2012-01-07 17:41:44 +01:00
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;;
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;; Copyright (C) 2011-2012 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
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;;
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;; This program is free software; you can redistribute it and/or modify it
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;; under the terms of the GNU General Public License as published by the
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;; Free Software Foundation; either version 3, or (at your option) any
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;; later version.
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;;
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program; if not, write to the Free Software Foundation,
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;; Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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(define-module (mu stats)
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:use-module (oop goops)
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:use-module (mu message)
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2012-01-13 00:52:30 +01:00
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:use-module (srfi srfi-1)
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:use-module (ice-9 i18n)
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2012-01-12 23:49:30 +01:00
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:export ( mu:tabulate-messages
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2012-01-13 00:52:30 +01:00
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mu:average-messages
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mu:day-numbers->names
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mu:month-numbers->names))
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2012-01-07 17:41:44 +01:00
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(define* (mu:tabulate-messages func #:optional (expr #t))
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"Execute FUNC for each message matching EXPR, and return an alist
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with maps each result of FUNC to its frequency. FUNC is a function
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takes a <mu-message> instance as its argument. For example, to
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tabulate messages by weekday, one could use:
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(mu:tabulate-messages (lambda(msg) (tm:wday (localtime (date msg)))))."
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(let ((table '()))
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(mu:for-each-message
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(lambda(msg)
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(let* ((val (func msg))
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(old-freq (or (assoc-ref table val) 0)))
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(set! table (assoc-set! table val (1+ old-freq)))))
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expr)
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table))
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(define* (mu:average-messages func #:optional (expr #t))
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"Execute FUNC for each message matching EXPR, and return the average
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value of the results of FUNC. FUNC is a function that takes a
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<mu-message> instance as its argument, and returns some number. For
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example, to get the average message size of messages related to
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icecream: (mu:average (lambda(msg) (size msg)) \"icecream\" ."
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(let ((count 0) (sum 0))
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(mu:for-each-message
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(lambda (msg)
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(set! count (+1 count))
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(set! sum (+ sum (func msg))))
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expr)
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(if (= count 0)
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0
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(exact->inexact (/ sum count)))))
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2012-01-13 00:52:30 +01:00
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;; a list of abbreviated, localized day names
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(define day-names
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(map
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(lambda (num)
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(locale-day-short num))
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(iota 7 1)))
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(define (mu:day-numbers->names table)
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"Convert a list of pairs with the car denoting a day number (0-6)
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into a list of pairs with the car replaced by the corresponding day
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name (abbreviated)."
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(map
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(lambda (pair)
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(cons (list-ref day-names (car pair)) (cdr pair)))
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table))
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;; a list of abbreviated, localized month names
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(define month-names
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(map
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(lambda (num)
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(locale-month-short num))
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(iota 12 1)))
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(define (mu:month-numbers->names table)
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"Convert a list of pairs with the car denoting a month number (0-11)
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into a list of pairs with the car replaced by the corresponding day
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name (abbreviated)."
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(map
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(lambda (pair)
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(cons (list-ref month-names (car pair)) (cdr pair)))
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table))
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