How to find the position of a row in an array

If I have an array like this

R=[1 0 1 1 1;
   1 1 0 1 0; 
   1 0 1 1 0; 
   0 1 0 1 1; 
   0 0 1 0 1];

I want to find the position of S in R.

S=[1 0 1 1 0];

Is there a function which takes S as an input and returns me its position in R which is the 3rd row

Answer 1

[JESUS DAVID ARIZA ROYETH]

rows=find(all(R==S,2))

Answer 2

[Stephen23]

>> [~,Y] = ismember(S,R,'rows')
Y =  3

[Cantor Set]

but what if S exists in 2 different rows:

R=[1 1 1; 1 1 1; 2 2 2];
[~,Y] = ismember(S,R,'rows')
Y=1

can it be refiend so that it returns Y=[1 2] ?