# how to order a matrix?

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Sky Scrapper el 30 de Nov. de 2018
Comentada: Sky Scrapper el 3 de Dic. de 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).
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Andrei Bobrov el 30 de Nov. de 2018
Editada: Andrei Bobrov el 1 de Dic. de 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
>>
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Andrei Bobrov el 3 de Dic. de 2018
A = [ -3380.5 1 -1 1 0 0 0 0
-6760.7 0 -1 0 0 1 0 0
-3380.4 -1 0 -1 0 1 1 0
-3380.4 -1 0 -1 1 0 0 0
-6760.7 0 -1 0 0 0 1 0
-3380.5 -1 -1 1 1 0 1 0
-6760.7 0 -1 0 1 0 1 1
-3380.4 -1 0 -1 0 0 0 1
3380.2 1 0 1 0 1 0 1];
[~,b] = unique(A(:,1:4),'rows');
B = A(b,:);
B([false;diff(B(:,1))==0],1) = nan;
Sky Scrapper el 3 de Dic. de 2018
it's working properly. Thanks!

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