# Adding matrices to a 3D matrix in a specific order

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Robert am 3 Nov. 2015
Bearbeitet: Stephen23 am 3 Nov. 2015
Say I have a 3D matrix 50x50x100
Now I want to add another matrix to make it 50x50x101, however I want the new matrix to go in a particular position e.g. the 10th out of the 101 matrices.
How can I achieve this?
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### Antworten (1)

Stephen23 am 3 Nov. 2015
Bearbeitet: Stephen23 am 3 Nov. 2015
This is easy using MATLAB indexing. Here is an example with 2D matrices, to show how indexing can be used to insert values in particular locations of a new matrix:
>> M = [1,2,3;4,5,6] % original matrix
M =
1 2 3
4 5 6
>> N(:,[1,3:4]) = M % insert M into cols 1,3 and 4 of N
N =
1 0 2 3
4 0 5 6
>> N(:,2) = [Inf,NaN] % insert into col 2 of N
N =
1 Inf 2 3
4 NaN 5 6
And here is a 3D example as well:
>> X = reshape([1,2,3,4,5,6],1,2,3); % original array
>> Y(:,:,[1,3:4]) = X; % insert into pages 1, 3 and 4 of Y
>> Y(:,:,2) = [Inf,NaN] % insert into page 2 of Y
Y(:,:,1) =
1 2
Y(:,:,2) =
Inf NaN
Y(:,:,3) =
3 4
Y(:,:,4) =
5 6
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