matrix

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khalil
khalil 2012-4-19
how I can remove rows from matrix each elements in these rows are equals m=[1 2 3;1 1 1;4 5 8;4 5 8;1 1 1;1 1 1;1 1 1;1 1 1;1 1 1;1 1 1;1 1 1;1 1 1;4 5 8;7 8 5; 47 9 5;7 8 5;5 322 5;7 8 55];

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Andrei Bobrov
Andrei Bobrov 2012-4-19
m=[1 2 3;1 1 1;4 5 8;4 5 8;1 1 1;1 1 1;1 1 1;1 1 1;1 1 1;1 1 1;1 1 1;1 1 1;4 5 8;7 8 5; 47 9 5;7 8 5;5 322 5;7 8 55];
variant 1
[a b n] = unique(m,'rows','first');
[id id] = sort(b);
out1 = a(id,:);
variant 2
[a b n] = unique(m,'rows','first');
[id id] = sort(b);
t = accumarray(n,ones(numel(n),1)) == 1;
a2 = a(id,:);
out2 = a2(t(id),:);
  1 个评论
khalil
khalil 2012-4-19
Thank you.
The first variant is good solution for me

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更多回答（2 个）

Geoff
Geoff 2012-4-19
m(row, :) = [];
Where row is the row index, or vector of row indices.
Jan
Jan 2012-4-19
I do not understand the question. What does "each element in the rows are equals" mean? Do you want to remove rows, which have have equal elements only? Then:
m = [1 2 3;1 1 1;4 5 8;4 5 8;1 1 1;1 1 1;1 1 1;1 1 1; ...
1 1 1;1 1 1;1 1 1;1 1 1;4 5 8;7 8 5; 47 9 5; ...
7 8 5;5 322 5;7 8 55];
m = m(any(diff(m, 1, 2), 2), :);

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