How to make a matrix mirror another?

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Hugo Matias 2018-12-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/433220-how-to-make-a-matrix-mirror-another

评论： Star Strider 2018-12-2

采纳的回答： Star Strider

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How do I do this?

X=[4 7 1 0;
   3 0 6 8] 
Y=[32 6 4 21;
   77 89 0 2]
X(X==0)=a;

after the alteration:

X=[4 7 1 a;
   3 a 6 8]    
Y=[ 32 6 4 a;
   77  a  0  2];

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Hugo Matias 2018-12-1

My bad, fixed it

Hugo Matias 2018-12-1

I can't do it that way.

I can't do manual alterations on Y.

Y has to change exactly how X changes, automatically

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采纳的回答

Star Strider 2018-12-1

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/433220-how-to-make-a-matrix-mirror-another#answer_350009

在 MATLAB Online 中打开

Try this:

a = 42;
X=[4 7 1 0;
   3 0 6 8] 
Y=[32 6 4 21;
   77 89 0 2]
Idx = X==0
X(Idx) = a
Y(Idx) = a                         % Use The Same Index On Both Matrices,

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Hugo Matias 2018-12-1

By the way, do you know how to do this one?

(sort the matrix)

before:

a=[3 9 5 7;

3 0 1 2;

11 2 0 9];

after:

a=[11 9 9 7;

5 3 3 2;

2 1 0 0;]

Star Strider 2018-12-2

在 MATLAB Online 中打开

Yes!

a=[ 3 9 5 7;
    3 0 1 2;
   11 2 0 9];
a_after = reshape(sort(a(:),'descend'), 4, [])'
a_after =
    11     9     9     7
     5     3     3     2
     2     1     0     0