finding the position of values in a matrix

i have set

X=[

12 14

1 2

12 4

6 14

12 18

12 4

1 2]

Y=[

1 2

1 2

6 14

12 4]

can i get the position of Y elements in X matrix as the number are repeated its hard for me to find using code normal code. can any one please help me.

Answer 1

[galaxy]

Try

[~,idx]=setdiff(X,Y,'rows');
idx_rows=setdiff(1:size(X,1),idx);

idx_rows =

     2     3     4     6     7

[sampath kumar punna]

sorry, i have only 4 rows in my Y matrix how can i get 5 postions

[galaxy]

because X and Y array has same value, if you want to find only one, you need use unique function

[sampath kumar punna]

yes X and Y have same values but Y is not having all values of X only few values are in Y, so for those some values in Y, what is the position in X.