Re: [julia-users] Optimization of simple code

[Stéphane Mottelet]

Thank you, Julia is really worth using it !

S.

Le 24/04/2015 02:36, Andreas Noack a écrit :

Try running it twice. It spends time compiling the function the first time. I get

julia> include("../../Downloads/test.jl")

elapsed time: 0.666072953 seconds (42 MB allocated, 1.12% gc time in 2 pauses with 0 full sweep)

julia> @time test()

elapsed time: 0.014324694 seconds (25 MB allocated, 28.88% gc time in 1 pauses with 0 full sweep)

2015-04-23 19:09 GMT-04:00 Stéphane Mottelet <stephane.motte...@gmail.com <mailto:stephane.motte...@gmail.com>>:

    Hello,

    I am trying to improve the speed of code like this:

    M1_v=(v[17]
    v[104]
    v[149]
    -[v[18]+v[63]+v[103]]
    v[17]
    v[104]
    v[149]
    ...
    -[v[39]+v[41]+v[124]]
    v[38]
    v[125]
    v[127]
    -[v[39]+v[41]+v[124]);

    The attached file (with 1000 repetitions) runs very slowly (0.71s)
    compared to Scilab where it takes only 0.42 s on my machine. Did I
    miss something ?

    Thanks for your help

    S.