Matrix Reshaping 9x9 to 3x27

Question

Rahul Marwaha 2022-10-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1833653-matrix-reshaping-9x9-to-3x27

回答： RAGHUNATHRAJU DASHARATHA 2022-10-24

Hi I'm struggling with converting a computed 9 x 9 matrix into the form of a 3x27 matrix. An exmaple of the 9x9 is given below:

   1     4     7     9     1     2     4     9
   1     2     7     1     4     8     1     5
   5     8     5     4     3     6     3     5
   8     3     1     1     8     5     2     4
   9     5     3     9     4     2     2     9
   2     2     9     1     9     8     3     4
   6     6     2     7     2     6     4     2
   5     3     8     8     3     4     1     8
   1     6     5     8     2     5     9     4
A = 9×9
   8     9     8     4     5     8     2     6
   5     3     9     5     4     3     2     1
   6     7     7     1     5     6     7     3
   6     2     6     7     4     6     1     1
   8     4     6     1     4     9     9     1
   7     2     3     9     2     5     7     6
   1     2     8     5     4     1     3     7
   1     7     7     6     1     9     8     7
   6     1     2     4     6     1     5     9

I would like to take the first three values of each column and use that as the columns of the new 3x27 matrix. This would be repeated for all nine values in each column to create a matrix based off the one above to look like:

   9     7     1     8     6     4     3     6
   3     4     1     9     5     2     5     3   etc
   7     6     5     2     1     8     2     6

Any help or guidance would be much appreciated!

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Answer 1

Arif Hoq 2022-10-24

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https://ww2.mathworks.cn/matlabcentral/answers/1833653-matrix-reshaping-9x9-to-3x27#answer_1081928

在 MATLAB Online 中打开

A=[8     1     4     7     9     1     2     4     9
   1     2     7     1     4     8     1     5
   5     8     5     4     3     6     3     5
   8     3     1     1     8     5     2     4
   9     5     3     9     4     2     2     9
   2     2     9     1     9     8     3     4
   6     6     2     7     2     6     4     2
   5     3     8     8     3     4     1     8
   1     6     5     8     2     5     9     4];
output=reshape(A(:),3,[])
output = 3×27
   9     7     1     8     6     4     3     6     7     1     2     9     1     7     1     8     2     2     5     6     4     2     4     9     4     2
   3     4     1     9     5     2     5     3     7     3     8     1     9     8     4     4     3     8     2     4     1     2     1     5     9     8
   7     6     5     2     1     8     2     6     5     9     5     4     1     8     3     9     2     6     8     5     3     3     9     5     4     4

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Answer 2

RAGHUNATHRAJU DASHARATHA 2022-10-24

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https://ww2.mathworks.cn/matlabcentral/answers/1833653-matrix-reshaping-9x9-to-3x27#answer_1081938

在 MATLAB Online 中打开

As per my understanding you want to convert a 9x9 matric to 3x27 matix.

I will try to explain it using an example below

a=[8     1     4     7     9     1     2     4     9
   1     2     7     1     4     8     1     5
   5     8     5     4     3     6     3     5
   8     3     1     1     8     5     2     4
   9     5     3     9     4     2     2     9
   2     2     9     1     9     8     3     4
   6     6     2     7     2     6     4     2
   5     3     8     8     3     4     1     8
   1     6     5     8     2     5     9     4];
b=reshape(a,[3,27])
b = 3×27
   9     7     1     8     6     4     3     6     7     1     2     9     1     7     1     8     2     2     5     6     4     2     4     9     4     2
   3     4     1     9     5     2     5     3     7     3     8     1     9     8     4     4     3     8     2     4     1     2     1     5     9     8
   7     6     5     2     1     8     2     6     5     9     5     4     1     8     3     9     2     6     8     5     3     3     9     5     4     4