Cut differently odd and even rows in matrix

Question

Sergey Makovkin 2016-11-21

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/313266-cut-differently-odd-and-even-rows-in-matrix

编辑： Alexandra Harkai 2016-11-21

采纳的回答： Alexandra Harkai

在 MATLAB Online 中打开

Hi, all!

I have a matrix like that:

a = [ 1     2     3     4     5     6     7     8;
  10    11    12    13    14    15    16;
  18    19    20    21    22    23    24;
  26    27    28    29    30    31    32];

I need to get this matrix:

 [ 3     4     5     6     7     8;
  10    11    12    13    14;
  20    21    22    23    24;
  26    27    28    29    30];

I want to cut first two values in odd lines and cut last two values in even lines. I means that I need something like this:

a = a(3:8, 1:2:end) && a(1:6, 2:2:end)

But it is incorrect. How can I do it correctly?

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Answer 1

Alexandra Harkai 2016-11-21

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/313266-cut-differently-odd-and-even-rows-in-matrix#answer_244115

编辑：Alexandra Harkai 2016-11-21

在 MATLAB Online 中打开

n = size(a, 2); % number of columns
a(1:2:n,:) = a(1:2:n,[[3:n],[1:2]]); % move first 2 elements in odd rows to the end
a = a(:, 1:n-2); % get rid of last 2 columns

Of course prettier to use circshift:

n = size(a, 2); % number of columns
a(1:2:n,:) = circshift(a(1:2:n,:),-2,2); % move first 2 elements in odd rows to the end
a = a(:, 1:n-2); % get rid of last 2 columns