MATLAB: Inserting into certain locations in array

inserting arraysMATLABmatrix arraymatrix manipulation

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

B = [ 10 20 30]

C= 3 % is the position where I want to insert B in A

I = 2 % is the number of times or multiple

output must be:

F = [ 1 2 3 10 20 30 4 5 6 10 20 30 7 8 9 10 11 12 13 14 15]

if C= 2 and I = 4

then, F = [ 1 2 10 20 30 3 4 10 20 30 5 6 10 20 30 7 8 10 20 30 9 10 11 12 13 14 15]

F = A;
for i = 1:I
    F = [F(1:C*i+length(B)*(i-1)),B,F(C*i+length(B)*(i-1)+1:end)];
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

c = [max(a) max(b)];