Selecting Every Other Element in a Matrix
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How can I select every other element in a matrix, such as A=[1 2 8 7 6 5 4 6]?
采纳的回答
Star Strider
2015-2-16
I’m not certain what you want, so I’ll venture two possibilities:
A=[1 2 8 7 6 5 4 6];
Aodd = A(1:2:end); % Odd-Indexed Elements
Aeven = A(2:2:end); % Even-Indexed Elements
7 个评论
Dewey Phillips
2017-1-26
this worked for me
Aditya Kansal
2018-7-30
i want to do the same for a 2-D array, how can i achieve that?
Nitai Fingerhut
2018-12-25
A=[1 2 8; 7 6 5; 4 6 9];
A= A(:);
Aodd = A(1:2:end); % Odd-Indexed Elements
Aeven = A(2:2:end); % Even-Indexed Elements
at the end use reshpae to make it 2D again
"i want to do the same for a 2-D array, how can i achieve that?"
A(1:2:end,:) % odd rows
A(2:2:end,:) % even rows
A(:,1:2:end) % odd columns
A(:,2:2:end) % even columns
Very basic concepts, such as how to use indexing, are explained in the introductory tutorials:
Khyati Jain
2019-7-4
How do you do this if it is a complex vector?
Atas Jyoti Kaibarta
2022-1-21
only for real number
Star Strider
2024-2-8
It should work the same way for complex vectors, however the problem with that is that it could select only one of a complex pair. One way to correct for that would be to use the conj function to complete the pair after selecting them, then use the cplxpair function.
You would need to decide whether you wanted to select from complex vectors to begin with. The problems that could cause might not be worth the efffort.
更多回答（1 个）
prashanth GT
2020-3-2
0 个投票
function y = everyOther(x)
y = x(1:2:length(x));
end
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