创建一个随机真/假数组

问题描述

Here is what I am currently doing:

a = trues(100)
for i in 1:length(a)
   a[i] = rand()>0.5 ? true : false
end

Is there a better (faster) solution?

解决方案

In Julia 0.4 you can write bitrand(100):

julia> bitrand(100)
100-element BitArray{1}:
  true
  true
 false
 false
  true
     ⋮
  true
 false
  true
  true
  true

You can get this using the Compat package in older versions of Julia, or you can use the old name, randbool (same behavior, different name). Simon's answer of rand(Bool,100) works but it gives an Array{Bool} instead of a BitArray – a special data type that stores boolean arrays compactly using only a bit per boolean.

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