Le 03/23/2016 12:20 PM, Stéphane Mottelet a écrit :
timer();for i=1:1000;sum(a($-n+10:$-n+100000));end;disp(timer())
On a 10-year old pc under linux (ubuntu 14.04):
5.5.2
n=200000;a=rand(n,1); timer();for
i=1:1000;sum(a(10:100000));end;disp(timer());timer();for
i=1:1000;sum(a($-n+10:$-n+100000));end;disp(timer())
2.202731
0.94785
6.0.0
n=200000;a=rand(n,1); timer();for
i=1:1000;sum(a(10:100000));end;disp(timer());timer();for
i=1:1000;sum(a($-n+10:$-n+100000));end;disp(timer())
2.303838
1.430211
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