MATLAB: What is wrong with this loop.

jordan elimination

for k=n:n-2,
    for i=n-1:1
        m=A(i,k)/A(k,k)
        for j=n:1
            A(i,j)=A(i,j)-A(k,j)*m
        end
        b(i)=b(i)-b(k)*m
    end
end
I am trying to write a for loop code for Guess Jordan Elimination, where n=length(b) A and b are both matrices of a system of equations.
I think the problem is with k because the value of k in the workspace is []

Best Answer

To have a for-loop iterate backwards you have to specify the increment
for k=1:10 % forward
...
end
for k = 10:-1:1 % backward
...
end
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