MATLAB: How to do division on matrices

divisionmatrix

[a b; c d]*[x;y]=[k;l]

How can i calculate x and y if I know a,b,c,d and k,l ?

inv([a b; c d])*[k;l]

d        = [zeros(1, 30000); diff(r)];
index    = (d < -109);
r(index) = r(index) + 300;
index    = (d > 180);
r(index) = r(index) - 300;

Or:

d     = [zeros(1, 30000); diff(r)];
shift = zeros(size(r));
shift(d < -109) =  300;
shift(d >  180) = -300;
r     = r + shift;

Your function inv is erased by the variable inv

inv=inv(D+aL)

change it to

inv1=inv(D+al)