MATLAB: How to get the unique and NON-ZERO rows of a matrix

matrixmatrix manipulation

Dear Experts,

I do not know how to get the unique and non-zero rows of a matrix, can you help me to figure it out please?

For example,

a = [1 2 3
     0 0 0
     2 4 6]

While the following command gives me the unique rows but it includes the Zero rows as well that I do not want to have in my desired output

unique(a,'rows')

my desired output has to be as :

   [1 2 3
    2 4 6]

thanks for helps.

Best Answer

I guess I find it out!!

   unique(a(all(a,2),:),'rows')

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MATLAB: Non-zero column value

Try eye(), any(), and find():

A=[1,0,0,0;0,1,1,1;0,0,1,0;0,0,1,1]
diagonalElements = logical(eye(length(A)))
% Make copy of A so we don't change 
% the original A (which could be bad).
Acopy = A;
% Set diagonal elements = 0.
Acopy(diagonalElements) = 0
rowsWith1s = find(any(Acopy, 2))

MATLAB: Hello, can any one help me out? I have an mxn matrix with repeated columns. How to get another matrix from this very one which is having no repetition of columns. Many thanks for anticipated assistance.

Transpose your matrix, use unique with the rows option, and then transpose again:

A=[2 3 4 4 3; 1 2 4 4 2; 2 4 6 6 4]
B = unique(A.', 'rows','stable').'

Best Answer

Related Solutions

MATLAB: Non-zero column value

MATLAB: Hello, can any one help me out? I have an mxn matrix with repeated columns. How to get another matrix from this very one which is having no repetition of columns. Many thanks for anticipated assistance.

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