[erlang-questions] Printed list to Erlang function
Hynek Vychodil
vychodil.hynek@REDACTED
Wed Mar 30 20:12:20 CEST 2016
Every time I read a claim about how fast it will be I have urge test it. I
had an idea that constant map in a module could be faster than function
clause co I test it.
I was wrong and RAO is right as usual. Function using function clause seems
to be three times faster than using map.
x clause
+ map
+--------------------------------------------------------------------------+
|xxxxx +++++ +|
|xxxx ++++ |
|xxxx +++ |
|xxxx ++ |
|xxx ++ |
|xxx ++ |
|xx ++ |
|xx ++ |
|xx ++ |
|xx + |
|xx + |
|xx + |
|xx + |
|xx + |
| x + |
| x + |
| x + |
| x + |
| x + |
| x + |
| x + |
| x + |
| x + |
| x + |
| x + |
| + |
| + |
| + |
| + |
| + |
| + |
| + |
| + |
| + |
||A| |
| |_MA_| |
+--------------------------------------------------------------------------+
Dataset: x N=50 CI=95.0000
Statistic Value [ Bias] (Bootstrapped LB‥UB)
Min: 3490.00
1st Qu. 3551.00
Median: 3591.00
3rd Qu. 3679.00
Max: 3945.00
Average: 3630.16 [ 0.137534] ( 3602.82 ‥ 3664.56)
Std. Dev: 113.400 [ -1.81311] ( 90.8425 ‥ 141.539)
Outliers: 0/4 = 4 (μ=3630.30, σ=111.587)
Outlier variance: 0.151802 (moderate)
------
Dataset: + N=50 CI=95.0000
Statistic Value [ Bias] (Bootstrapped LB‥UB)
Min: 1.09500e+4
1st Qu. 1.10160e+4
Median: 1.10400e+4
3rd Qu. 1.11270e+4
Max: 1.28270e+4
Average: 1.11055e+4 [ 0.297998] ( 1.10611e+4 ‥ 1.12491e+4)
Std. Dev: 264.914 [ -31.0673] ( 84.7956 ‥ 582.629)
Outliers: 0/2 = 2 (μ=1.11058e+4, σ=233.847)
Outlier variance: 9.45082e-2 (slight)
Difference at 95.0% confidence
7475.36 ± 80.8533
205.924% ± 2.22726%
(Student's t, pooled s = 203.763)
------
It's about 31 million stopwords_clause:is_stopword/1 per second and 10
million stopwords_map:is_stopword/1 per second.
You can find code in gist
https://gist.github.com/pichi/2d10c93242d5057913d026a607f07dd4
Pichi
On Wed, Mar 30, 2016 at 4:05 AM, Lloyd R. Prentice <lloyd@REDACTED>
wrote:
> Wow! What a cool idea.
>
> Thanks, Richard.
>
> Best wishes,
>
> LRP
>
> Sent from my iPad
>
> > On Mar 29, 2016, at 8:47 PM, "Richard A. O'Keefe" <ok@REDACTED>
> wrote:
> >
> >
> >> On 30/03/16 5:59 am, lloyd@REDACTED wrote:
> >> So, I have a printed list of stop words:
> >>
> >> http://www.ranks.nl/stopwords
> >>
> >> I'd like to turn this list into an Erlang function that I can query---
> >>
> >> stopwords() ->
> >> ["word1", "word2" ... "wordN"].
> >>
> >> is_stopword(Word) ->
> >> List = stopwords(),
> >> lists_member(Word, List).
> > Even if there is some arcane reason why you want the collection of words
> > as a list, I strongly suggest generating
> >
> > is_stopword("a") -> true;
> > is_stopword("about") -> true;
> > ...
> > is_stopword("yourselves") -> true;
> > is_stopword(_) -> false.
> >
> > Open the list of stopwords in vi.
> > :1,$s/^.*$/is_stopword("&") -> true;/
> > :$a
> > is_stopword(_) -> false.
> > <ESC>
> >
> > The Erlang compiler will turn this into a trie, roughly speaking.
> > This will be *dizzyingly* faster than the code you outlined.
> >
> >
> >
> >
> >>
> >> All my efforts so far have evolved into ugly kludges. Seems to me there
> must be an elegant method that I'm overlooking.
> >>
> >> Some kind soul point the way?
> >>
> >> Many thanks,
> >>
> >> LRP
> >>
> >> *********************************************
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> >>
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> >> http://thegospelofashes.com
> >>
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> >> save the lives of millions?
> >>
> >> FREEIN' PANCHO
> >> http://freeinpancho.com
> >>
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> >>
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> >>
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