MATLAB: +/- signs when coding coding How to type in v1 = +/- w2/((w3^2)+(w2^2)) and v2 = +/- w3/((w3^2)+(w2^2))? The problem is that the vectors can be both positive and negative Best Answer The answer is in your duplicate question: https://www.mathworks.com/matlabcentral/answers/491439-error-when-trying-to-modify-a-code-vectors#answer_401831 Related SolutionsMATLAB: “plus/minus” sign operator It depends what you want to do with it.M = [1 1 1; 1 1 -1; 1 -1 1; 1 -1 -1; -1 1 1; -1 1 -1; -1 -1 1; -1 -1 -1];Out = (M * Row')' ;Each row of Out is what you want.You might want to programatically generate M if you have more columns on your row. MATLAB: Identify pre-sign changes I'm not sure to get your problem.something like% here changes of sign appear at positions : 3,4,5 and 8x1 = [1 1 -1 1 -1 -1 -1 1];% find changesMySignChangingIndex = find(x1(1:end-1)~=x1(2:end))+1; % gives MySignChangingIndex = [3 4 5 8];% calculates xx2xx2 = zeros(size(price));xx2(MySignChangingIndex) = price(MySignChangingIndex); Related QuestionHow to change sign of matrixHeaviside and sign functionFind for sign changesSigns in the output.Matching two matrices by sign
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