# choose some random number from the given number matlab

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Arul prasath on 28 Jul 2014
Edited: Patrik Ek on 28 Jul 2014
a=[0.1,0.1,0.1,0.2,0.3];
from this i want to choose some random number
Note: answer may be like "a=0.1,0.2"

Patrik Ek on 28 Jul 2014
Edited: Patrik Ek on 28 Jul 2014
Ok, I assume that the example "a=[1 1 2 4 5 1 1 1]; than the answer should be b= 1 3 1" had a typo and that you want to randomly select a number of samples from a vector a. This is how I normally do it.
a=[0.1,0.1,0.1,0.2,0.3];
nSamples = 3;
tmp = rand(size(a));
[~,idx] = sort(tmp);
idx = idx(1:nSamples);
b = a(idx);
clear tmp;
This creates a vector of randomly generated numbers, from an uniform distribution and when sorted, the random numbers will be linearly increasing and the original indices will be uniformly distributed.
Arul prasath on 28 Jul 2014
wow nice thank you

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