MATLAB: How to change pairs

pairs

I have pairs of A{i}=[ai bi]. How can I change them to pairs B{i}=[bi ai]. I like to use Matlab special features in matrices.

Best Answer

% the data
  A = {[1 2], [3 4] , [5 6]}
% the insight
  help fliplr
  help cellfun
% the engine
  B = cellfun(@fliplr, A, 'un', 0)

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MATLAB: Top N values for multidimensional matrix with different N at each grid cell

Let A and B:

A= [0 1 5 10 12
 12 3 4 8 9
 4 6 8 9 0]
B = randi([3 8],3,5,15);

solution:

    t = A > 0;
    [m,n,k] = size(B);
    C = zeros(m,n);
    C0 = cumsum(sort(B,3,'descend'),3)./reshape(1:k,1,1,[]);
    [ii,jj] = ndgrid(1:m,1:n);
    C(t) = C0(sub2ind([m,n,k],ii(t),jj(t),A(t)));

MATLAB: Find slope across columns of cell

How are you organizing the data into ordered pairs? I'm assuming that by 'numerical data' you mean you have cells that contain individual doubles.

data = cell2mat(a);
for i = 1:size(a,1)
    slope(i) = polyfit(x_vals,data(i,:),1);
end

Best Answer

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MATLAB: Top N values for multidimensional matrix with different N at each grid cell

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