MATLAB: Expanding the existing Matrix

expand matrixmatrix

Hello,

I have matrix 365 x 1, how can I expand the matrix into 8760 x 1 -> (365 times 24), replacing all the newly added numbers with every 24th number.

eg: matrix [2,4,5,2,3 …. ] -> [2,2,2,2,2,…,2,2,4,4,4,…,4,4,4,…and so on).

I would be really grateful for help

Best Answer

Use repelem or kron, e.g. where V is your input vector:

Z = repelem(V,24)

Z = kron(V,ones(24,1)) % adjust to suit V's orientation.

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MATLAB: From a=[1 2 3 4] to b=[1 1 2 2 3 3 4 4]

b = repelem(a,2)

MATLAB: How can enlarge a matrix

If you have MATLAB R2015a (or more recent) then you can use repelem.

Otherwise you could try this FEX submission:

http://de.mathworks.com/matlabcentral/fileexchange/24536-expand

Or else you have to calculate it yourself, the easiest way is to use kron:

>> m = [1,2;3,4];
>> n = 5;
>> kron(m,ones(n))
ans =
     1     1     1     1     1     2     2     2     2     2
     1     1     1     1     1     2     2     2     2     2
     1     1     1     1     1     2     2     2     2     2
     1     1     1     1     1     2     2     2     2     2
     1     1     1     1     1     2     2     2     2     2
     3     3     3     3     3     4     4     4     4     4
     3     3     3     3     3     4     4     4     4     4
     3     3     3     3     3     4     4     4     4     4
     3     3     3     3     3     4     4     4     4     4
     3     3     3     3     3     4     4     4     4     4

Best Answer

Related Solutions

MATLAB: From a=[1 2 3 4] to b=[1 1 2 2 3 3 4 4]

MATLAB: How can enlarge a matrix

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