function n=r2(m,a,b)
%r2(Matrix,a,b) takes a matrix and swaps row a with row b
l=m;
c=size(l);

for i=1:c(2)
    d=l(a,i);
    l(a,i)=l(b,i);
    l(b,i)=d;
end

n=l;