Selecting multiple array elements

Question

reincornator 2022-7-5

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1754110-selecting-multiple-array-elements

评论： reincornator 2022-7-5

Hi.

n = 10;
A = rand(n);
B = A;
k = [1 1; 2 3; 4 5; 1 8; 8 6];
A(k(1,1),k(1,2))= 1;
A(k(2,1),k(2,2))= 1;
A(k(3,1),k(3,2))= 1;
A(k(4,1),k(4,2))= 1;
A(k(5,1),k(5,2))= 1;
B(k(:,1),k(:,2))=1;
isequal(A,B)
ans = logical
   0

How can I assign a value of 1 to elements from array B with coordinates k using a single command?

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Answer 1

Fangjun Jiang 2022-7-5

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1754110-selecting-multiple-array-elements#answer_1000860

编辑：Fangjun Jiang 2022-7-5

在 MATLAB Online 中打开

n = 10;
A = zeros(n);
B = A;
k = [1 1; 2 3; 4 5; 1 8; 8 6];
A(k(1,1),k(1,2))= 1;
A(k(2,1),k(2,2))= 1;
A(k(3,1),k(3,2))= 1;
A(k(4,1),k(4,2))= 1;
A(k(5,1),k(5,2))= 1
A = 10×10
     1     0     0     0     0     0     0     1     0     0
     0     0     1     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     1     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     1     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
B(sub2ind(size(A),k(:,1),k(:,2)))=1
B = 10×10
     1     0     0     0     0     0     0     1     0     0
     0     0     1     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     1     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     1     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
isequal(A,B)
ans = logical
   1