MATLAB: How to delete a row from the matrix?

Suppose if I have a matrix as:

 san = [ 1 2 3; 4 5 6; 7 8 9; 10 11 12; 13 14 15]

if I want to delete second row and all of its column then ow can I do this??

san(2,:) = []

Don't use q1, q2, q3. Use the following. You can reference it using q{1},q{2},q{3}. Even further, q{1}(2), q{3}(4).

a=[1 2 3;4 5 6;7 8 9;10 11 12]; 
q=cell(size(a,2),1);
for i = 1 : size(a, 2) 
    q{i} = a(:,i); 
end

Assuming A and B have the same number of columns,

AB = [A;B]; 
C = [unique(AB(:,1)), splitapply(@(x) sum(x,1), AB(:,2:end), AB(:,1))];

Result:

C =
     1    13    17    18
     2    14     9     4
     3    14    14     9
     4     5     6     2