Generating a random integer in range in Julia
I am migrating from MATLAB to Julia and I am trying to generate a random integer in range 1:n
.
For n < 21
,
rand(r[1:n])
works.
However for n > 20
, for example, rand(r[1:21])
, I get this message:
ERROR: BoundsError() in getindex at range.jl:121
Solution 1:
You can give a range as the first argument to rand
, as in rand(1:n)
:
julia> rand(1:10)
7
julia> rand(1:10,10,10)
10x10 Array{Int64,2}:
10 2 5 8 5 5 3 7 1 3
5 1 4 2 4 4 1 6 6 9
8 1 3 9 4 8 7 8 7 10
3 8 1 5 7 9 7 8 10 7
5 8 5 6 6 2 2 7 4 3
10 4 8 8 10 5 1 10 5 1
6 1 8 1 6 5 7 10 6 10
5 10 2 5 4 5 4 1 3 9
5 4 6 4 4 1 7 8 1 5
10 2 6 4 3 10 7 3 8 7
The first argument to the general rand
function usually gives a "thing to sample from", be it a range of values or a distribution object as defined in Distributions.jl.