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

Question

Sunil Oulkar am 24 Apr. 2018

1
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https://de.mathworks.com/matlabcentral/answers/396966-insert-zeros-in-every-n-rows-at-the-regular-interval-in-3rd-dimension-for-an-existing-3d-matrix

Bearbeitet: Matt J am 24 Apr. 2018

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 am 24 Apr. 2018

@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 am 24 Apr. 2018

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

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Answer 1

Matt J am 24 Apr. 2018

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Direkter Link zu dieser Antwort

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

Bearbeitet: Matt J am 24 Apr. 2018

In MATLAB Online öffnen

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