Create matrix using the array as index

2021 10 8
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更新时间：2021 10 8
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Hi,
I have an array of 1*2000 double. I want to create matrix of 6*2000 double. so only the index of the value is 1 and the others is zero in each columns.
for example if my array is a=[2 2 1 0 3]
the ouput of of matrix will be same as the image below?
Thank you.

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Rik
Rik 2021-10-8
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Ran in:
You don't even need a loop:
a=[2 2 1 0 3];
ind=a+1;
A=zeros(max(ind),numel(ind));
ind=sub2ind(size(A),ind,1:numel(ind));
A(ind)=1
A = 4×5
0 0 0 1 0 0 0 1 0 0 1 1 0 0 0 0 0 0 0 1

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per isakson
per isakson 2021-10-8
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1 个投票

Ran in:
Try this
M = zeros(5,5);
a = [2,2,1,0,3];
for jj = 1:5
M(a(jj)+1,jj)=1;
end
disp(M)
0 0 0 1 0 0 0 1 0 0 1 1 0 0 0 0 0 0 0 1 0 0 0 0 0

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