Executing loops efficiently with conditional statements

In this recipe, we want to calculate a sum of the positive entries of a large vector in an efficient way.

Getting ready

Open the Julia console. Make sure that you have the BenchmarkTools.jl package installed. If it is missing you can add it by running the following commands: using Pkg; Pkg.add("BenchmarkTools").

Before we begin, load the required packages and generate the vector over which we will perform a sum:

julia> using Random, BenchmarkTools

julia> Random.seed!(1);

julia> x = randn(10^6);

Notice that we use ; at the end of the expressions to suppress the output of the results.

In the GitHub repository for this recipe, you will find the ...