在尝试选择推荐的索引方法时,我试图测量性能。然而,这些测量结果让我很困惑。我以不同的顺序运行了多次,但测量结果仍然一致。下面是我测量性能的方法: x = round(rand(N,1)*5)-2; idx2 = abs(x)>0;
for t = 1:5000 end for t = 1:5000
idx2 = abs(x)>0
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