# Find a random position in a vector where the value is zero

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Murali Krishna AG 2021년 7월 25일
편집: Scott MacKenzie 2021년 7월 25일
I have a vector with mix of complex numbers and zeros. I have to find a random position in the vector where the value is zero.
For example, in the given A matrix I should get any of the underlined value's vector position
A = [a b c 0 x 0 0 0 r 0 0 0 y q 0 p 0];

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### 채택된 답변

Scott MacKenzie 2021년 7월 25일
편집: Scott MacKenzie 2021년 7월 25일
% test data (includes zeros and imaginary numbers)
A = [1i 4/1j 7 0 99 0 0 0 8*1j 0 0 0 8 9 0 -7 0];
% find indices of zeros in A
zeroIdx = find(A==0);
% pick one of the zeros at random (display index)
randomIdx = zeroIdx(randi(length(zeroIdx),1))
randonIdx = 6

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### 추가 답변(1개)

Chunru 2021년 7월 25일
% Generate some randome data with zeros
n = 10;
a = randn(1, n);
k = randperm(n, round(n/2));
a(k) = 0;
a
a = 1×10
0 0 -1.5217 0 -1.5143 -0.0588 0 -0.0439 0 -1.0513
% find zeros
idx = find(a==0);
% randomly pick from idx
pick = randperm(length(idx), 1)
pick = 4
a(idx(pick))
ans = 0

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