Extracting every n number of column from matrix matlab
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Aybars
am 3 Mai 2018
Kommentiert: Ameer Hamza
am 16 Aug. 2018
0 down vote favorite I need to extract every n number of column from my matrix. Please note that not every nth column. For example I have a matrix:
A =
1 23 34 53 67 45 67 45
12 34 45 56 67 87 98 12
1 2 3 45 56 76 87 56
And I want to extract each 3 column, so my data should be like:
X =
1 23 34 67 45 67
12 34 45 67 87 98
1 2 3 56 76 87
So I would skip 4th column then 8th column and so on. I know how to extract every nth column and row but I couldn't figure it out what I need. Appreciated for your help
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Ameer Hamza
am 3 Mai 2018
Bearbeitet: Ameer Hamza
am 3 Mai 2018
Here is a general solution to your problem in which you can specify how many columns to keep and how many to delete
colToKeep = 2;
colToDelete = 3;
ColIndex = mod( 0:size(A,2)-1, colToKeep+colToDelete ) < colToKeep;
A(:, ~ColIndex) = [];
Use colToKeep and colToDelete to specify the values.
6 Kommentare
Ameer Hamza
am 16 Aug. 2018
Just take the transpose of the matrix and apply the same method. At the end take the transpose again to get the correct matrix.
Weitere Antworten (2)
Yuvaraj Venkataswamy
am 3 Mai 2018
Bearbeitet: Yuvaraj Venkataswamy
am 3 Mai 2018
Answer is below where A is a your matrix.
if true
n=4;
A =[1 23 34 53 67 45 67 45
12 34 45 56 67 87 98 12
1 2 3 45 56 76 87 56]
A(:,n:n:end) =[]
end
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