random vector containing zero and values

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meh alipoo
meh alipoo 2016-11-15
评论： meh alipoo 2016-11-15
I have an problem: I have a vector A with size N; I want to fill it up with a random vector with values from [1 randi(N)] while the other elements of A be zero. for example:
N = 6;
A(1:6)=0;
b = randi(N);
C =randperm(b);
now without any loop assign each element of C to the random positions of A while the other un-assigned elements of A remain zero if b<N;

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采纳的回答

Adam
Adam 2016-11-15
a = zeros(1,6);
n = 6;
b = randi(n);
c = 1:b;
a( randperm( numel(a), b ) ) = c;

更多回答（1 个）

Alexandra Harkai
Alexandra Harkai 2016-11-15
A(1:6)=0;
N = 6;
b = randi(N);
C =(1:b);
A_idx = randperm(N, b); % generate b random integers from 1 to N
C_idx = randperm(b); % generate a random permutation of integers from 1 to b
A(A_idx) = C(C_idx); % assign values according to the indices
  2 个评论
Alexandra Harkai
Alexandra Harkai 2016-11-15
I realised I over-complicated this by making it random in A and C, but there's no need to. :)

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