From: Emanuel Berg <incal@dataswamp.org>
To: emacs-devel@gnu.org
Subject: Re: Adding a generic mathematical library
Date: Wed, 17 Jul 2024 00:06:49 +0200 [thread overview]
Message-ID: <878qy1at52.fsf@dataswamp.org> (raw)
In-Reply-To: 87le21qldj.fsf_-_@posteo.net
Philip Kaludercic wrote:
>> Someone™ should propose a concrete suggestion.
>
> I've rename the thread to get some more attention, and also
> wanted to mention, that if we do so, I think putting some
> thought into the design wouldn't be bad. Including an
> infix-notation macro and perhaps even overloaded operator
> support ala APL would be a nice thing to have. We'd have to
> weigh the cost of this kind of flexibility with performance,
> unless someone were to write a specialised byte-compiler.
Yeah, I've pushed for a math library for a long time.
I have several files that are very close to that (for stats,
time, permutations and so on) but I also have a math.el which
I yank below if any of it can be used.
I'd love to stay in the loop and read more on this!
;;; -*- lexical-binding: t -*-
;;
;; this file:
;; https://dataswamp.org/~incal/emacs-init/math.el
(require 'cl-lib)
(require 'dwim) ; https://dataswamp.org/~incal/emacs-init/dwim.el
(require 'perm) ; https://dataswamp.org/~incal/emacs-init/perm.el
(defun nand (&rest conditions)
(when (member nil conditions)
t) )
;; (nand) ; nil
;; (nand 1 2 3) ; nil
;; (nand nil) ; t
;; (nand 1 2 nil 3) ; t
;; (not (and)) ; nil
;; (not (and 1 2 3)) ; nil
;; (not (and nil)) ; t
;; (not (and 1 2 nil 3)) ; t
(defalias '** #'expt)
(defalias 'ceil #'ceiling)
(defun percent-change (from to)
(if (= from to)
0
(/ (- to from) (abs from) 0.01)))
;; (percent-change 1 2) ; 100
;; (percent-change 1 1) ; 0
;; (percent-change 1 0) ; -100
;; (percent-change 1 -1) ; -200
;;
;; (percent-change 0 1) ; 1.0e+INF
;; (percent-change 0 0) ; 0
;; (percent-change 0 -1) ; -1.0e+INF
;;
;; (percent-change -1 1) ; 200
;; (percent-change -1 0) ; 100
;; (percent-change -1 -1) ; 0
;; (percent-change -1 -2) ; -100
(defun distance-point (min max)
(+ min (/ (- max min) 2.0)) )
;; (distance-point 1 5) ; 3
;; (distance-point 1 10) ; 5.5
;; (distance-point 60 100) ; 80
(defun // (nom denom)
(/ nom denom 1.0) )
;; (/ 8 256) ; 0
;; (// 8 256) ; 0.03125
(defun arith-sum (n)
(cl-loop
with sum = 0
for i from 1 to (1- n)
do (cl-incf sum i)
finally return sum) )
(defun digs (n)
(* n (1- n)) )
(defun mean-value (vs)
(let*((sum (apply #'+ vs))
(mean (/ sum (length vs) 1.0)) )
mean) )
(defun mean-str (strs)
(mean-value (cl-map 'list #'length strs)) )
(defun faster (old new)
(format "%.1f%%" (* 100 (1- (/ new old 1.0)))) )
;; (faster 0.2 0.5) ; 150.0%
;; (faster 1.35 0.84) ; -37.8%
;; (faster 200 400) ; 100.0%
;; (faster 1000 1000) ; 0.0%
;; (faster 1000 100) ; -90.0%
(defun percent (nom &optional denom str)
(or denom (setq denom 1))
(let ((perc (/ nom denom 0.01)))
(if str
(format "%.1f%%" perc)
perc)))
;; (percent 0.25) ; 25.0
;; (percent 50 75) ; 66.66 ...
;; (percent (// 1 2) nil t) ; 50.0%
;; (percent 1019 22 t) ; 4631.8%
(let ((min-def 0)
(max-def 9)
(inc-def 1) )
(defun interval (&optional min max inc)
(interactive `(,(read-number "min: " min-def)
,(read-number "max: " max-def)
,(read-number "inc: " inc-def)) )
(or min (setq min min-def))
(or max (setq max max-def))
(or inc (setq inc inc-def))
(unless (<= min max)
(error "Bogus interval") )
(unless (> inc 0)
(error "Bogus increment") )
(cl-loop
for i from min to max by inc
collect i) )
(declare-function interval nil) )
;; (interval 10 5) ; Bogus interval
;; (interval 1 3 -1) ; Bogus increment
;; (interval 5 10) ; (5 6 7 8 9 10)
;; (interval 1.8 2.0 0.1) ; (1.8 1.9 2.0)
;; (interval) ; (0 1 2 3 4 5 6 7 8 9)
;; (interval 19 99) ; (19 20 21 ... 97 98 99)
(defun digits-sum (&optional beg end)
(interactive (use-region))
(or beg (setq beg (point-min)))
(or end (setq end (point-max)))
(let ((sum 0))
(goto-char beg)
(while (re-search-forward " [[:digit:].]+ " end t)
(cl-incf sum (string-to-number (match-string-no-properties 0))) )
(prog1
sum
(message "sum: %.1f" sum) )))
(defalias 'di #'digits-sum)
(defun film-mean ()
(interactive)
(let ((scores)
(beg (point-min))
(end (point-max)) )
(save-excursion
(goto-char beg)
(while (re-search-forward "[[:digit:]]" end t)
(when (= (current-column) 73)
(push (string-to-number (match-string-no-properties 0)) scores) )))
(when scores
(message (format "%.3f" (mean-value scores))) )))
(defun positive-integer-p (n)
(and
(integerp n)
(< 0 n) ))
;; (positive-integer-p 1.5) ; nil
;; (positive-integer-p 1) ; t
;; (positive-integer-p 0) ; nil
;; (positive-integer-p -1) ; nil
(defun string-to-number-number (str)
(let ((s (string-trim str)))
(when (string-match-p
"\\`[+-]?\\([[:digit:]]+\\|[[:digit:]]*\\.[[:digit:]]+\\)\\'" s)
(string-to-number s) )))
(defun string-to-number-number-test ()
(cl-map 'list (lambda (e)
(pcase-let ((`(,a ,b) e))
(if (and a b)
(= a b)
(eq a b) )))
(list
(list (string-to-number-number " 10") 10)
(list (string-to-number-number " 1.5") 1.5)
(list (string-to-number-number " +0") 0)
(list (string-to-number-number " 0") 0)
(list (string-to-number-number " -0.0") -0.0)
(list (string-to-number-number " -1.5") -1.5)
(list (string-to-number-number "-10") -10)
(list (string-to-number-number "123this used to work") nil)
(list (string-to-number-number "NAN") nil) )))
;; (string-to-number-number-test)
(defun read-integer ()
(let ((str)
(str-number)
(n) )
(cl-loop until (progn
(setq str (read-string "integer: "))
(if (string= str "0")
(setq n 0)
(setq str-number (string-to-number str))
(unless (= str-number 0)
(setq n str-number) ))
(integerp n)) )
n) )
;; (read-integer)
(defun compare (old new)
(format "%.2f%%" (* 100 (/ (- old new)
(* old 1.0) ))))
;; (compare 185 80) ; 56.76%
(defun hypotenuse (c1 c2)
(sqrt (+ (* c1 c1) (* c2 c2))) )
(defun speed (hour minute second km)
(let*((s (+ second (* 60 minute) (* 60 60 hour)))
(m (* 1000 km))
(mps (/ m s)) )
(* 3.6 mps) ))
;; (speed 04 44 10 42.195) ; 8.909208211143694
;; (speed 02 01 39 42.195) ; 20.811344019728732
;; (speed 19 04 00 168 ) ; 7.2
(defun binom (n k)
(/ (cl-factorial n)
(* (cl-factorial k)
(cl-factorial (- n k)) )))
(defun product (l)
(cl-loop with prod = 1
for i in l do
(setq prod (* prod i))
finally return prod) )
;; (product '(1 2 3 4)) ; 24
(defun tau-ceti (speed)
(let*((dist (* 11.8 9.46 (expt 10 12)))
(time (/ dist speed) )
(days (/ time 24))
(whole-days (round days)) )
(format-seconds "%y years"
(- (float-time (encode-time 0 0 0 whole-days 0 0))
(float-time (encode-time 0 0 0 0 0 0)) ))))
;; (tau-ceti 5000) ; 2 548 584 years
(provide 'math)
--
underground experts united
https://dataswamp.org/~incal
next prev parent reply other threads:[~2024-07-16 22:06 UTC|newest]
Thread overview: 127+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-12 16:47 Add elisa to GNU ELPA Sergey Kostyaev
2024-07-16 12:54 ` Philip Kaludercic
2024-07-16 13:57 ` Sergey Kostyaev
2024-07-16 16:04 ` Philip Kaludercic
2024-07-16 16:35 ` Sergey Kostyaev
2024-07-17 13:21 ` Andrew Hyatt
2024-07-16 16:41 ` Sergey Kostyaev
2024-07-16 17:02 ` Philip Kaludercic
2024-07-16 17:47 ` Adding a generic mathematical library Philip Kaludercic
2024-07-16 22:06 ` Emanuel Berg [this message]
2024-07-17 2:54 ` Christopher Dimech
2024-07-17 5:58 ` Emanuel Berg
2024-07-19 16:16 ` Richard Stallman
2024-07-19 17:38 ` Christopher Dimech
2024-07-21 5:20 ` Emanuel Berg
2024-07-20 12:45 ` Max Nikulin
2024-07-20 13:53 ` Christopher Dimech
2024-07-21 5:19 ` Emanuel Berg
2024-07-21 6:15 ` Emanuel Berg
2024-07-21 7:40 ` Emanuel Berg
2024-07-21 8:45 ` Emanuel Berg
2024-07-21 8:29 ` Emanuel Berg
2024-07-21 7:27 ` Christopher Dimech
2024-07-21 8:03 ` Emanuel Berg
2024-07-21 9:14 ` Christopher Dimech
2024-07-21 9:48 ` Emanuel Berg
2024-07-21 11:20 ` Emanuel Berg
2024-07-21 11:53 ` Christopher Dimech
2024-07-21 12:10 ` Emanuel Berg
2024-07-21 12:27 ` Emanuel Berg
2024-07-21 12:46 ` Emanuel Berg
2024-07-21 13:03 ` Christopher Dimech
2024-07-21 13:17 ` Emanuel Berg
2024-07-21 14:33 ` Eli Zaretskii
2024-07-21 14:41 ` Christopher Dimech
2024-07-21 14:49 ` Eli Zaretskii
2024-07-21 14:58 ` Christopher Dimech
2024-07-21 15:02 ` Eli Zaretskii
2024-07-21 15:18 ` Christopher Dimech
2024-07-21 13:18 ` Christopher Dimech
2024-07-21 13:26 ` Emanuel Berg
2024-07-21 14:35 ` Christopher Dimech
2024-07-21 19:28 ` Emanuel Berg
2024-07-21 19:33 ` Emanuel Berg
2024-07-21 19:51 ` Emanuel Berg
2024-07-21 20:01 ` Emanuel Berg
2024-07-21 20:17 ` Emanuel Berg
2024-07-21 12:41 ` Christopher Dimech
2024-07-21 13:13 ` Emanuel Berg
2024-07-21 13:41 ` Emanuel Berg
2024-07-21 12:20 ` Emanuel Berg
2024-07-21 12:04 ` Emanuel Berg
2024-07-21 14:30 ` hypotenuse (was: Re: Adding a generic mathematical library) Emanuel Berg
2024-07-21 14:44 ` Eli Zaretskii
2024-07-21 15:00 ` Eli Zaretskii
2024-07-21 15:12 ` Christopher Dimech
2024-07-21 15:42 ` Eli Zaretskii
2024-07-21 16:13 ` Christopher Dimech
2024-07-21 15:54 ` hypotenuse Max Nikulin
2024-07-21 16:12 ` hypotenuse Eli Zaretskii
2024-07-21 16:17 ` hypotenuse Christopher Dimech
2024-07-21 19:01 ` hypotenuse (was: Re: Adding a generic mathematical library) Emanuel Berg
2024-07-21 19:13 ` Emanuel Berg
2024-07-21 17:38 ` tomas
2024-07-17 7:09 ` Adding a generic mathematical library Michael Heerdegen via Emacs development discussions.
2024-07-17 7:54 ` Philip Kaludercic
2024-07-17 7:56 ` Michael Heerdegen via Emacs development discussions.
2024-07-18 6:07 ` Emanuel Berg
2024-07-18 6:45 ` Christopher Dimech
2024-07-18 7:12 ` Emanuel Berg
2024-07-18 7:49 ` Christopher Dimech
2024-07-21 4:56 ` Emanuel Berg
2024-07-18 7:29 ` Eli Zaretskii
2024-07-18 7:57 ` Emanuel Berg
2024-07-18 9:03 ` Eli Zaretskii
2024-07-21 4:52 ` Emanuel Berg
2024-07-18 8:15 ` Emanuel Berg
2024-07-18 9:04 ` Eli Zaretskii
2024-07-18 9:13 ` Christopher Dimech
2024-07-21 4:59 ` Emanuel Berg
2024-07-19 13:22 ` Emanuel Berg
2024-07-19 16:12 ` Christopher Dimech
2024-07-19 16:15 ` Stefan Kangas
2024-07-19 16:29 ` Christopher Dimech
2024-07-19 16:16 ` Richard Stallman
2024-07-19 18:00 ` Christopher Dimech
2024-07-17 21:26 ` Add elisa to GNU ELPA Sergey Kostyaev
2024-07-17 22:12 ` Philip Kaludercic
2024-07-18 3:45 ` Sergey Kostyaev
2024-07-18 11:06 ` Sergey Kostyaev
-- strict thread matches above, loose matches on Subject: below --
2024-07-23 20:00 Adding a generic mathematical library Kepa
2024-07-25 4:19 ` Emanuel Berg
2024-07-25 11:32 ` Christopher Dimech
2024-07-25 14:20 ` Stefan Kangas
2024-07-25 15:16 ` T.V Raman
2024-07-25 15:34 ` Christopher Dimech
2024-07-25 17:12 ` Emanuel Berg
2024-07-25 17:25 ` Emanuel Berg
2024-07-25 14:24 ` Emanuel Berg
2024-07-25 15:49 ` Christopher Dimech
2024-07-25 17:23 ` Emanuel Berg
2024-07-27 14:57 Shouran Ma
2024-07-27 15:49 ` Emanuel Berg
2024-07-27 19:07 Shouran Ma
2024-07-27 19:23 ` Christopher Dimech
2024-07-28 0:29 ` Emanuel Berg
2024-07-28 10:58 ` Christopher Dimech
2024-07-28 11:39 ` Emanuel Berg
2024-07-28 12:28 ` Christopher Dimech
2024-07-28 13:02 ` Emanuel Berg
2024-07-30 2:53 ` Richard Stallman
2024-07-30 3:53 ` Emanuel Berg
2024-07-30 6:26 ` Christopher Dimech
2024-07-30 7:20 ` Emanuel Berg
2024-07-30 11:30 ` Christopher Dimech
2024-07-30 22:56 ` Emanuel Berg
2024-07-31 16:00 ` Michael Heerdegen via Emacs development discussions.
2024-07-31 21:15 ` Emanuel Berg
2024-08-01 6:05 ` Eli Zaretskii
2024-08-01 6:42 ` Emanuel Berg
2024-07-31 21:26 ` Emanuel Berg
2024-07-27 19:40 ` Christopher Dimech
2024-07-28 0:24 ` Emanuel Berg
2024-07-28 13:34 ` Immanuel Litzroth
2024-07-28 13:56 ` Christopher Dimech
2024-07-28 14:07 ` Emanuel Berg
2024-07-28 10:46 ` Emanuel Berg
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