Insert Zeros in every n-rows at the regular interval in 3rd dimension for an existing 3D Matrix.

Question

Sunil Oulkar 2018-4-24

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/396966-insert-zeros-in-every-n-rows-at-the-regular-interval-in-3rd-dimension-for-an-existing-3d-matrix

编辑： Matt J 2018-4-24

I have a m*n*t matrix. In 3rd dimension t, I want to insert m*n zeros at a particular interval. For example input

 A(:,:,1) =
   8    -8    -3
    -3    -3     7     8
    -3   -10    -1     8
   5   -10   -10
   7    11    13
A(:,:,2) =
   9     7     5
   5     2    11
  12    15     8
  10     9     5
   4    15    13
A(:,:,3) =
  17    17    15
  21    21    19
  21    17    17
  21    18    13
  16    13    17
A(:,:,4) =
  21    15    19
  12    20    11
   5     4     9
   6    15    16
   2    17    10

result would be:

 A(:,:,1) =
   8    -8    -3
    -3    -3     7     8
    -3   -10    -1     8
   5   -10   -10
   7    11    13
A(:,:,2) =
   9     7     5
   5     2    11
  12    15     8
  10     9     5
   4    15    13
A(:,:,3) =
   0     0     0
   0     0     0
   0     0     0
   0     0     0
   0     0     0
A(:,:,4) =
   0     0     0
   0     0     0
   0     0     0
   0     0     0
   0     0     0
A(:,:,5) =
  17    17    15
  21    21    19
  21    17    17
  21    18    13
  16    13    17
A(:,:,6) =
  21    15    19
  12    20    11
   5     4     9
   6    15    16
   2    17    10
A(:,:,7) =
   0     0     0
   0     0     0
   0     0     0
   0     0     0
   0     0     0
A(:,:,8) =
   0     0     0
   0     0     0
   0     0     0
   0     0     0
   0     0     0

Thanks!

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Stephen23 2018-4-24

@Sunil Oulkar: I am impressed: how did you manage to define an array with four rows in the first page, six rows in the second page, and five rows in the third and fourth pages?

Sunil Oulkar 2018-4-24

Sorry I made a mistake. I’ve corrected it now.

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Answer 1

Matt J 2018-4-24

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/396966-insert-zeros-in-every-n-rows-at-the-regular-interval-in-3rd-dimension-for-an-existing-3d-matrix#answer_316848

编辑：Matt J 2018-4-24

在 MATLAB Online 中打开

Assuming every page really is m x n (cf. Stephen's comment),

   A=rand(3,4,6); %fake data
pattern=[1 1 1 0 0];  %insert zero every 4th and 5th page
[m,n,t]=size(A);
q=floor(t/nnz(pattern));
idx=repmat( reshape(pattern,1,1,[]) , 1,1,q)& true(m,n);
out=zeros(size(idx));
out(idx)=A(1:nnz(idx)),

results in

out(:,:,1) =
      0.8147    0.9134    0.2785    0.9649
      0.9058    0.6324    0.5469    0.1576
      0.1270    0.0975    0.9575    0.9706
out(:,:,2) =
      0.9572    0.1419    0.7922    0.0357
      0.4854    0.4218    0.9595    0.8491
      0.8003    0.9157    0.6557    0.9340
out(:,:,3) =
      0.6787    0.3922    0.7060    0.0462
      0.7577    0.6555    0.0318    0.0971
      0.7431    0.1712    0.2769    0.8235
out(:,:,4) =
       0     0     0     0
       0     0     0     0
       0     0     0     0
out(:,:,5) =
       0     0     0     0
       0     0     0     0
       0     0     0     0
out(:,:,6) =
      0.6948    0.0344    0.7655    0.4898
      0.3171    0.4387    0.7952    0.4456
      0.9502    0.3816    0.1869    0.6463
out(:,:,7) =
      0.7094    0.6797    0.1190    0.3404
      0.7547    0.6551    0.4984    0.5853
      0.2760    0.1626    0.9597    0.2238
out(:,:,8) =
      0.7513    0.6991    0.5472    0.2575
      0.2551    0.8909    0.1386    0.8407
      0.5060    0.9593    0.1493    0.2543
out(:,:,9) =
       0     0     0     0
       0     0     0     0
       0     0     0     0
out(:,:,10) =
       0     0     0     0
       0     0     0     0
       0     0     0     0