# how to order a matrix?

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Sky Scrapper on 30 Nov 2018
Commented: Sky Scrapper on 3 Dec 2018
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).

Andrei Bobrov on 30 Nov 2018
Edited: Andrei Bobrov on 1 Dec 2018
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
>>
Sky Scrapper on 3 Dec 2018
it's working properly. Thanks!

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