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

3 vues (au cours des 30 derniers jours)
Sunil Oulkar
Sunil Oulkar le 24 Avr 2018
Modifié(e) : Matt J le 24 Avr 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) =
9 8 -8 -3
-3 -3 7 8
-3 -10 -1 8
10 5 -10 -10
4 7 11 13
A(:,:,2) =
14 9 7 5
3 5 2 11
15 12 15 8
7 10 9 5
14 4 15 13
A(:,:,3) =
14 17 17 15
13 21 21 19
15 21 17 17
14 21 18 13
17 16 13 17
A(:,:,4) =
14 21 15 19
15 12 20 11
15 5 4 9
7 6 15 16
3 2 17 10
result would be:
A(:,:,1) =
9 8 -8 -3
-3 -3 7 8
-3 -10 -1 8
10 5 -10 -10
4 7 11 13
A(:,:,2) =
14 9 7 5
3 5 2 11
15 12 15 8
7 10 9 5
14 4 15 13
A(:,:,3) =
0 0 0 0
0 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 0
0 0 0 0
A(:,:,5) =
14 17 17 15
13 21 21 19
15 21 17 17
14 21 18 13
17 16 13 17
A(:,:,6) =
14 21 15 19
15 12 20 11
15 5 4 9
7 6 15 16
3 2 17 10
A(:,:,7) =
0 0 0 0
0 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 0
0 0 0 0
Thanks!
  2 commentaires
Stephen23
Stephen23 le 24 Avr 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
Sunil Oulkar le 24 Avr 2018
Sorry I made a mistake. I’ve corrected it now.

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Réponse acceptée

Matt J
Matt J le 24 Avr 2018
Modifié(e) : Matt J le 24 Avr 2018
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

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