From: "Joshua S." <joshsuggs@...>
Date: 2011-04-29T02:37:37+09:00
Subject: Re: float precision

Brian Candler wrote in post #995481:
> Joshua S. wrote in post #995421:
>> Not surprisingly, it's extremely quicker to convert to a string and
>> match a regular expression.
>>
>>       user     system      total        real
>> spf  :  1.560000   0.000000   1.560000 (  1.557252)
>> *100 :  0.320000   0.000000   0.320000 (  0.322573)
>> *.01 :  0.350000   0.000000   0.350000 (  0.343289)
>> regex:  0.000000   0.000000   0.000000 (  0.000019)
>
> You should be suspicious of a result which indicates it's 5 orders of
> magnitude faster.
>
>>   r.report('regex:') {
>>     f4 = float.to_s.match(/(^-?\d+(\.\d{1,2})?)/)[1].to_f
>>   }
>
> Ahem, you forgot the "times.times do...end" loop in the benchmark :-)

Wow. Yea ... scratch that.


      user     system      total        real
spf  :  1.570000   0.000000   1.570000 (  1.569649)
*100 :  0.330000   0.000000   0.330000 (  0.323864)
*.01 :  0.340000   0.000000   0.340000 (  0.342777)
regex:  4.120000   0.010000   4.130000 (  4.127264)

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