MATLAB: Updating a matrix based on conditions in other matrixes

matrix manipulation

I have coded the attached loop to update matrix Lr but I would ideally like to use code that can achieve what the shown loop is doing in one sweep (i.e. without needing to loop); the actual matrixes I have can be extremely large.
The code is also shown below, but the layout is off:
k = 1;
pos_neg = [1;1;0];
E = [round(rand(1,3));round(rand(1,3));round(rand(1,3))];
Lr = zeros(numel(pos_neg(:,1)),numel(E(:,1)));
L = 0.5;
for i = 1:numel(E(:,1)) 
    for ii = 1:numel(E(:,1)) 
        if  sum(E(i,:)) <= k
            if  E(i,ii) == 0
                Lr(i,ii) = L;
            end
            if  E(i,ii) == 1
                Lr(i,ii) = -L;
            end    
        end
        if  sum(E(i,:)) >= k
            if  E(i,ii) == 1
                Lr(i,ii) = L;
            end
            if  E(i,ii) == 0
                Lr(i,ii) = -L;
            end    
        end
    end
end

Best Answer

If I work through the logic correctly,
Lr = L*(1 - 2 * bsxfun( @eq, sum(E,2) <= k, E));
Or if you have R2016b or later,
Lr = L*(1 - 2 * ((sum(E,2) <= k) == E));
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