Assignment and accessing using indices
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I had a question about how to do a particular type of assignment using indices. The code below is a simplified example.
k = zeros(4,4);
v = [2,3];
k(v,v) = 1;
My intention was to get a result that looks like
ans =
[0, 0, 0, 0;
0, 1, 0, 0;
0, 0, 1, 0;
0, 0, 0, 0]
But unfortunately the result is:
ans =
[0, 0, 0, 0;
0, 1, 1, 0;
0, 1, 1, 0;
0, 0, 0, 0]
So my question is: Is there a way to access individual elements (rather than rectangular regions) without using a for loop (Which I understand is computationally expensive in MatLab)?
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更多回答（2 个）
John BG
2016-6-6
Chad Greene
2016-6-5
Try this:
A = zeros(4);
lin = sub2ind([4 4],2:3,2:3);
A(lin) = 1;
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