Matlab - ordenar una matirz o un vector de n*m con respecto a una columna

clear

a=[ 4, 26

    2, 14

    7, 18

    12, 22

    2, 3

    12, 13

    4, 6

    7, 1

    2, 15]

n=size(a,1);

for i=1:n

    for j=1:n-i

      if a(j,1)>a(j+1,1)

        aux=a(j,:);

        a(j,:)=a(j+1,:);

        a(j+1,:)=aux;

      end

    end

end

 a

>> ordenar_respecto_a_una_columna

a =

     4    26

     2    14

     7    18

    12    22

     2     3

    12    13

     4     6

     7     1

     2    15

a =

     2    14

     2     3

     2    15

     4    26

     4     6

     7    18

     7     1

    12    22

    12    13

data = randi(20, 6, 2)

[~, i] = sort(data(:,1))

data(i, :)

data =

    11     9

     3     2

    18     5

    13     3

     8     4

    11     5

i =

     2

     5

     1

     6

     4

     3

ans =

     3     2

     8     4

    11     9

    11     5

    13     3

    18     5

[~, i] = sort(data(:,1), 'desc')