Re: [boost] different matrix library?

Subject: Re: [boost] different matrix library?
From: Edward Grace (ej.grace_at_[hidden])
Date: 2009-08-18 14:47:45

> Timing at a nominal precision of 0.4%: We cannot distinguish between A
> and B:  (-2.22045e-14 [1.9685] 4.51977)%
> Timing at a nominal precision of 0.08%: We cannot distinguish  
> between A
> and B:  (-5.22489 [0.0530135] 4.15175)%
>
> So what does this means ?

It means what it says, for the two functions you are timing there is  
no measurable difference in execution time that cannot be explained  
by chance.

So, if you think A is faster than B or B is faster than A, you are  
mistaken.

The final figure for example, -5.22 --- +4.15, indicates that with a  
95% chance the speedup of A relative to B lies between those  
extremes.  Since these extremes clearly include zero you can't say  
there is a speedup.  The best point estimate of the speedup is 0.053%  
(naff all!).

-ed
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"No more boom and bust." -- Dr. J. G. Brown, 1997