How to change matrix numbers positions

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Hugo Matias
Hugo Matias 2018-11-30
评论： Bruno Luong 2018-11-30
I have a matrix generated randomly and I want to change the positions of the numbers
i.e:
X=[2 3 4 5;
7 8 9 1]
to
X=[9 5 1 3;
5 2 8 2]
(I'm the one who chooses the new positions, not random)

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回答（3 个）

Georgios Pyrgiotakis
do you mean that you want to randomly reanrage the array?
Image Analyst
Image Analyst 2018-11-30
Will this work for you?
X = [2 3 4 5;
7 8 9 1]
[rows, columns] = size(X)
X = X(randperm(numel(X))) % Unfortunately reshapes into a row vector.
X = reshape(X, [rows, columns]) % Put back into 2-D
It rearranges elements into a random order.
  2 个评论
Hugo Matias
Hugo Matias 2018-11-30
No, i'm the one who chooses the new positions!
Image Analyst
Image Analyst 2018-11-30
What form do you have your new positions in? A matrix? A vector? Two vectors or two matrices with new rows in one, and new columns in the other? Come on, make it EASY for us to help you, not hard.

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Bruno Luong
Bruno Luong 2018-11-30
X(randperm(numel(X))) = X
  4 个评论
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Hugo Matias
Hugo Matias 2018-11-30
How would I do if I wanted to to change the position of the number at (1,2) to (2,3) , for example?

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