How to repeat a 4d vector for n times

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Saugata Bose
Saugata Bose 2019-6-6
评论： Stephen23 2019-6-6
Hi,
I have a 4d vector, W of size (1 x 1 x 8 x 100). I want to reshape the vector of size (1 x 1 x 8 x 1000) where the value of W will be copied after every 100 dimension.
Input:
W =val(:,:,1,1) = -0.0018
val(:,:,2,1) = 0.0045
... ... ... ... ... ... ... ... ...
val(:,:,8,100) = 0.0034
Output:
Then after my desired computation W turns to be like this
val(:,:,1,1) = -0.0018
val(:,:,2,1) = 0.0045
... ... ... ... ... ... ... ... ...
val(:,:,8,100) = 0.0034
val(:,:,1,101) = -0.0018
val(:,:,2,101) = 0.0045
... ... ... ... ... ... ... ... ...
val(:,:,8,200) = 0.0034
val(:,:,1,201) = -0.0018
val(:,:,2,201) = 0.0045
... ... ... ... ... ... ... ... ...
val(:,:,8,300) = 0.0034
... ... ... ... .. ... ... ... ... ...
I am thinking to do this using procedural style but I think MATLAB haas much faster way to dot this computation which I do not know. Can you please advice me in this regard?
thanks,

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Stephen23
Stephen23 2019-6-6
编辑：Stephen23 2019-6-6
Z = repmat(W,1,1,1,10)
  2 个评论
Saugata Bose
Saugata Bose 2019-6-6
@Stephen: thanks. its so simple implementation wherever I am writing a few lines of procedural code for this. Does this simple code mean that repmat copy W 10 times? in that case, what does other 1 mean here?
Stephen23
Stephen23 2019-6-6
"Does this simple code mean that repmat copy W 10 times? in that case, what does other 1 mean here?"
According to the repmat documentation: "B = repmat(A,r1,...,rN) specifies a list of scalars, r1,..,rN, that describes how copies of A are arranged in each dimension. When A has N dimensions, the size of B is size(A).*[r1...rN]. For example, repmat([1 2; 3 4],2,3) returns a 4-by-6 matrix."

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