help in multi dimensional array 3D

2017 1 17
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更新时间：2017 1 18
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hi I'm trying to increase the third dimension in a three-dimensional matrix can you help me? Example a=(2,3,5) after iteration it must be a=(2,3,7) thanks

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Greg
Greg 2017-1-17
编辑：Greg 2017-1-17

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I assume that "a=(2,3,5)" means the corresponding length of each dimension of a is 2, 3 and 5.
Increasing variable size is rarely a good idea (there are plenty of articles on pre-allocation; I won't rehash).
a = zeros(2,3,7);
for ind3 = 1:7
a(:,:,ind3) = randi(10,2,3);
end
(But ALL of this trivial example can be done with "a = randi(10,2,3,7);")
If you really MUST dynamically allocate:
  • a(:,:,end+1) = randi(10,2,3); ~OR~
  • a = cat(3,a,randi(10,2,3));

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