<div dir="ltr">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.<div><br></div><div>I was wrong and RAO is right as usual. Function using function clause seems to be three times faster than using map.</div><div><br></div><div><div>x clause</div><div>+ map</div><div>+--------------------------------------------------------------------------+</div><div>|xxxxx                                                     +++++          +|</div><div>|xxxx                                                      ++++            |</div><div>|xxxx                                                      +++             |</div><div>|xxxx                                                       ++             |</div><div>|xxx                                                        ++             |</div><div>|xxx                                                        ++             |</div><div>|xx                                                         ++             |</div><div>|xx                                                         ++             |</div><div>|xx                                                         ++             |</div><div>|xx                                                         +              |</div><div>|xx                                                         +              |</div><div>|xx                                                         +              |</div><div>|xx                                                         +              |</div><div>|xx                                                         +              |</div><div>| x                                                         +              |</div><div>| x                                                         +              |</div><div>| x                                                         +              |</div><div>| x                                                         +              |</div><div>| x                                                         +              |</div><div>| x                                                         +              |</div><div>| x                                                         +              |</div><div>| x                                                         +              |</div><div>| x                                                         +              |</div><div>| x                                                         +              |</div><div>| x                                                         +              |</div><div>|                                                           +              |</div><div>|                                                           +              |</div><div>|                                                           +              |</div><div>|                                                           +              |</div><div>|                                                           +              |</div><div>|                                                           +              |</div><div>|                                                           +              |</div><div>|                                                           +              |</div><div>|                                                           +              |</div><div>||A|                                                                       |</div><div>|                                                         |_MA_|           |</div><div>+--------------------------------------------------------------------------+</div><div>Dataset: x N=50 CI=95.0000</div><div>Statistic     Value     [         Bias] (Bootstrapped LB‥UB)</div><div>Min:            3490.00</div><div>1st Qu.         3551.00</div><div>Median:         3591.00</div><div>3rd Qu.         3679.00</div><div>Max:            3945.00</div><div>Average:        3630.16 [     0.137534] (      3602.82 ‥       3664.56)</div><div>Std. Dev:       113.400 [     -1.81311] (      90.8425 ‥       141.539)</div><div><br></div><div>Outliers: 0/4 = 4 (μ=3630.30, σ=111.587)</div><div>        Outlier variance:      0.151802 (moderate)</div><div><br></div><div>------</div><div><br></div><div>Dataset: + N=50 CI=95.0000</div><div>Statistic     Value     [         Bias] (Bootstrapped LB‥UB)</div><div>Min:         1.09500e+4</div><div>1st Qu.      1.10160e+4</div><div>Median:      1.10400e+4</div><div>3rd Qu.      1.11270e+4</div><div>Max:         1.28270e+4</div><div>Average:     1.11055e+4 [     0.297998] (   1.10611e+4 ‥    1.12491e+4)</div><div>Std. Dev:       264.914 [     -31.0673] (      84.7956 ‥       582.629)</div><div><br></div><div>Outliers: 0/2 = 2 (μ=1.11058e+4, σ=233.847)</div><div>        Outlier variance:    9.45082e-2 (slight)</div><div><br></div><div>Difference at 95.0% confidence</div><div>        7475.36 ± 80.8533</div><div>        205.924% ± 2.22726%</div><div>        (Student's t, pooled s = 203.763)</div><div>------</div><div><br></div><div>It's about 31 million stopwords_clause:is_stopword/1 per second and 10 million stopwords_map:is_stopword/1 per second.</div><div><br></div><div>You can find code in gist <a href="https://gist.github.com/pichi/2d10c93242d5057913d026a607f07dd4">https://gist.github.com/pichi/2d10c93242d5057913d026a607f07dd4</a></div><div><br></div><div>Pichi</div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Mar 30, 2016 at 4:05 AM, Lloyd R. Prentice <span dir="ltr"><<a href="mailto:lloyd@writersglen.com" target="_blank">lloyd@writersglen.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex">Wow! What a cool idea.<br>
<br>
Thanks, Richard.<br>
<br>
Best wishes,<br>
<br>
LRP<br>
<br>
Sent from my iPad<br>
<br>
> On Mar 29, 2016, at 8:47 PM, "Richard A. O'Keefe" <<a href="mailto:ok@cs.otago.ac.nz">ok@cs.otago.ac.nz</a>> wrote:<br>
<span class="">><br>
><br>
>> On 30/03/16 5:59 am, <a href="mailto:lloyd@writersglen.com">lloyd@writersglen.com</a> wrote:<br>
>> So, I have a printed list of stop words:<br>
>><br>
>> <a href="http://www.ranks.nl/stopwords" rel="noreferrer" target="_blank">http://www.ranks.nl/stopwords</a><br>
>><br>
>> I'd like to turn this list into an Erlang function that I can query---<br>
>><br>
>> stopwords() -><br>
>>    ["word1", "word2" ... "wordN"].<br>
>><br>
>> is_stopword(Word) -><br>
>>    List = stopwords(),<br>
>>    lists_member(Word, List).<br>
</span>> Even if there is some arcane reason why you want the collection of words<br>
> as a list, I strongly suggest generating<br>
><br>
> is_stopword("a") -> true;<br>
> is_stopword("about") -> true;<br>
> ...<br>
> is_stopword("yourselves") -> true;<br>
> is_stopword(_) -> false.<br>
><br>
> Open the list of stopwords in vi.<br>
> :1,$s/^.*$/is_stopword("&") -> true;/<br>
> :$a<br>
> is_stopword(_) -> false.<br>
> <ESC><br>
><br>
> The Erlang compiler will turn this into a trie, roughly speaking.<br>
> This will be *dizzyingly* faster than the code you outlined.<br>
<div class=""><div class="h5">><br>
><br>
><br>
><br>
>><br>
>> All my efforts so far have evolved into ugly kludges. Seems to me there must be an elegant method that I'm overlooking.<br>
>><br>
>> Some kind soul point the way?<br>
>><br>
>> Many thanks,<br>
>><br>
>> LRP<br>
>><br>
>> *********************************************<br>
>> My books:<br>
>><br>
>> THE GOSPEL OF ASHES<br>
>> <a href="http://thegospelofashes.com" rel="noreferrer" target="_blank">http://thegospelofashes.com</a><br>
>><br>
>> Strength is not enough. Do they have the courage<br>
>> and the cunning? Can they survive long enough to<br>
>> save the lives of millions?<br>
>><br>
>> FREEIN' PANCHO<br>
>> <a href="http://freeinpancho.com" rel="noreferrer" target="_blank">http://freeinpancho.com</a><br>
>><br>
>> A community of misfits help a troubled boy find his way<br>
>><br>
>> AYA TAKEO<br>
>> <a href="http://ayatakeo.com" rel="noreferrer" target="_blank">http://ayatakeo.com</a><br>
>><br>
>> Star-crossed love, war and power in an alternative<br>
>> universe<br>
>><br>
>> Available through Amazon or by request from your<br>
>> favorite bookstore<br>
>><br>
>><br>
>> **********************************************<br>
>><br>
>> _______________________________________________<br>
>> erlang-questions mailing list<br>
>> <a href="mailto:erlang-questions@erlang.org">erlang-questions@erlang.org</a><br>
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><br>
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</div></div></blockquote></div><br></div></div></div>