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integerjuliarandom
M.Puk
M.Puk

Reputation: 812

Julia : generating unique random integer array

I am trying to create 10 element array of unique random integers. However I am unable to create array with unique values. Is there in Julia something like Pythons sample function ?

numbers = zeros(Array(Int64, 10))
rand!(1:100, numbers)

Thanks.

Upvotes: 15

Views: 6294

Answers (3)

python必须死
python必须死

Reputation: 1089

unique(itr[, dim])

Returns an array containing only the unique elements of the iterable itr

unique([rand(1:100) for r in 1:20])[1:10]

Set()

A set is a collection of elements, just like an array or dictionary, with no duplicated elements.

{rand(1:100) for r in 1:20}[1:10]

Upvotes: 1

reschu
reschu

Reputation: 1105

If performance is not an issue (i.e. the sample range isn't too large, or the sample count is close to the sample range), and if you don't want to use an additional package for whatever reason, try:

a = randperm(100)[1:10]

Upvotes: 8

amrods
amrods

Reputation: 2131

There is a sample function in StatsBase:

using StatsBase
a = sample(1:100, 10, replace = false)

This will draw a sample of length 10 from 1:100 without replacement.

Upvotes: 23

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