MATLAB: New array using average row of the old array

matrix array

I have an array M(1000,1000) and i want to build a new array N(1000,1000), where each element of N has the old value minus the average of its row (in M). If the element is zero no action will be taken. Also, from the average the zeros should be excluded.

Can you help me?

thank you in advance

Best Answer

Edit

out=bsxfun(@minus,M,mean(M,2)).*not(~M)

%or

idx=M==0;
out=bsxfun(@minus,M,mean(M,2));
out(idx)=0

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MATLAB: The sum of positive elements of a matrix

sum(sum(M(M > 0)))

MATLAB: Can someone explain me how to make this loop efficiently

I think the key is coming up with an expression that gives you the index for someArray from the current loop index. Something like this:

randomNumber1 = 100;
randomNumber2 = 150;
out(1)= 0;
B = 4;
for idx = 2:1:numel(A)
    k = ceil(idx/4); % index into someArray
    ArrayValue = SomeArray(k);
    if % first condition
        out(idx) = ((out(idx - 1)) - randomNumber1);
    elseif % second condition
        out(idx) = ((out(idx - 1)) - randomNumber2);
    elseif % third condition
        out(idx) = (out(idx - 1) + ArrayValue);
    end
end

Best Answer

Related Solutions

MATLAB: The sum of positive elements of a matrix

MATLAB: Can someone explain me how to make this loop efficiently

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