2 1.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.3 Julia Compared to Other Languages . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Getting else. Once you understand how Julia works, it is easy to write code that is nearly as fast as C. 1.3 Julia Compared to Other Languages Julia features optional typing, multiple dispatch, and good performance A = [1.3, -2.7, 4.4, 3.1]; julia> @ccall qsort(A::Ptr{Cdouble}, length(A)::Csize_t, sizeof(eltype(A))::Csize_t, mycompare_c::Ptr{Cvoid})::Cvoid �→ julia> A 4-element Vector{Float64}: -2.7 1.3 3.1

2 1.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.3 Julia Compared to Other Languages . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Getting else. Once you understand how Julia works, it is easy to write code that is nearly as fast as C. 1.3 Julia Compared to Other Languages Julia features optional typing, multiple dispatch, and good performance A = [1.3, -2.7, 4.4, 3.1]; julia> @ccall qsort(A::Ptr{Cdouble}, length(A)::Csize_t, sizeof(eltype(A))::Csize_t, mycompare_c::Ptr{Cvoid})::Cvoid �→ julia> A 4-element Vector{Float64}: -2.7 1.3 3.1

2 1.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.3 Julia Compared to Other Languages . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Getting else. Once you understand how Julia works, it is easy to write code that is nearly as fast as C. 1.3 Julia Compared to Other Languages Julia features optional typing, multiple dispatch, and good performance A = [1.3, -2.7, 4.4, 3.1]; julia> @ccall qsort(A::Ptr{Cdouble}, length(A)::Csize_t, sizeof(eltype(A))::Csize_t, mycompare_c::Ptr{Cvoid})::Cvoid �→ julia> A 4-element Vector{Float64}: -2.7 1.3 3.1

2 1.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.3 Julia Compared to Other Languages . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Getting else. Once you understand how Julia works, it is easy to write code that is nearly as fast as C. 1.3 Julia Compared to Other Languages Julia features optional typing, multiple dispatch, and good performance A = [1.3, -2.7, 4.4, 3.1]; julia> @ccall qsort(A::Ptr{Cdouble}, length(A)::Csize_t, sizeof(eltype(A))::Csize_t, mycompare_c::Ptr{Cvoid})::Cvoid �→ julia> A 4-element Vector{Float64}: -2.7 1.3 3.1

2 1.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.3 Julia Compared to Other Languages . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Getting else. Once you understand how Julia works, it is easy to write code that is nearly as fast as C. 1.3 Julia Compared to Other Languages Julia features optional typing, multiple dispatch, and good performance A = [1.3, -2.7, 4.4, 3.1]; julia> @ccall qsort(A::Ptr{Cdouble}, length(A)::Csize_t, sizeof(eltype(A))::Csize_t, mycompare_c::Ptr{Cvoid})::Cvoid �→ julia> A 4-element Vector{Float64}: -2.7 1.3 3.1

2 1.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.3 Julia Compared to Other Languages . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Getting else. Once you understand how Julia works, it is easy to write code that is nearly as fast as C. 1.3 Julia Compared to Other Languages Julia features optional typing, multiple dispatch, and good performance A = [1.3, -2.7, 4.4, 3.1]; julia> @ccall qsort(A::Ptr{Cdouble}, length(A)::Csize_t, sizeof(eltype(A))::Csize_t, mycompare_c::Ptr{Cvoid})::Cvoid �→ julia> A 4-element Vector{Float64}: -2.7 1.3 3.1

2 1.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.3 Julia Compared to Other Languages . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Getting else. Once you understand how Julia works, it is easy to write code that is nearly as fast as C. 1.3 Julia Compared to Other Languages Julia features optional typing, multiple dispatch, and good performance A = [1.3, -2.7, 4.4, 3.1]; julia> @ccall qsort(A::Ptr{Cdouble}, length(A)::Csize_t, sizeof(eltype(A))::Csize_t, mycompare_c::Ptr{Cvoid})::Cvoid �→ julia> A 4-element Vector{Float64}: -2.7 1.3 3.1

2 1.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.3 Julia Compared to Other Languages . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Getting else. Once you understand how Julia works, it is easy to write code that is nearly as fast as C. 1.3 Julia Compared to Other Languages Julia features optional typing, multiple dispatch, and good performance A = [1.3, -2.7, 4.4, 3.1]; julia> @ccall qsort(A::Ptr{Cdouble}, length(A)::Csize_t, sizeof(eltype(A))::Csize_t, mycompare_c::Ptr{Cvoid})::Cvoid �→ julia> A 4-element Vector{Float64}: -2.7 1.3 3.1

2 1.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.3 Julia Compared to Other Languages . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Getting else. Once you understand how Julia works, it is easy to write code that is nearly as fast as C. 1.3 Julia Compared to Other Languages Julia features optional typing, multiple dispatch, and good performance A = [1.3, -2.7, 4.4, 3.1]; julia> @ccall qsort(A::Ptr{Cdouble}, length(A)::Csize_t, sizeof(eltype(A))::Csize_t, mycompare_c::Ptr{Cvoid})::Cvoid �→ julia> A 4-element Vector{Float64}: -2.7 1.3 3.1

2 1.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.3 Julia Compared to Other Languages . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Getting else. Once you understand how Julia works, it is easy to write code that is nearly as fast as C. 1.3 Julia Compared to Other Languages Julia features optional typing, multiple dispatch, and good performance A = [1.3, -2.7, 4.4, 3.1]; julia> @ccall qsort(A::Ptr{Cdouble}, length(A)::Csize_t, sizeof(eltype(A))::Csize_t, mycompare_c::Ptr{Cvoid})::Cvoid �→ julia> A 4-element Vector{Float64}: -2.7 1.3 3.1