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Message from discussion Efficient processing of large nuumeric data file
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bearophileh...@lycos.com  
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 More options Jan 18 2008, 7:59 pm
Newsgroups: comp.lang.python
From: bearophileH...@lycos.com
Date: Fri, 18 Jan 2008 16:59:34 -0800 (PST)
Local: Fri, Jan 18 2008 7:59 pm
Subject: Re: Efficient processing of large nuumeric data file
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...and just for fun this D code is about 3.2 times faster than the
Psyco version for the same dataset (30% lines with a space):

import std.stdio, std.conv, std.string, std.stream;

int[int] get_hist(string file_name) {
    int[int] hist;

    foreach(string line; new BufferedFile(file_name)) {
        int pos = find(line, ' ');
        if (pos == -1)
            hist[toInt(line)]++;
        else
            hist[toInt(line[0 .. pos])] += toInt(line[pos+1 .. $]);
    }

    return hist;

}

void main(string[] args) {
    writefln( get_hist(args[1]).length );

}

Bye,
bearophile

 
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