Julia for Data Analysis

Appendix B Solutions to exercises

Exercise 3.1

Create an x variable that is a range of values from 1 to 10^6. Now, using the collect function, create a y vector holding the same values as the x range. Using the @btime macro, check the time of sorting x and y by using the sort function. Finally, using the @edit macro, check the implementation of the sort function that would be invoked when you sort the x range.

Solution

julia> using BenchmarkTools
 
julia> x = 1:10^6;
 
julia> y = collect(x);
 
julia> @btime sort($x);
  1.100 ns (0 allocations: 0 bytes)
 
julia> @btime sort($y);
  7.107 ms (2 allocations: 7.63 MiB)
 
julia> @edit sort(x)

Observe that sorting the x range is much faster than sorting the y vector. If you have a properly configured Julia environment ...