(B)

Ck =B(k,:);

C{k}=Ck;

end

[jahanzaib ahmad]

because u said its very large data i m not sure how much time it will take to make sets for each row