Selecting multiple array elements

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?

Answer 1

[Fangjun Jiang]

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

[reincornator]

Спасибо.