How can I delete even rows in a matlab Matrix

Question

Mehdi Jaiem 2020-11-23

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/658548-how-can-i-delete-even-rows-in-a-matlab-matrix

评论： Mehdi Jaiem 2020-11-23

采纳的回答： Stephan

在 MATLAB Online 中打开

Hello

My Idea consists in deleting every row with an even index (I wanted to test something).

But this code does not seem to work.

I get the error " Matrix index is out of range for deletion. "

Thank you

Y=magic(10)
%T = Y (1:2:end , 1:3:end );
T=Y
[a,b]=size(T);
for i = 1:a
r=rem(i,2);
   if (r == 0)
   T(i, :)=[];
   end
T
end

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Answer 1

Stephan 2020-11-23

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https://ww2.mathworks.cn/matlabcentral/answers/658548-how-can-i-delete-even-rows-in-a-matlab-matrix#answer_552998

编辑：Stephan 2020-11-23

在 MATLAB Online 中打开

>> A = [1 2 3; 4 5 6; 7 8 9; 0 -1 -2]
A =
     1     2     3
     4     5     6
     7     8     9
     0    -1    -2
>> A(2:2:end,:) = []
A =
     1     2     3
     7     8     9

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Stephan 2020-11-23

在 MATLAB Online 中打开

A(:, 1:3:end) = [];

will delete every third column without copying te wanted ones. If you dont want to use this syntax you have to use a loop - but why should you do this?

Mehdi Jaiem 2020-11-23