[Scilab-users] Ways to speed up simple things in Scilab ?

[Samuel Gougeon]

Le 24/04/2015 13:36, Samuel Gougeon a écrit :
> Hello Stephane,
>
> You can speed up by a factor larger than 100 just by calling v once 
> (or 3 times) instead of ~1000, as shown by this test:

Actually, to be more accurate, the right comparative test is the following:

function  test2()
     v  =  rand(172,1);
     p  =  grand(1,839,"unf",1,173)
     // Part 1: 1 call to v()
     tic()
     for  i=1:1000
         m1_v  =  v(p)
     end
     disp(toc())
     
     // Part 2 : 839 calls to v()
     deff("test3()",  "for i=1:1000, M1_v = ["+strcat("v("+string(p)+")")+"], end")
     tic()
     test3()
     disp(toc())
endfunction

In this version, the compilation time used by execstr() is no longer 
taken into account.

The results are still explicit:
-->test2()

     0.016

     0.78

So, a speed-up by ~x 50

Samuel

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