MATLAB: How to arrange ascending order only one column of a matrix

arrayascendingmatrix

Let's say, I have a=[25 10 85 35 71; 1 2 3 4 5] and output shout come b=[10 25 35 71 85; 2 1 4 5 3]

Best Answer

b=sortrows(a.').'

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MATLAB: Matrix problem for same values of column

N = size(A,1);
X = ones(N,1); % group numbers
Z = true(N,1); % logical index
V = 1; % group number
for k = 2:N % for each row...
    Y = A(k,2)==A(1:k-1,3); % check if any matching rows.
    if any(Y)
        X(k) = X(Y); % copy group number (assumed scalar).
        W = X(k)==X(1:k-1); % logical index of that group.
        if all(A(k,1)>A(W,1))
            Z(W) = false; % current val > prev vals.
        else
            Z(k) = false; %  prev val > current val.
        end
    else % no matching rows:
        V = V+1; % increment group number.
        X(k) = V;
    end
end
B = A(Z,:) % output matrix

Giving:

B =
        22.98            4           12
        25.53           26           29
        21.43            2           32
        29.94           11           33
        29.57           15           35
        13.69           37           38
        26.97           28           39
         4.24           18           42
        29.93           16           45
        25.83           30           46
        26.09           40           47
        28.61           41           49
        29.41           48           50

MATLAB: Sort a line of the matrix and change the other lines according the line sorted

Use sortrows.

a = a'; % transpose your matrix
asorted = sortrows(a,1); % sort by first column (row)
asorted = asorted'; % de-transpose your matrix

You can combine all that code into one line:

asorted = sortrows(a')';

Best Answer

Related Solutions

MATLAB: Matrix problem for same values of column

MATLAB: Sort a line of the matrix and change the other lines according the line sorted

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