MATLAB: How to change array element with another array

arrayvalue

hi all, so i have 2 array and i want to change the value of array1 to array2. for example i have:

a = [1 1 1; 1 1 1; 1 1 1]
b = [4 4; 4 4]

and i want the array to be like this :

c = [4 4 1; 4 4 1; 1 1 1]

basicaly i want 'b' to be inside 'a' and replace all element 'a' in the same position as 'b' hehe what is the simplest code for this? thanks

 a = [1 1 1; 1 1 1; 1 1 1]
b = [4 4; 4 4]
[n,m]=size(b)
a(1:n,1:m)=b

The ismember function does exactly that:

A=[1 2 3 4 5];
B=[1 3];
Out = ismember(A, B)
Out =
    1×5 logical array
     1   0   1   0   0

use function ff2n from Statistics Toolbox

out = ff2n(4)*2-1;

OR:

out = unique(nchoosek((-1).^(1:8),4),'rows');