insert ones at given position of matrix

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Phillip
Phillip 2017-12-4
评论： Phillip 2017-12-4
I'm stuck on this probably very simple thing - I have this matrix:
rd = zeros(4, 6);
and x is meant to be the position I would like to insert a 1:
x = [3 1 3 1 1 1];
to obtain this:
0 1 0 1 1 1;
0 0 0 0 0 0;
1 0 1 0 0 0;
0 0 0 0 0 0;
Would anybody please be able to help?

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Stephen23
Stephen23 2017-12-4
编辑：Stephen23 2017-12-4
Use sub2ind:
>> rd = zeros(4,6);
>> x = [3,1,3,1,1,1];
>> rd(sub2ind(size(rd),x,1:numel(x))) = 1
rd =
0 1 0 1 1 1
0 0 0 0 0 0
1 0 1 0 0 0
0 0 0 0 0 0

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