MATLAB: How to order a matrix

matrix

hi,
Say, I have a matrix,
A B C D
-6760,691 0 -1 0
-3380,495 1 -1 1
-6760,691 0 -1 0
-3380,395 -1 0 -1
-3380,395 -1 0 -1
-6760,691 0 -1 0
-3380,495 -1 -1 1
-6760,691 0 -1 0
-3380,395 -1 0 -1
3380,195 1 0 1
And I want to get,
A B C D
-6760,691 0 -1 0
-3380,495 1 -1 1
-1 -1 1
-3380.395 -1 0 -1
3380,195 1 0 1
Here, I need to order the unique values of A which is done on the 1st column. I'll have to write the different patterns of B, C, D on the basis of same value of A. And, if there is any more repeated values of B,C,D for the same value of A, i'll have to keep only 1 pattern (row).
Can anyone please help me?

Best Answer

EDIT
>> B = [-3380.5            1           -1            1
      -6760.7            0           -1            0
      -3380.4           -1            0           -1
      -3380.4           -1            0           -1
      -6760.7            0           -1            0
      -3380.5           -1           -1            1
      -6760.7            0           -1            0
      -3380.4           -1            0           -1
       3380.2            1            0            1];
>> A = unique(B,'rows')
A =
      -6760.7            0           -1            0
      -3380.5           -1           -1            1
      -3380.5            1           -1            1
      -3380.4           -1            0           -1
       3380.2            1            0            1
>> A([false;diff(A(:,1)) == 0],1) = nan
A =
      -6760.7            0           -1            0
      -3380.5           -1           -1            1
          NaN            1           -1            1
      -3380.4           -1            0           -1
       3380.2            1            0            1
>>
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