how can enlarge a matrix?

Question

jack nn 2015-6-3

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https://ww2.mathworks.cn/matlabcentral/answers/222194-how-can-enlarge-a-matrix

评论： jack nn 2015-6-4

hi I have some matrixes that I want to resize these in a way that every element repeated in a 5*5 Square for example: m=[1,2;3,4] and I want to my result be this:

   1     1     1     1     2     2     2     2     2
   1     1     1     1     2     2     2     2     2
   1     1     1     1     2     2     2     2     2
   1     1     1     1     2     2     2     2     2
   1     1     1     1     2     2     2     2     2
   3     3     3     3     4     4     4     4     4
   3     3     3     3     4     4     4     4     4
   3     3     3     3     4     4     4     4     4
   3     3     3     3     4     4     4     4     4
   3     3     3     3     4     4     4     4     4

..... I searched but imresize and reshape can not do this for me.Is there any way?

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Answer 1

Stephen23 2015-6-3

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https://ww2.mathworks.cn/matlabcentral/answers/222194-how-can-enlarge-a-matrix#answer_181413

编辑：Stephen23 2015-6-3

在 MATLAB Online 中打开

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     2     2     2     2     2
   1     1     1     1     2     2     2     2     2
   1     1     1     1     2     2     2     2     2
   1     1     1     1     2     2     2     2     2
   1     1     1     1     2     2     2     2     2
   3     3     3     3     4     4     4     4     4
   3     3     3     3     4     4     4     4     4
   3     3     3     3     4     4     4     4     4
   3     3     3     3     4     4     4     4     4
   3     3     3     3     4     4     4     4     4