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Create a logical matrix from numerical vector

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YT
YT 2017-12-18
评论： YT 2017-12-18
Maybe the title sounds vague, but I'll try to explain. I have the following vector of size samples-by-1 that contains the numerical values between 0 and 9 (10 values):
V = [3;5;1;2;6;9;7;8;4;0]
Now I want to create a 'logical' matrix from this. So like this:
0 1 2 3 4 5 6 7 8 9
M = [0 0 0 1 0 0 0 0 0 0;
0 0 0 0 0 1 0 0 0 0;
0 1 0 0 0 0 0 0 0 0;
0 0 1 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 1;
0 0 0 0 0 0 0 1 0 0;
0 0 0 0 0 0 0 0 1 0;
0 0 0 0 1 0 0 0 0 0;
1 0 0 0 0 0 0 0 0 0]
What's the easiest way to achieve this?

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Walter Roberson
Walter Roberson 2017-12-18
https://www.mathworks.com/help/nnet/ref/ind2vec.html
full( ind2vec(V+1).' )
or,
accumarray((1:length(V)).', V+1)
or
maxV = max(V);
LV = length(V);
M = zeros(LV, maxV+1);
M(V * LV + (1:LV).') = 1;
or
maxV = max(V);
LV = length(V);
M = zeros(LV, maxV+1);
M( sub2ind(size(M), (1:LV).', V+1) ) = 1;
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