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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 
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Random number generation in Julia uses the Xoshiro256++ algorithm by default, with per- Task state. Other RNG types can be plugged in by inheriting the AbstractRNG type; they can then be used to obtain multiple streams of random numbers.
In Julia, you can set a seed to the random number generator using the srand() function. The code example below sets the seed to 1234. Generating a random variable with rand(1) after setting the seed to 1234 will always generate the same number, i.e. it will always return 0.5908446386657102.
To create a random integer number between two values (range), you can use the following formula: SELECT FLOOR(RAND()*(b-a+1))+a; Where a is the smallest number and b is the largest number that you want to generate a random number for.
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.
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