mapping between two different matrices

Question

Supriya Gain 2023-4-24

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1952409-mapping-between-two-different-matrices

回答： Kevin Holly 2023-4-24

I have a matrix a=[1 2;3 4;5 6] and i have another matrix b=[1 2 3;1 2 3;1 2 3;1 2 3;1 2 3]. Now I want to map between two matrices in such a way that the first row of matrix 'a' is indicating the first column of matrix 'b'. Like, if I type [1 2], it should show [1;1;1;1;1]. If I type [3 4] it should show [2;2;2;2;2].

How to do that?

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Answer 1

Fangjun Jiang 2023-4-24

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https://ww2.mathworks.cn/matlabcentral/answers/1952409-mapping-between-two-different-matrices#answer_1222284

在 MATLAB Online 中打开

a=[1 2;3 4;5 6];
b=[1 2 3;1 2 3;1 2 3;1 2 3;1 2 3];
c=[1 2];
[~,index]=ismember(c,a,'rows');
b(:,index)
ans = 5×1
     1
     1
     1
     1
     1

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Answer 2

Kevin Holly 2023-4-24

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1952409-mapping-between-two-different-matrices#answer_1222289

在 MATLAB Online 中打开

a=[1 2;3 4;5 6]
a = 3×2
     1     2
     3     4
     5     6
b=[1 2 3;1 2 3;1 2 3;1 2 3;1 2 3]
b = 5×3
     1     2     3
     1     2     3
     1     2     3
     1     2     3
     1     2     3
index = 3;
output = yourmap(a,b,index)
output = 5×1
     2
     2
     2
     2
     2
index = 6;
output = yourmap(a,b,index)
output = 5×1
     3
     3
     3
     3
     3
index = [1 2];
output = yourmap(a,b,index)
output = 5×2
     1     1
     1     1
     1     1
     1     1
     1     1
function output = yourmap(a,b,index)
    
[row,column] = find(a==index);
output = b(:,row);
end