how to replace the element in matrix?

i have a matrix
if true
A = [ 1 5 9 7
3 5 7 8
8 2 4 6 ];
end
now i want to put number 12 in the location of A(2,2)
also i want to put number 13 in the location of A(3,3)
how can i do please help me

 采纳的回答

A(2,2)=12;
A(3,3)=13;

2 个评论

how can i do it with a column
A(:,2)=12;
A(:,3)=13;
A = [ 1 12 13 7
3 12 13 8
8 12 13 6 ];

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