In Python, I can create an array of evenly spaced values using
xi2 = np.arange(0, np.sqrt(6), 1e-3)
How do I write this in Julia? I tried,
xi2 = range(0,sqrt(6),step=1e-3)
but this returns 0.0:0.001:2.449
1 Answer
The result, 0.0:0.001:2.449 is indeed a range of evenly spaced values, and can be indexed, sliced, broadcasted on, and generally used just like any other AbstractArray. For example:
julia> xi2 = range(0,sqrt(6),step=1e-3)
0.0:0.001:2.449
julia> xi2[1]
0.0
julia> xi2[100]
0.099
julia> length(xi2)
2450
julia> isa(xi2, AbstractArray)
true
julia> sin.(xi2)
2450-element Vector{Float64}:
0.0
0.0009999998333333417
0.0019999986666669333
0.002999995500002025
⋮
0.6408405168240852
0.6400725224915994
0.6393038880866445
0.6385346143778549
If for any reason you want to turn xi2 into a full Array preemptively, you can do that with collect
julia> collect(xi2)
2450-element Vector{Float64}:
0.0
0.001
0.002
0.003
⋮
2.446
2.447
2.448
2.449
which will "materialize" the range, so to speak. This uses a lot more memory than the Range though, and is less often necessary than you might expect.
